Omron S8AS User Manual

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S8AS

Smart Power Supply

USER'S MANUAL

Cat. No. Z269-E1-05

S8AS Smart Power Supply

User’s Manual

Revised September 2013

About this Manual:

This manual describes the installation and operation of the S8AS Smart Power Supply and includes the sections described below.

Please read this manual carefully and be sure you understand the information provided before attempting to install or operate the S8AS Smart Power Supply. Be sure to read the precautions provided in the following section.

Precautions provides general precautions for using the S8AS Smart Power Supply and related devices.

Section 1 introduces the features and functions of the S8AS Smart Power Supply and concepts related to its operation.

Section 2 identifies the S8AS Smart Power Supply’s components, provides specifications, and describes the basic functions.

Section 3 describes how to install and wire the S8AS Smart Powe r Supply. Section 4 describes how to set the S8AS’s various parameters. Section 5 describes how to connect the branch outputs and test operation. Section 6 describes how to use S8AS communications. Section 7 provides information on troubleshooting problems that may occur with the S8AS Smart

Power Supply. The appendices provide a glossary of terms related to the S8AS and flowcharts of S8AS key opera-

tions.

! W ARNING Failure to read and understand the information provided in this manual may result in per-

sonal injury or death, damage to the Product, or Product failure. Please read each section in its entirety and be sure you understand the information provided in the section and related sections before attempting any of the procedures or operations given.

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TABLE OF CONTENTS

SECTION 1

Features and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1-1 Overview of Features and Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1-2 S8AS Operating Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

1-3 Table of Basic Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1-4 S8AS Operating Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

SECTION 2

Specifications and Functions . . . . . . . . . . . . . . . . . . . . . . . . . 15

2-1 Component Names and Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2-2 Internal Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2-3 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

2-4 Basic Function Details. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2-5 Startup Sequence Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

2-6 Shutdown Sequence Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

2-7 External Tripping Input Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

SECTION 3

Installation and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

3-1 Installing the S8AS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

3-2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

3-3 Power Supply and Input/Output Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

3-4 RS-485 Port Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

SECTION 4

Parameter Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

4-1 Parameter Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

4-2 Switching the Operating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

4-3 Changing the Protection Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

4-4 Switching to Setting Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

4-5 Individual Branch Output Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

4-6 Shared Parameter Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

4-7 Special Settings and Communications Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

SECTION 5

Trial Operation to Actual Operation . . . . . . . . . . . . . . . . . . 77

5-1 Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

5-2 Connection/Disconnection Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

5-3 Checking Sequence Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

5-4 Run Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

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TABLE OF CONTENTS

SECTION 6

Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

6-1 CompoWay/F Communications Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

6-2 Frame Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

6-3 Variable Area Operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

6-4 Read Controller Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102

6-5 Read Controller Attributes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

6-6 Read Controller Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

6-7 Echoback Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

6-8 Operation Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

6-9 Response Code List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

6-10 ASCII List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 10

SECTION 7

Error Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

7-1 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

7-2 Seven-segment Error Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

7-3 Clearing Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Appendices

A Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

B List of Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Terms and Conditions Agreement Read and understand this Manual

Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you have any questions or comments.

Warranty, Limitations of Liability

Warranties

● Exclusive Warranty Omron’s exclusive warranty is that the Products will be free from defects in

materials and workmanship for a period of twelve months from the date of sale by Omron (or such other period expressed in writing by Omron). Omron disclaims all other warranties, express or implied.

● Limitations OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR

IMPLIED, ABOUT NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE PRODUCTS. BUYER ACKNOWLEDGES THAT IT ALONE HAS DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE.

Omron further disclaims all warranties and responsibility of any type for claims or expenses based on infringement by the Products or otherwise of any intellectual property right.

● Buyer Remedy Omron’s sole obligation hereunder shall be, at Omron’s election, to (i) replace

(in the form originally shipped with Buyer responsible for labor charges for removal or replacement thereof) the non-complying Product, (ii) repair the non-complying Product, or (iii) repay or credit Buyer an amount equal to the purchase price of the non-complying Product; provided that in no event shall Omron be responsible for warranty, re pair, indemnity or any other claims or expenses regarding the Products unless Omron’s analysis confirms that the Products were properly handled, stored, installed and maintained and not subject to contamination, abuse, misuse or inappropriate modification. Return of any Products by Buyer must be approved in writing by Omron before shipment. Omron Companies shall not be liable for the suitability or unsuitability or the results from the use of Products in combination with any electrical or electronic components, circuits, system assemblies or any other materials or substances or environments. Any advice, recommendations or information given orally or in writing, are not to be construed as an amendment or addition to the above warranty.

See http://www.omron.com/global/ or contact your Omron representative for published information.

Limitation on Liability; Etc

OMRON COMPANIES SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED IN CONTRACT, WARRANTY, NEGLIGENCE OR STRICT LIABILITY.

Further, in no event shall liability of Omron Companies exceed the individual price of the Product on which liability is asserted.

Application Considerations

Suitability of Use Omron Companies shall not be responsible for conformity with any standards,

codes or regulations which apply to the combination of the Product in the Buyer’s application or use of the Product. At Buyer’s request, Omron will provide applicable third party certification documents identifying ratings and limitations of use which apply to the Product. This information by itself is not sufficient for a complete determination of the suitability of the Product in combination with the end product, machine, system, or other application or use. Buyer shall be solely responsible for deter mining appropriateness of the particular Product with respect to Buyer’s application, product or system. Buyer shall take application responsibility in all cases.

NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE OMRON PRODUCT(S) IS PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.

Programmable Products

Omron Companies shall not be responsible for the user’s programming of a programmable Product, or any consequence thereof.

Disclaimers

Performance Data Data presented in Omron Company websites, catalogs and other materials is

provided as a guide for the user in determining suitability and does not constitute a warranty. It may represent the result of Omron’s test conditions, and the user must correlate it to actual application requirements. Actual performance is subject to the Omron’s Warranty and Limitations of Liability.

Change in Specifications

Product specifications and accessories may be change d at an y time base d on improvements and other reasons. It is our practice to change part numbers when published ratings o r features are changed, or when signifi can t cons truction changes are made. However, some specifications of the Product may be changed without any notice. When in doubt, special part numbers may be assigned to fix or establish ke y specification s for your application. Please consult with your Omron’s representative at any time to confirm actual specifications of purchased Product.

Errors and Omissions Information presented by Omron Companies has been checked and is

believed to be accurate; however, no responsibility is assumed for clerical, typographical or proofr eading errors or omissions.

■ Precaution Classifications

The following conventions are used to indicate and classify precautions in this manual.

Always heed the information provided with them. Failure to heed precautions can result in injury to people or damage to property.

■ Cautions

Safety Precautions

CAUTION

Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury or in property damage.

CAUTION

Minor electric shock, fire, or Product failure may occasionally occur. Do not disassemble, modify, or repair the Product or touch interior of the Product.

Minor burns may occasionally occur. Do not touch the Product during power is being supplied or immediately after power is turned OFF.

Minor injury may occasionally occur due to electrical shock. Do not touch the terminals while power is being supplied. Also, be sure to close the terminal cover after wiring the terminals.

Fire may occasionally occur. Tighten terminal screws to the specified torque.

Minor electric shock, fire, or Product failure may occasionally occur. Do not allow any pieces of metal or conductors or any clippings or cuttings resulting from installation work to enter the Product.

A maximum voltage of 370 V may be generated internally when power is supplied. This voltage will remain for 30 s even after the power supply has been turned OFF.

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The S8AS Smart Power Supply combines the highly reliable S8VS Switch Mode Power Supply with the S8M Digital Multicircuit Protector into a single unit to reduce both wiring and space requirements. The built-in digital circuit protector uses semiconductor relays to close and trip circuits, and does not contain any contact switching mechanisms, as normal circuit protector s do. Observe the following precautions when introducing the S8AS into or using the S8AS in any system.

■ Installation and Storage Environment

1. Store the Product at an ambient temperature of –25 to 65°C and relative humidity of 25% to 90%.

2. To maintain performance of the maintenance forecast monitor, make sure the following conditions are satisfied for long-term storage.

• For storage exceeding three months, keep the Product at a temperature of –20°C to 30°C and a humidity of 25% to 70%.

3. Internal parts may occasionally be deteriorated or damaged. Do not use the Product in conditions exceeding the derating curve (in portion (1) of the derating curve on pagexiv).

4. Inter nal par ts may possibly be damaged. Do not use a current that exceeds the rated total output current. If temporary peak currents occur repetitively, design the system so that the peak currents do not ex ceed the rated total output current.

5. The surrounding air temperature to comply with UL508 and UL60950-1 is 25°C.

6. Use the Product where the relative humidity is 25% to 85%.

7. Do not use the Product where it would be subjected to direct sunlight.

8. Do not use the Product where it would be subjected to the possibility of penetration of liquid, foreign substance, or corrosive ga s.

9. Do not use the Product where it would be subjected to shock or vibration. A device such as a contact breaker may be a vibration source. Set the Product as far as possible from possible sources of shock or vibration. Additionally, install a PFP-M End Plate on each end of the Product after mounting it to a DIN Rail.

10. Use a DIN Rail made of steel. If an aluminum DIN Rail is used, vibration or shock may cause the formation of metal dust due to abrasion of the aluminum.

11. Poor heat dissipation may deteriorate or damage internal parts. Do not loosen the screws on the side of the Product.

12. If the Product is used in an area with excessive electronic noise, be sure to separate the Product as far as possible from the noise sources.

13. Cutoff p erformance is guaranteed according to the a mbient operating temperature. Use the Product withi n the derating range. Refer to the Derating Curve on pagexiv.

14. Poor heat dissipation resulting from improper installation conditions may occasionally deteriorate or damage internal parts and also cause the maintenance forecast monitor function to not operate properly. Do not use any mounting orientation other than a standard one.

15. Do not conne ct a battery or other backup power supply to the output of the Product.

16. To comply with UL standards, insert a fast-breaking, UL-approved fuse rated at 20 A into each input line.

17. Although some inverters have an output frequency of 50/60 Hz, they may cause internal temperatures to rise, possibly resulting in burning, if they are connected as the power source for the S8AS. Do not use the output from an inverter as the power source for the S8AS.

Precautions for Safe Use

Standard Mounting

Face-up Mounting

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■ Installation and Wiring

1. Minor electric shock during operation may occasionally occur. Always attach the cover or take other precautions so that the terminals cannot be touched directly. Also, connect the ground completely. The ground is a protective earth (PE) terminal specified in safety standards. If the ground is not connected completely, electric shock or malfunction may occur.

2. Minor fire may possibly occur. Ensure that input and output terminals are wired correctly.

3. Heat generated by wiring materials may cause the temperature of internal parts to increase, which may result in deterioration of or damage to the internal par ts. Select the wiring ma terials according to the current that is being used.

4. Using the wiring materials, torque, and wire stripping length specified in 3-3 Power Supply and Input/ Output Wiring is recommended to prevent smoke or fire of the wire material due to an abnormal load.

5. It is conceivable that internal parts may be deteriorated or damaged. Do not repeatedly perform cutoff or recovery operations more than necessary.

6. Do not push more than 100 N of force to the terminal block when tightening screws.

7. Be sure to tighten the lock screws on the sides of the connector after connecting any output connector. When removing a connector, be sure the lock screws are completely loose before pulling on the connector.

8. Be sure to remove the sheet covering the Product during installation before turning ON the power.

■ Output Voltage Adjustment

1. The output voltage adjuster (V.ADJ.) may possib l y become damaged. Do not a pply more than the requ ired force.

2. Do not exceed the rated output capacity and rated total output current after adjusting the outp ut voltage.

■ Periodic Inspections

Under normal operating conditions, the Product will require several years or even more than ten years until the maintenance forecast monitor function operates. When using the Product for an extended period of time, perform the following procedure periodically to confirm that the output for the maintenance forecast monitor function (LFE) is operating correctly.

a) Change to Run Mode. b) Confirm that the (LFE) output is ON (electrical continuity between LFE and COM).

Note For details about terminal names, refer to 2-1 Component Names and Functions.

xiv

• When the tripping alarm output operates, always remove the cause of the output first and then reset the

alarm.

• When cycling the input power supply, always remove any problems first and then turn ON the input power

supply.

■ Startup Time

When the input power is turned ON to the S8AS, a hardware check, software check, and initialization processing are performed before the branch outputs are turned ON. Approximately three seconds is required. When using the S8AS with other control equipment, incorp orate the startup time of the S8AS in the overall system design.

■ Installation

• Mounting Direction

Mount the S8AS to a DIN Rail using the standard mounting direction. Do not mount it in any other direction, such as face up. (Refer to 3-1 Installing the S8AS.)

• Mounting Space

The long-term reliability of the S8AS can be increased by installing it properly and sufficiently considering heat dissipation.

Be sure to install the S8AS so that the air flow circulates around it, because the S8AS is designed to radiate heat by means of natural air circulation.

■ Derating Curve

The temperature range within which the S8AS can be used is restricted by the maximum current that normally flows for the total output. This restriction is given as a derating curve.

Note

1. The ambient temperature is measured at a point 50 mm below the S8AS.

2. Use forced cooling if necessary to satisfy the derating curve.

3. For 480-W models , re duce the loa d to 80 % or le ss for long-term use at an input voltage of 95 VAC or less.

■ Abnormal Voltage Tripping

1. The S8AS has an abnormal voltage tripping function. All branch outputs will be cut off if the input voltage exceeds 28.8 VDC. This function, however, does not protect loads and internal parts from high voltages in all cases. Be sure the output voltage is within the rated range .

2. Outputs may be cut off by the abnormal voltage protection with loads that generate reverse peak electromotive force.

Precautions for Correct Use

Load rate (%)

Total output current

Ambient temperature (°C)

120

100

−20 −10 0 10 20 30 40 50 60 70 80

■ Abnormal Current Tripping

The S8AS has an abnormal current tripping function. A branch output will be cut off if its current exceeds a preset value. Also, all branch outputs will be cut off if their total peak output current exceeds a specified value.

Note

1. Continuing operation with o vercurrent may occa sionally result in deterior ation or destruction of internal ele-

ments.

2. Do not use the S8AS for applications in which load inrush current or overload will frequently occur.

Doing so may result in deterioration or damage to internal components.

■ Maintenance Forecast Monitor Function

The accuracy of the maintenance forecast monitor function will be reduced in applications where the AC input turns ON and OFF frequently.

■ Tripping Performance

There are three methods that can be used to determine abnormal current trippings: Standard Detection, Instantaneous Detection, and Extended Detection. (This is not possible for the S8AS-24006N/ 48008N.) Refer to 2-4-2 Over-current Protection Functions for details of cutoff performance.

Note

1. When the tripping alarm output operates, always remove the cause of the output first and then reset the

alarm.

2. When using a load with a fixed-power operation, the S8AS may cause a cutoff when the power supp ly is

turned OFF.

3. Tolerance of current tripping alarm threshold is ±0.3 A.

4. Use Extended Detection only when using OMRON Remot e I/O Terminal with short-circuit detection.

■ Total Peak Output Current

The S8AS is designed to provide a temporary peak current to provide the overcurrent required to start load devices. The total peak output current for all branch outputs combined is given below. If the total current exceeds any of these values, all branch outputs will be cut off according to the size of the peak current or application time to ensure safety.

• 240-W Models

Input voltage range: 200 to 240 VAC Peak current/Peak current pulse width: 17 A max. for 2 s max.

15 A max. for 5 s max. 13 A max. for 10 s max.

12 A max. for 20 s max. If the total output peak current exceeds even one of these conditions, all branch outputs will be shut off to ensure safety.

• 480-W Models

Input voltage range: 200 to 240 VAC Peak current/Peak current pulse width: 27 A max. for 1 s max.

25 A max. for 2 s max.

22.5 A max. for 5 s max.

Note

1. If the input volta ge range is not within the v alues specified abo ve or the total output current e xceeds the max-

imum peak current value, internal operation will become unstable and the branch outputs may be cut off.

2. Maintain the total current f or normal oper ation after the load de vices ha v e started to within the rated r anges.

xvi

3. Do not allow a peak current to flo w again for at least 60 seconds after a peak current has e xceeded the rated

current.

■ Startup Delay

The S8AS has a startup delay function that prevents cutoffs caused by inrush current at startup. The startup delay disables the cutoff operation for 40 ms after the semiconductor relay turns ON. To protect inter nal circuits, however, the relevant branch outputs will be cut off even during the startup delay period if a current limit is exceeded within a specific time period.

Note The startup delay will not operate when a relay or other device is used fo r ON /OFF control on the output

side of the S8AS, so a cutoff operation may occasionally occur.

■ Dielectric Strength Test

The S8AS is designed to withstand 3,000 VAC for 1 minute between the AC input terminals collectively and the branch output, I/O signal, or communications terminals collectively. When testing, set the cutoff current for the withstand voltage test device to 20 mA.

Note

1. The S8AS may possib ly be damage d f rom th e imp ulse voltage if a testing device switch is used to abruptly

apply or cut off 3000 V A C. Increase the applied voltage grad ually using the voltage adjust ment on the testing device.

2. When testing terminals together, always short the specified terminals so that the voltage is applied to all of

the terminals at the same time.

■ Insulation Resistance Test

When testing the insulation resistance, use a DC resistance meter at 500 VDC. Note To prevent damage, always short branch output terminals (+/–), all I/O terminals, and communications

terminals before testing.

■ Output Voltage Adjustment

Default setting: Set as the rated voltage. Adjustable range: Adjustable from –10% to +10% of the rated output voltage by using the V.ADJ. adjuster on the front or the Power Supply. Turning the adjuster clockwise increases the output voltage, and turning it counterclockwise decreases the output voltage.

Note

1. If the output voltage is set to less than 20 V (default setting), the undervoltage detection may be activated.

2. Do not exceed the rated output capacity and rated total output current after adjusting the output voltage.

3. The output voltage may increase beyond the allowable voltage range rated voltage +10% when the V.ADJ

adjuster is used. When adjusting the output voltage, check the output voltage of the power supply to make sure that the load is not damaged.

■ No Output Voltage

The internal circuit’s overcurrent protection or overvoltage protection may operate. Alternatively, the latch protection circuit may operate if there is a lightning surge or other large voltage applied to the input. Contact your OMRON representative if there is still no output voltage after checking the following two points:

• Checking Overcurrent Protection

Check whether the load is in an overcurrent or short-circuited state. Remove the wires to the load before checking.

• Checking Overvoltage Protection and Latching Protecti on

Turn the power supply OFF and leave it OFF for at least 3 minutes, then turn it ON again.

xvii

■ Startup Time

At startup, the S8AS will check hardware and software before starting the operation of branch outputs. A time of approximately 3 se conds is required for these self-diagnostic functions. Take this time into account when designing the system.

■ External Tripping Input

Wire the polarity of the external tripping input correctly. After completing wiring, confirm that operation is correct.

■ Tripping Alarm Output, Undervoltage Detection Output, Maintenance

Forecast Monitor Output, and Over-temperature Output

Photoswitch outputs: 30 VDC max., 50 mA max., residual voltage when ON: 2 V max., leakage current when OFF: 0.1 mA max.

Wire all output signal circuits correctly. Internal current control circuits are not provided internally for output signals. Do not allow the output current to e xceed 50 mA. After completing wiring, confirm that the circuits oper ate correctly.

■ Displaying the Output Voltage

The voltage detection function displays on the 7-segment display the voltage that is monitored at the internal circuit after AC/DC conversion. The displayed voltage will be somewhat lower than the value at the output terminals of the power source due to internal voltage drop. To accurately confirm the output voltage, measure it at the branch output terminal.

■ Prohibition of Parallel Connection

Do not connect branch outputs from the S8AS in parallel. Also, do not connect the branch outputs in parallel with branch outputs of other S8AS Power Supplies.

■ Supplementary Information: Conformity to IEC and EN Safety Stan-

dards

Warning: The S8AS is a Class A product. In a residential, commercial, or light industrial environment, it may cause radio interference. The S8AS is not intended to be installed in a residential environment. In a commercial or light industrial environment with connection to a commercial power supply, the user may be required to take adequate measures to reduce interference.

S8AS

Connections cannot be made in parallel with other branch output circuits.

xviii

■ Notation in this Manual

In this manual, the S8AS Smart Power Supply is referred to as the S8AS.

■ Notation of Setting Data

Setting data codes and contents are displayed in seven-segment display characters, as shown in the following diagram.

Using this Manual

SECTION 1

Features and Functions

This section describes the features and functions of the S8AS.

1-1 Overview of Features and Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1-2 S8AS Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1-3 Table of Basic Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1-4 S8AS Operating Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Overview of Features and Functions Section 1-1

1-1 Overview of Features and Functions

The S8AS Smart Power Supply is a 24-VDC power supply unit with an internal digital circuit protector that incorporates the highly reliable S8VS Switch Mode Power Supply and the S8M Digital Multicircuit Protector in one unit.

The input power supply to the S8AS is 100 to 240 VAC at 50/60 Hz. Models are available for 240 W with 6 branch outputs or for 480 W with 8 branch outputs, with and without communications. Models for which parameters cannot be changed are also available.

The S8AS provides a stable 24-VDC power supply at an output current of 3.8 A maximum.

Model Number Legend

S8AS Model Numbers

Reduced Space, Wiring, and Work

■ Combination of S8VS and S8M

The space required within the control panel and the amount of wiring have been reduced by integr ating a Digit al Mu lticircuit Protector into a Switch Mode Power Supply.

No. Item Code Meaning

1 Output capacity 240 240 W

480 480 W

2 Number of output

branches

06 6 branch outputs 08 8 branch outputs

3 Communications /

Additional functions

blank Changeable parameter settings with no com-

munications

N Unchangeable parameter settings with no

communications

R Changeable parameter settings with communi-

cations (RS-485)

S8AS-@@@@@@

115 mm

170 mm for models with 4 branch outputs

245 mm for models with 8 branch outputs

Overview of Features and Functions Section 1-1

■ S8AS-24006@ (240 W, 6 Branch Outputs)

■ S8AS-48008@ (480 W, 8 Branch Outputs)

Power Supply and Branch Outputs

The power supply section incorporates the highly praised AC-DC conversion circuit of the S8VS Switch Mode Power Supply in order to produce stable 24VDC power.

The branch output circuits consist of the protection circuits and tripping circuits of the S8M Digital Circuit Protector. They support various safety functions, such as overvoltage protection, overcurrent protection, and short-circuit protection, as well as maintenance functions, such as monitoring using the seven-segment display, error indications, and various alarm outputs .

Models that support communications can be monitored from a host computer using RS-485 communications.

Branch Output Tripping Circuits

No-contact Switching The S8AS built-in circuit protectors differ from conventional mechanical con-

tact-type circuit protectors in that they use no-contact transistor relay switching. Without the contact life of mechanical cir cuit protectors, semiconductor relays are able to provide a much longer lifetime. Digital processing also provides other benefits, such as being able to specify de ta ile d overcurrent detec tion conditions.

115 mm

160 mm for models with 6 branch outputs

230 mm for models with 8 branch outputs

115 mm

Conventional contactstyle circuit protector

S8AS built-in circuit protector

Overcurrent tripping mechanism

Overcurrent detection circuit

Overview of Features and Functions Section 1-1

Tripping Current Can be Set for Each Branch Output

The abnormal tripping current value can be set for each branch output. Setting range: 0.5 to 3.8 A (in 0.1 A increments). Tolerance of current tripping threshold: ±0.3 A.

Abnormal Current Detection and Tripping Time

The abnormal current tripping characteristics can be set for each branch output. (This is not possible for the S8AS-24006N/48008N.)

There are three methods that can be used t o dete rmine abnormal current trippings. (This is not possible for the S8AS-24006N/48008N.)

■ Standard Detection

When the current exceeds the set value, the branch output is cut off within 100 ms.

■ Instantaneous Detection

When the current exceeds the set value, the branch output is cut off within 20 ms.

■ Extended Detection

When the current exceeds the set value, the branch output is cut off within 1,000 ms.

Error Indication and Alarm Output for Abnormal Current Tripping

The following will occur when an abnormal current is detected and the branch output is cut off:

• The branch output status indicator will light red.

• The seven-segment display will show the error code A11 and the abnormal current value alternately.

• The external output terminal for tripping alarms (TRP) will tur n ON. (The photoswitch output will turn OFF.)

Always remove the cause of the abnormal current before resetting the alarm.

Tripping for Total Peak Output Current

When the total branch output current exceeds the set value for a specified amount of time, all branch outputs will be cut off.

• All branch output status indicators will light red.

• The seven-segment display will flash the error code A12.

• The external output terminal for tripping alarms (TRP) will tur n ON. (The photoswitch output will turn OFF.)

Abnormal Voltage Tripping

If the output voltage exceeds 28.8 VDC, all branch outputs will be cut off in order to protect load devices. The following will happen when this occurs:

• The seven-segment display will show the error code A10 and the abnormal voltage alternately.

• The external output terminal for tripping alarms (TRP) will tur n ON. (The photoswitch output will turn OFF.)

Internal Temperature Monitor

The S8AS has an built-in temperature sensor that constantly measures the internal temperature. The temperature can be read from the seven-segment display. The temperature display range is −20 t o 10 0°C. The temperature sensor has one external output (TMP), which can be used to control cooling equipment for the control panel.

The temperature output setting range is 25 to 90°C.

• The seven-segment displa y wi ll sho w the err or code A30 and tem per atur e (°C) alternately.

Overview of Features and Functions Section 1-1

• The external output terminal for over-temperature (TMP) will turn ON. (The photoswitch output will turn OFF.)

Maintenance Forecast Monitor Function

This function calculates the condition of the electrolytic capacitor based o n the power-ON time and internal temperature of the Power Supply to forecast when the Power Supply needs to be replaced. The monitor value can be set to between 0.0 and 5.0 years (approximate) in increments of 0.5 years.

The following occurs when the estimated replacement time reaches the set value:

• The seven-segment display will show the error code A23 and the replacement time (years) alternately.

• The external output terminal for the maintenance forecast monitor (LFE) will turn ON. (The photoswitch output will turn OFF.)

Safety Functions If an abnor mal voltage or current is detected, the semiconductor relay will cut

off the branch output. In the unlikely event that the semiconductor relay cannot cut off an abnormal current or short-circuit current, the short-circuit protection fuse will cut the circuit to protect the system. If the branch output is cut off by the fuse, an error indication will not be shown on the seven-segment display and the alarm output (TRP) will not operate.

The overcurrent protection fuse or over-temperature fuse cannot be replaced. If a fuse burns out, use a different branch output or replace the S8AS.

External Outputs The S8AS has 4 external outputs: the Tripping Alarm Output (TRP), Under-

voltage Detection Output (LOW), Maintenance Forecast Monitor Output (LFE), and Over-temperature Output (TMP).

Output Output condition Restoration condition

Tripping Alarm Output (TRP)

• Abnormal voltage tripping If the output voltage exceeds

28.8 V , all branch outputs are cut off.

• Abnormal current tripping If a current exceeding the set value is detected, the corresponding branch output is cut off.

The output status is retained when power is interrupted but can reset with the reset operation.

Test Mode only When even one branch output is disconnected.

Restore by connecting all branch outputs, or by switching to any mode other than Test Mode.

Undervoltage Detection Output (LOW)

Output when the 24 VDC output falls below the undervoltage detection threshold.

This output can be reset with the reset operation. If the alarm is cleared when the power is turned ON, the output will be reset.

Over-temperature Output (TMP)

Output when a temperature exceeding the threshold is detected.

The output is reset automatically when the temperature falls to 3°C below the overtemperature output threshold.

Maintenance Forecast Monitor Output (LFE)

•Output when the estimated replacement time falls below the set value.

• Output when the replacement time can no longer be calculated due to rise in temperature of the power supply section.

•Prepare to replace the Power Supply.

•Take measures to lower the internal temperature.

Overview of Features and Functions Section 1-1

Tripping Functions Using External Signals

Branch outputs can be forcibly cut off by turning ON the External Tripping Input (TRG).

• Tripping using the External Tripping Input can be enabled or disabled independently for each branch output. Refer to Tripping Input Trigger Set- ting: TRG (Trigger) on page 68.

• The Exter nal Tripping Input directly cuts off a b ranch output's DC circuit, so it acts eve n faster than cutting off the output by turning OFF the normal AC power supp ly.

• When a shutdown sequence has been set, this function can be used to set a time lag for the branch output cutoff. (For details, refer to 2-6 Shut- down Sequence Function.)

• The tripping input type can be set. (Refer to 2-7 External Tripping Input Function)

• EGE: Output cut off when the tripping input changes from OFF to ON.

• LVL: Output cut off when the tripping input changes from OFF to ON and connected when tripping input changes from ON to OFF.

Additional Functions

Startup Sequence Function

A delay can be set for t he connection of the br anch outputs . When y ou w ant to apply a startup delay to the branch output, it is not necessary to construct an external sequence circuit. The inrush current can be suppressed by applying a delay and the Power Supply Unit's load can be reduced. (For details, ref er to 2-5 Startup Sequence Function.)

Shutdown Sequence Function

The branch outputs' cutoff can be delayed. When you want to apply a shutdown delay to the branch output, it is not necessary to construct an external sequence circuit. (For details, refer to 2-6 Shutdown Sequence Function.)

Protecting Parameter Settings (Protection Level Settings)

The Protection Level can be set to restrict access to the parameters. Three levels, levels 0, 1, and 2, are available. This function can be used to prevent parameters from being changed or deleted inadvertently.

The default setting is protection level 1. (For details, refer to 4-3 Changing the Protection Level.)

Note The read/wr ite access for models that do not support parameter

changes (S8AS-24006N/48008N) cannot be changed regardless of the protection level.

Protection level Restrictions

0 There are no restrictions on reading and changing the parameter

settings.

1 Permits only reading and changing of the output voltage, current,

internal temperature, and maintenance forecast monitor parameters.

2 Permits only reading of the output voltage, current, internal tem-

perature, and maintenance forecast monitor parameters.

S8AS Operating Modes Section 1-2

1-2 S8AS Operating Modes

The S8AS has 3 operating modes: Run Mode, Setting Mode, and Test Mode.

Note Test Mode can be entered only in protection level 0 or 1.

Changing the Operating Mode

To change the operating mode, press the Up (SEL) (U) and Down (CH) (D) Keys simultaneously for 3 s. The Mode Selection Menu will be displayed. Use the Up (SEL) Key to select the desired operating mode and then press the

Enter ( ) Key.

Note (1) The Protection Level function can restrict parameter rea d/write access to

one of three lev els. F or details, ref er to 4-3 Changing the Protection Level.

(2) The Initialize Parameters function restores all of the S8AS's parameter

settings to their default values. For details on default values, refer to 4-1

Parameter Table. (3) T est Mode can be entered only in protection level 0 or 1. (4) The Setting Mode, Protection Level, or Parameter Initialization options

cannot be accessed with models such as S8AS-24006N/48008N that d o

not permit changes in parameter settings.

Run Mode The output voltage, output current, internal temperature, and

run time are monitored while supplying 24 VDC to the branch outputs. The monitored values can be displayed on the sevensegment display.

The S8AS automatically starts in Run Mode when the S8AS is used for the first time.

Setting Mode This mode is used to set parameters. Branch output connec-

tions are the same as in Run Mode.

Test Mode (See note.)

This mode is used to test operation. The factory default setting for all outputs is ON, so any branch outputs that are not being used must be turned OFF in Test Mode.

Power ON

• When started for the first time

• S8AS was not in Test Mode when power went OFF.

Run Mode

Setting Mode

Press for 3 s.

Mode Selection Menu

Select Run Mode run (RUN)

Select Setting Mode set (SET)

Select T est Mode tst (TST)

S8AS was in Test Mode when power went OFF.

Select Protection Level prt (PRT)

Initialize Parameters ini (INI)

Test Mode (See note 3.)

The Initialize Parameters command is displayed in protection level 0 only.

(See note 4.)

S8AS Operating Modes Section 1-2

Turning the Power ON for the First Time

• When a newly purchased S8AS is turned ON for the first time, it will enter Run Mode with all the branch outputs turned ON. To change parameter settings, return to the Mode Selection Menu and switch to Setting Mode. Refer to SECTION 4 Par ameter Settings for details on setting parameters.

• T o start trial operation or to set branch output con nections after setting the parameters, return to the Mode Se lection Menu and switch to Test Mode. Refer to SECTION 5 Trial Operation to Actual Operation for details on the operations in Test Mode.

• When changing to Run Mode after completing trial operation, return to the Mode Selection Menu and switch to Run Mode. If the power is turned OFF while the S8AS is in Test Mode, the S8AS will enter T est Mode again the next time that the power is turned ON. All branch outputs will retain the connection status they had before the power was turned OFF.

Normal Power-ON Procedure

If the S8AS has been turned ON already, it will enter Run Mode or Test Mode the next time that power is turned ON. If the S8AS was in T est Mode when the power went OFF, it will start in Test Mode. If it was in a mode other than Test Mode when the power went OFF, it will start in Run Mode.

In addition to selecting the operating mode, the Mode Selection Menu can be used to select the protection level and initialize the parameters (see note 2). (These options cannot be selected when using the S8AS-24006N/48008N.)

The Initialize Parameters function restores all of the S8AS's parameter settings to their default values. For details on default values, refer to Turning t he Power ON for the First Time.

Automatic Operation after Power ON

When the rated voltage (100 to 240 VAC, 50/60 Hz) is applied to the AC input terminal block, the S8AS performs self-diagnostics (hardware and software checks) for approximately 3 seconds. (“AS” will flash on the seven-segment display during the self-diagnostic process.) If no errors are detected, the S8AS will immediately start connecting the branch outputs.

Branch outputs will not be connected if they were not set to ON in Test Mode. Furthermore, if the startup sequence function (refer to 2-5 Startup Sequence Function) has been set, the branch outputs will be connected according to their corresponding settings.

Operation in Run Mode

In Run Mode, the S8AS continuously measures the output voltage, branch output circuit currents, and internal temperature, and compares these values to the set values (both user-set par ameters and system set values).

Monitor Operation The monitored output voltage, branch output currents, branch output peak

current, total current, internal temperature, and replacement time can be read on the S8AS's seven-segment display. The displayed value can be switched with the Up (SEL) Key (U) and Down (CH) Key (D).

Tripping Operation If the voltage or current is abnormal, the branch output will be cut off to protect

the circuit.

■ Abnormal Voltage Tripping

All branch outputs will be cut off if the output voltage exceeds 28.8 VDC in order to protect the load devices.

■ Abnormal Current Tripping

A branch output will be cut off if the tripping current threshold (see note) or an abnormal current is detected using the specified current detection method (see note). (The tripping current threshold and current detection method cannot be changed for the S8AS-24006N/48008N.)

Table of Basic Functions Section 1-3

An error code will be displayed, and the tripping alarm output will operate when a branch output is cut off.

Other Status Monitoring The internal temperature and replacement time status are monitored and

error processing is performed if an error is detected.

Operation in Setting Mode

Setting Mode can be used to set the v arious paramet ers. The S8AS is in operating status when it is in Setting Mode. Branch outputs are connected in Setting Mode in the same way as in Run Mode. When an error is detected, branch outputs will be cut off and alarms will be output, just as they are in Run Mode.

Note If an error occurs in Setting Mode, the error code is not displayed.

Operation in Test Mode

In Test Mode, each branch output can be set to ON or OFF (connected or d isconnected).

The factory default setting f o r all outputs is ON, so an y branch outp uts that are not being used must be turned OFF in Test Mode.

In Test Mode, the operation of each branch circuit can be verified as well as the operation of the startup sequence and shutdown sequence.

Note (a) If the power is tur ned OFF while the S8AS is in Test Mode, the

S8AS will enter Test Mode again the next time that the power is turned ON.

(b) When an error occurs in Test Mode, branch outputs will be cut off

and external signals will be output, just as they are in Run Mode. The error code will not be displayed.

Note (1) When the S8AS is shipped from the factory, all bra nch outpu ts ar e se t to

ON (connected) and the S8AS will enter Run Mode when the power is turned ON. After setting the parameters that require changing, switch to Test Mode, set the switching status of the required branch outputs, and then switch to Run Mode.

(2) If a branch output is OFF (disconnected) when the mode is changed from

Test Mode to Run Mode, it will not be connected (ON) in Run Mode.

(3) If the power is turned OFF while the S8AS is in Test Mode, the S8AS will

start in Test Mode the next time that the power is turned ON, but all branch outputs will be OFF.

1-3 Table of Basic Functions

Monitor Functions

Monitored parameter

Details Indications

Seven-

segment

display

Branch

output

number

indicators

Unit

indicators

Output voltage Displays the output voltage. 16.3 to

30.0

Not lit V

Tota l current Displays the sum of all the

branch output currents.

0.0 to 40.0 All branches lit

Branch output current

Displays individual branch output currents.

0.0 to 20.0 Lit A

Table of Basic Functions Section 1-3

Setting Functions Refer to SECTION 4 Parameter Settings for details on parameter settings.

(These parameters cannot be changed for the S8AS-24006N/48008N.)

Branch output peak current

Displays individual branch output peak currents.

0.0 to 20.0 Lit A

(flashing)

Replacement time

Displays the estimated number of years left until the S8AS needs to be replaced. (Setting: 0.0 to 5.0 years, in

0.5-year increments.)

FUL, HLF

0.0 to 5.0

Not lit Yrs

Internal temperature

Displays the S8AS's internal temperature.

−20 to 100 Not lit °C

Monitored parameter

Details Indications

Seven-

segment

display

Branch

output

number

indicators

Unit

indicators

Data name Detail Setting

range

Undervoltage detection threshold

The undervoltage detection output (LOW) is output when the output voltage of the S8AS falls below this detection threshold. The detection threshold can be set in 0.1-V increments. Branch outputs will not be cut off.

18.0 to

26.4 V

Abnormal current tripping threshold

The current tripping threshold can be set for each branch output in 0.1-A increments.

0.5 to

3.8 A

Abnormal current tripping type

The tripping type can be set for each branch output. USU: Standard (tripping within 100 ms) INS: Instantaneous (tripping within 20 ms) LNG: Extended (tripping within 1,000 ms)

USU/INS/ LNG

Maintenance forecast monitor function

Set the expected number of years until the S8AS needs to be replaced. When the estimated value falls below the set value, the maintenance forecast monitor output (LFE) will turn ON. (The photoswitch output will turn OFF.)

0.0 to

5.0 yr

Over-temperature threshold

An excessive temperature rise inside the S8AS will be detected and the over-temperature output (TMP) will turn ON. (The photoswitch output will turn OFF.)

This output can be used to control cooling equipment to reduce the temperature in the control panel.

25 to 90°C

Startup sequence

The connection of branch outputs may be initiated by communications or when the power is turned ON, and a time delay can be set for the connection sequence. Connecting the branch outputs in sequence instead of simultaneously can reduce the inrush current and reduce the load on the Power Supply.

0.0 to

99.9 s

Shutdown sequence

Branch outputs can be disconnected in sequence initiated by communications or an external tripping input (TRP), and a time delay can be set for the sequence.

0.0 to

99.9 s

Tripping trigger input

The external tripping input function (TRG) can be enabled (ON) or disabled (OFF) for each branch output.

OFF, ON

Tripping trigger type

The tripping trigger type can be set for all branches that have the tripping input function enabled.

EGE, LVL

Table of Basic Functions Section 1-3

Tripping/ Alarm Functions

There are three ways for the S8AS's tripping function to operate:

• Tripping by user-set parameters

• Tripping by the S8AS's system monitor

• Tripping by external operation

The external signal outputs include the Tripping Alarm Output (TRP), Undervoltage Detection Output (LOW), Maintenance Forecast Monitor Output (LFE), and Over-temperature Output (TMP).

Tripping Functions

Note (1) The tripping function operates within 100 ms when the S8AS is set to

standard detection, within 20 ms when it is set to instantaneous detection, and within 1,000 ms when it is set to extended detection.

(2) The TRG signal applies only to the branch outputs for which the e xte rnal

tripping input is enabled. For details, refer to 2-7 External Tripping Input Function.

Protection level The Protection Level function can restrict parameter

read/write access by setting one of three levels. The default protection level is level 1.

0 to 2

Reset operation The tripping alarm output and alarm output can be

cleared after removing the cause of the alarm by the following two methods.

•KEY: RST Key only.

• ALL: RST Key or turning power OFF and ON again.

KEY, ALL

Data name Detail Setting

range

Setting Operating range Parameter

settings

Outputs

cut off

Abnormal voltage tripping

Output cut off for voltage over 28.8 VDC. None All branch

outputs

Short-circuit current tripping

Output cut off at 16 A for 20 ms max. Output cut off at 11 A for 60 ms max.

None Individual

branch output

Abnormal total current tripping

Output cut off when the sum of all branch output currents exceeds the set value for a specific length of time.

None All branch

outputs

Abnormal current tripping (See note 1.)

0.5 to 3.8 A (in 0.1-A increments) Select from standard, instantaneous, and extended

detection methods.

Individual branch output

External tripping input

•External input signal (TRG) ON

•Tripping by communications.

Specified output (See note

2.)

Table of Basic Functions Section 1-3

Alarm Output and Error Display Functions

Note (1) In this manual, the lifetime of the Unit is expressed in years.

(2) If the overheating alarm stays on for more than 3 hours, it can no longer

be cleared.

Symbol Output

name

Operation Error code

displayed

TRP Tripping

alarm output

Abnormal Voltage Tripping Operati on When the output voltage exceeds 28.8 VDC,

all branch outputs are cut off and the TRP output is turned ON. (The photoswitch output is turned OFF.)

A10

Abnormal Current Tripping Operation When the branch output current exceeds the

set value, the branch output is cut off and the TRP output is turned ON. (The photoswitch output is turned OFF.)

A11/Current (alternating)

Volt-amperage (VA) Tripping Operation When the voltage times the current (VA)

exceeds the set value for a specified amount of time, the branch output is cut off and the TRP output is turned ON. (The photoswitch output is turned OFF.)

A11/Current (alternating)

Abnormal Total Current Tripping Operation When the total output current exceeds the set

value, all branch outputs are cut off and the TRP output is turned ON. (The photoswitch output is turned OFF.)

A12

Indicates that there are branch outputs that are not connected. This error is not output in any mode other than Test Mode.

When there is a disconnected branch output in Test Mode, the TRP output is turned ON. (The photoswitch output is turned OFF.)

---

LOW Undervolt-

age detection output

Setting range: 18.0 to 26.4 VDC (0.1-V increments)

When the output voltage falls below the set value, the LOW output is turned ON. (The photoswitch output is turned OFF.)

A21/V oltage (alternating)

LFE Mainte-

nance forecast monitor output

Setting range: 0.0 to 5.0 years (0.5-yr increments) (See note 1.)

When the internally calculated replacement time falls below the set value, the LFE output is turned ON. (The photoswitch output is turned OFF.)

A23/ Replacement time (alternating)

Overheating alarm (See note 2.)

LFE output is turned ON (the photoswitch output is turned OFF) when the replacement time cannot be calculated correctly due to rise in internal temperature.

A23/HOT (alternating)

TMP Over-tem-

perature output

Setting range: 25 to 90°C (1°C increments) When the temperature falls below the set

value minus 3°C, the TMP output and the error code shown on the seven-segment display will be automatically cleared.

A30/Temperature (alternating)

S8AS Operating Procedure Section 1-4

1-4 S8AS Operating Procedure

Using the S8AS

Typical Startup Proc edure Using the S8AS's Keys

Summary of Application Objectives and Settings

Preparation

Installation and wiring

Power ON

Set parameters

Trial run in Test Mode

Verify operation

Actual operation

See Section 3 Installation and Wiring.

See Section 4 Initial Settings. (S8AS-24006N/48008N parameters cannot be changed.)

See Section 5 Trial Run. Branch outputs that will not be used can be set to OFF (disconnected.)

Verify proper operation while monitoring status in Run Mode.

Desired objective/

usage

Settings Details

Use as a circuit breaker with overcurrent tripping.

In Setting Mode, set the abnormal current tripping threshold (C-V) for the branch output being used and set the abnormal current tripping detection setting (C-T) to standard detection (USU).

p. 30, p. 62

Use as a circuit breaker for short-circuit current protection.

In Setting Mode, set the abnormal current tripping threshold (C-V) for the branch output being used and set the abnormal current tripping detection setting (C-T) to instantaneous detection (INS).

Detect a drop in power supply voltage.

In Setting Mode, set the undervoltage detection threshold (V-U). Take the alarm signal from the Undervoltage Detection Output (LOW) terminal. When an undervoltage is detected, the sevensegment display will show error code A21 and the LOW output photoswitch output will go OFF.

p. 29, p. 50 p. 63

Apply a separate time lag when connecting each branch output.

In Setting Mode, set the startup sequence (UPS).

p. 37, p. 66

Apply a separate time lag when cutting off each branch output.

In Setting Mode, set the shutdown sequence (DWS) and enable the External Trip ping Input (TRG).

p. 38, p. 67

Use the S8AS replacement time for better maintenance.

The seven-segment display and the LFE terminal signal output can be used to check the estimated replacement time using the maintenance forecast monitor function.

p. 34, p. 64

S8AS Operating Procedure Section 1-4

Monitor temperature rise in control panel and prevent overheating.

In Setting Mode, set the over-temperature output threshold (TMP). Take the signal from the Overtemperature Output (TMP) terminal and use that signal to operate a fan or air conditioner.

p. 35, p. 65 p. 50

Restrict read/write access of parameters to prevent mistaken operations.

Select the protection level setting (PRT) from the Mode Selection Menu and set the desired protection level.

p. 54, p. 59

Desired objective/

usage

Settings Details

SECTION 2

Specifications and Functions

This section provides the specifications of the S8AS and describes special S8AS functions.

2-1 Component Names and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2-2 Internal Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2-3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

2-4 Basic Function Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

2-4-1 Voltage Monitoring and Protection Functions . . . . . . . . . . . . . . . . . 29

2-4-2 Over-current Protection Functions . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2-4-3 Maintenance Forecast Monitor Function . . . . . . . . . . . . . . . . . . . . . 34

2-4-4 Over-temperature Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

2-5 Startup Sequence Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

2-6 Shutdown Sequence Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

2-7 External Tripping Input Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Component Names and Functions Section 2-1

2-1 Component Names and Functions

Component Names

■ 240-W Output Models

■ 480-W Output Models

(1) AC Input Terminals (L and N) and (2) Protective Earth (PE) Terminal

Connect the input power supply (100 to 240 VAC, 50/60 Hz) (commercial power) to the Power Supply.

Do not connect an inverter output as the power supply. Make sure that the protective earth (PE) terminal is connected to ground to

prevent electric shock or malfunction.

(3) Positive (+) and (4) Negative (−) Branch Output Terminals

Connect to each branch output. Positive and negative branch outputs are connected to separate terminal blocks with two positive and two negative terminals for each branch output.

1. AC input terminals

2. Protective earth (PE) terminal

3. Branch output terminals (+)

4. Branch output terminals (−)

6. Output indicator (DC ON)

7. Output voltage adjuster (V.ADJ)

8. Seven-segment display

5. I/O signal terminals

13. Communications terminal

9. Branch output indicators

10. Unit indicators

11. Status indicators

12. Operation keys

1. AC input terminals

2. Protective earth (PE) terminal

6. Output indicator (DC ON)

7. Output voltage adjuster (V.ADJ)

5. I/O signal terminals

3. Branch output terminals (+)

4. Branch output terminals (−)

8. Seven-segment display

13. Communications terminals

9. Branch output indicators

10. Unit indicators

11. Status indicators

12. Operation keys

(The terminal screws are M4.)

L N

100 to 240 VAC,

50/60 Hz

Component Names and Functions Section 2-1

• 240-W Model Outp ut Terminals

• 480-W Model Outp ut Terminals

(5) I/O Signal Terminals

Connect the external outputs and external tripping inputs.

TRP T ripping Alarm Output Turns ON to indicate when an abnormal voltage

or current was detected and the output was cut off (The photoswitch output will turn OFF.).

LOW Undervoltage Detec-

tion Output

Turns ON when the 24-VDC output voltage from the S8AS falls below the threshold. (The photoswitch output will turn OFF.).

LFE Maintenance Forecast

Monitor Output

Turns ON to indicate when the number of years to the set replacement time has been reached (The photoswitch output will turn OFF.).

TMP Over-temperature

Output

Turns ON to indicate that the temperature exceeded the over-temperature output threshold (The photoswitch output will turn OFF.).

Branch output 1

Branch output 2

Branch output 3

Branch output 4

Branch output 5

Branch

output 6

Branch output 1

−

Branch

output 2

−

Branch

output 3

−

Branch output 4

−

Branch output 5

−

Branch output 6

−

Branch output

common (−)

Branch output 7

Branch

output 1

Branch

output 2

Branch output 3

Branch output 4

Branch output 5

Branch output 6

Branch output 1

−

Branch output 2

−

Branch

output 3

−

Branch output 4

−

Branch

output 5

−

Branch output 6

−

Branch output 8

Branch

output 7

−

Branch output 8

−

Branch output

common (−)

TRP

LOW

LFE

TMP

COM

TRG (+)

TRG (−)

Component Names and Functions Section 2-1

(6) Output Indicator (DC ON)

The indicator is lit green when the S8AS is in normal operation. It indicates that the 24 VDC output can be used as a supply voltage.

(7) Output Voltage Adjuster (V.ADJ)

The output voltage is set at a default of the 24-VDC rated voltage. Use the output voltage adjuster to adjust the output voltage.

Note (1) If the output voltage is set to less than 20.0 V (default setting), the under-

voltage detection may be activated.

(2) Do not exceed the rated output capacity and rated t otal output current af-

ter adjusting the output voltage.

(3) The output voltage may increase be yond the allow able vo ltage range (rat-

ed voltage +10%) when the V.ADJ adjuster is used. When adjusting the output voltage, ch eck the output v oltage of the po wer supply to mak e sure that the load is not damaged.

(4) Do not use excessive force to turn the adjuster (V.ADJ). It may be dam-

aged.

(8) Seven-segment Display (Red)

Displays measured values or set values on a 3-digit LED display.

(9) Branch Output Indicators (Orange) (10) Unit Indicator s (Orange)

Shows the branch output number and the unit for the value shown in the seven-segment display.

• Six-branch Output Mod e l

COM Common Terminal Common terminal shared by the four alarm out-

puts above .

TRG (+) TRG (−)

External Tripping Input Can be used to send an input signal from an

external device to cut off a branch output.

The adjustable range is −10% to +10 % of the rated output voltage. Turning the adjuster clockwise increases the output voltage, and turning it counterclockwise decreases the output voltage.

DC ON

V. ADJ

1 to 6: 240 W 1 to 8: 480 W

Lit or flashing when the display is related to the corresponding branch output.

V Lit when displaying the output voltage. A Lit when displaying the output current.

Flashes when displaying the peak output current.

Yrs Lit when the number of years to th e se t repl ace m e n t ti me is

displayed.

8. 8. 8.

1 2 3 4 5 6

V A Yrs°C s

Branch output number indicators

Unit indicators

Component Names and Functions Section 2-1

(11) Status indicators (Green/Red)

Indicate the connection and cut off status for the branch outputs.

• Six-branch Output Mod e l

(12) Operation Keys

(13) Communications Terminals (A (−), B (+)) (Only for Models That Support Communications)

°C Lit when displaying the temperature. s Lit when setting the star tup sequence time or shutdown

sequence time.

Not lit Not

connected

Set to OFF (disconnected) or forcibly

cut off by command.

Green Lit Connected Connected normally.

Flash Not con-

nected

In the startup sequence and waiting for connection.

Red Lit Cut off Cut off due to an error.

Flash Cut off Cut off by an internal error.

Reset (RST) Key Used to clear the error status when a branch output was cut

off by an error or there was an alarm output.

Enter (ENT) Key Used to switch the display item, enter or execute settings, etc.

Up (SEL) Key Used to change the display item forward or to increase a set

value.

Down (CH) Key Used to switch the branch output or to decrease a set value.

The branch output number that is set remains the same in other modes.

Used to connect to the RS-485 communications line.

1 2 3 4 5 6

RST

A (−)B (+)

Internal Configuration Section 2-2

2-2 Internal Configuration

S8AS-24006 (Model with NO Communications and Changeable Parameter Settings) S8AS-24006N (Model with NO Communications and Unchangeable Parameter Settings) S8AS-24006R (Model with Communications and Changeable Parameter Settings)

SCREW (M3.5)

INPUT

AC (L)

AC (N)

Fuse: 12 A

Noise filter

Rectification

Inrush current limit

Harmonic current control

Smoothing

Drive control circuit

Photocoupler

Voltage-ON detection

Rectification and smoothing

Processing circuit (replacement time)

Thermal

fuse

Current-

detection

resistor

Current-

limiting

circuit

Branch output 1

Branch output 2

Branch output 3

Branch output 4

Branch output 5

Branch output 6

Communications between processing circuits (RS-232C)

Processing circuit (main processing)

Voltage detection

Current

fuse

SCREW (M4)

DC OUTPUT

B (+)

A (−)

−V

Communica-

tions circuit

(S8AS-24006R only)

RS-485

TRP

LOW

LFE

TMP

COM TRG+

TRG−

−V

Display

circuit

Switches

Temperature

detection

Current-

detection

resistor

Cutoff circuit

Power supply

detection

Rectification and smoothing

Internal Configuration Section 2-2

S8AS-48008 (Model with NO Communications and Changeable Parameter Settings) S8AS-48008N (Model with NO Communications and Unchangeable Parameter Settings) S8AS-48008R (Model with Communications and Changeable Parameter Settings)

• The S8AS compares the measured input voltage, current, and internal temperature with the preset pa r ameters. These values can be read on the S8AS's seven-segm ent display.

• When an error is detected, the branch output will be cut off or an alar m will be output. The error code and PV will be displayed alternately on the seven-segment display.

• When an abnormal voltage or current is detected, the semiconductor relay will cut off the branch output. In the unlikely event that the semiconductor relay cannot cut off an abnormal current or sho rt-circuit current, the redundant protection circuit, and the short-circuit protection fuse (12.0 A minimum) will operate to protect the system.

• The S8AS has a built-in temperature sensor, which can detect a temperature rise inside the S8AS. When the internal temperature exceeds the detection threshold, the Over-temperature Output (TMP) photoswitch output will turn OFF.

• When an internal circuit has failed, the components can generate excessive heat. As a safety precaution against this kind of failure, the S8AS is equipped with a function that cuts off operation using a thermal fuse.

Models that suppor t communications have a RS-485 port, and can be connected to a host computer.

SCREW (M3.5)

INPUT

AC (L)

AC (N)

Auxiliary power supply circuit

SCREW (M4)

DC OUTPUT

B (+)

A (−)

−V

RS-485

TRP

LOW

LFE

TMP

COM TRG+

TRG−

Current detection

Current-ON detection

Thermal

fuse

Current-

detection

resistor

Current-

limiting

circuit

Branch output 6

Voltage

detection

Current

fuse

Communica-

tions circuit

(S8AS-48008R only)

Display

circuit

Switches

Temperature

detection

Current-

detection

resistor

Cutoff circuit

Branch output 1

Branch output 2

Branch output 3

Branch output 4

Branch output 5

Branch output 7

Branch output 8

Voltage

detection

Control circuits

Process-

ing

circuit

Fuse: 12 A

Noise filter

Rectification

Inrush current limit

Harmonic current control

Smoothing

Drive circuit

Voltage-ON detection

Rectification and smoothing

Communications between processing circuits (RS-232C)

Processing circuit (main processing)

Specifications Section 2-3

2-3 Specifications

Ratings and Characteristics

S8AS-24006@

Item Model S8AS-24006 S8AS-24006N S8AS-24006R

Efficiency (Typ.) 80% min. Input

conditions

Voltage range (See note 1.) 100 to 240 VAC (85 to 264 VAC) Frequency (See note 1.) 50/60 Hz (47 to 63 Hz) Current 100-V input 3.8 A max.

200-V input 2.0 A max. Power factor 0.95 min. Harmonic current EN61000-3-2 Leakage cur-

rent

100-V input 0.5 mA max.

200-V input 1.0 mA max. Inrush current

(See note 2.)

100-V input 25 A max. (for a cold start at 25°C)

200-V input 50 A max. (for a cold start at 25°C)

Output conditions

Number of branches 6 Maximum cutoff output current

(per branch)

3.8 A

Total output current 10 A Allowable voltage range (See

note 3.)

±10 A (with V.ADJ)

Ripple noise voltage 2.0%[P-P] max. (for rated input and output voltage) (See note 4.) Output leakage current 10 mA max. Input fluctuation 0.5 % max. (Input: 85 to 264 VAC, 100 % load) (See note 5.) Load fluctuation (rated input

voltage)

4.0 % max. (rated input, 0% to 100% load) (See note 5.)

Temperature fluctuation 0.05%/°C max. Startup time (See note 2.) 3,000 ms max. (for rated input and output voltage) (See note 4.) Output hold time (See note 2.) 20 ms min. (for rated input and output voltage) (See note 4.)

Functions

Tripping functions

Abnormal volt-

age tripping

28.8 V (Cannot be changed.)

Abnormal cur-

rent tripping

(See note 2.)

Setting range: 0.5 to

3.8 A (in 0.1-A increments)

3.8 A (Cannot be changed.)

Setting range: 0.5 to

3.8 A (in 0.1-A increments)

Abnormal total

current tripping

Branch outputs are cut off when the total output current is more than 17 A for 2 s, 15 A for 5 s, 13 A for 10 s, or 12 A for 20 s.

Tripping Alarm

Output

Photoswitch output 30 VDC max. and 50 mA max., Leakage current: 0.1 mA max., Residual volt-

age: 2 V max.

Undervoltage detection functions

Undervoltage

detection

Setting range: 18.0 to

26.4 V (in 0.1-V increments)

20.0 V (Cannot be changed.)

Setting range: 18.0 to

26.4 V (in 0.1-V increments)

Undervoltage

detection out-

put

Photoswitch output 30 VDC max. and 50 mA max., Leakage current: 0.1 mA max.,

Residual voltage: 2 V max.

Maintenance forecast monitor function

Maintenance

forecast moni-

tor

Setting range: 0.0 to

5.0 yr (in 0.5-yr increments)

0.5 yr (Cannot be changed.)

Setting range: 0.0 to

5.0 yr (in 0.5-yr increments)

Maintenance

forecast moni-

tor output

Photoswitch output 30 VDC max. and 50 mA max., Leakage current: 0.1 mA max.,

Residual voltage: 2 V max.

Specifications Section 2-3

Functions

Over-temperature detection function

Over-tempera-

ture

Setting range: 25 to 90°C (in 1°C increments)

90°C (Cannot be changed.)

Setting range: 25 to 90°C (in 1°C increments)

Over-tempera-

ture output

Photoswitch output 30 VDC max. and 50 mA max., Leakage current: 0.1 mA max.,

Residual voltage: 2 V max.

Display functions

Output voltage

display

Display range: 17.0 to 30.0 V Display accuracy: 2% rdg ±1 digit max.

Output current

display

Branch output display range: 0.0 to 4.0 A Peak output current display range: 0.0 to 20.0 A Total current display range: 0.0 to 40.0 A Display accuracy: 5% FS (4 A) ±1 digit max.

Maintenance

forecast moni-

tor display

Display range: FUL (Full)/HLF (Half)/0.0 to 5.0 yr

Temperature

display

Display range: −20 to 100°C Display accuracy: 2°C ±1 digit max.

External T ripping Input The input can be enabled

or disabled for each branch output.

19.2 to 30 VDC, minimum signal width: 10 ms, tripping after input within 20 ms + the shutdown sequence set time

All branch outputs: Enabled (Cannot be changed.)

19.2 to 30 VDC, minimum signal width: 10 ms, tripping after input within 20 ms + the shutdown sequence set time

The input can be enabled or disabled for each branch output.

19.2 to 30 VDC, minimum signal width: 10 ms, tripping after input within 20 ms + the shutdown sequence set time

Startup sequence Setting range: 0.0 to

99.9 s in 0.1-s increments

Branch output 1: 0.0 s (Cannot be changed.)

Branch output 2: 0.4 s (Cannot be changed.)

Branch output 3: 0.8 s (Cannot be changed.)

Branch output 4: 1.2 s (Cannot be changed.)

Branch output 5: 1.6 s (Cannot be changed.)

Branch output 6: 2.0 s (Cannot be changed.)

Setting range: 0.0 to

99.9 s in 0.1-s increments

Shutdown sequence Setting range: 0.0 to

99.9 s in 0.1-s increments

All branch outputs:

0.0 s (Cannot be changed.)

Setting range: 0.0 to

99.9 s in 0.1-s incre-

ments Communications Not supported Supported (RS-485) Sampling period 1 ms Parallel connection Not supported. Series connection Not supported.

Item Model S8AS-24006 S8AS-24006N S8AS-24006R

Specifications Section 2-3

Note (1) Do not use an inverter output for the Pow er Supply. Inverters with an out-

put frequency of 50/60 Hz are available, but the rise in the internal tem-

perature of the Power Supply may result in ignition or burning. (2) Refer to Derating Curve on pagexiv for details. (3) If the output voltage adjuster (V. ADJ) is turned, the voltage will increase

by more than 10% of the voltage adjustment range. When adjusting the

output voltage, confirm the actual output voltage from the Power Supply

and be sure that the load is not damaged. If the output voltage exceeds

28.8 V, all branch outputs will be cut off.

(4) Rated input and output conditions: Rated input voltage, rated frequency,

rated output voltage, rated total output current, and maximum cutoff out-

put current. (5) 100% load conditions: Rated output voltage, rated total output current,

and maximum cutoff output current.

Others Ambient operating temperature Refer to the derating curve (no icing or condensation). (See note 2.)

Storage temperature −25 5o 65°C Ambient operating humidity 25% to 85% (storage: 25% to 90%) Withstand voltage 3.0 kVAC for 1 min between all input terminals collectively and all branch out-

put, all I/O signal, and all communications terminals collectively (Detection current: 20 mA)

2.0 kVAC for 1 min between all inputs and protective earth (Detection current: 20 mA)

1.0 kVAC for 1 min between protective earth and all branch output, all I/O signal, and all communications terminals collectively (Detection current: 20 mA)

500 VA C f or 1 min between all branch output and all I/O signal/communications terminals collectively (Detection current: 20 mA)

500 VAC for 1 min between all I/O signal terminals collectively and communications terminals collectively (Detection current: 20 mA)

500 VAC for 1 min between all I/O signal terminals collectively and all output signal terminals collectively (detection current: 20 mA)

Insulation resistance 100 MΩ min. at 500 VDC between the protective earth terminal or all input ter-

minals collectively and all branch output, all I/O signal, and all communications terminals collectively

Vibration resistance No abnormality after 10 to 55 Hz at 0.375-mm single amplitude for 2 h each in 3

directions.

Shock resistance

No abnormality after 150 m/s2 3 times each in 6 directions. Output indicator Provided (Color: green) Conducted EMI Conforms to EN 61204-3 Class A and FCC Class A. Radiated EMI Conforms to EN 61204-3 Class A. Safety standards cULus: UL508 (Listing. Class2: Per UL1310), CSA C22.2 No .107.1 (Class2: P er

CSA C22.2 No.223)

cURus: UL60950-1, CSA C22.2 No.60950-1

EN: EN50178, EN60950-1

VDE: VDE0160, VDE0805 Teil1 Weight 1,600 g max.

Item Model S8AS-24006 S8AS-24006N S8AS-24006R

Specifications Section 2-3

S8AS-48008@

Item Model S8AS-48008 S8AS-48008N S8AS-48008R

Efficiency (Typ.) 80% min. Input

conditions

Voltage range (See note 1.) 100 to 240 VAC (85 to 264 VAC) Frequency (See note 1.) 50/60 Hz (47 to 63 Hz) Current 100-V input 7.4 A max.

200-V input 3.9 A max. Power factor 0.95 min. Harmonic current EN61000-3-2 Leakage cur-

rent

100-V input 0.5 mA max.

200-V input 1.0 mA max. Inrush current

(See note 2.)

100-V input 25 A max. (for a cold start at 25°C)

200-V input 50 A max. (for a cold start at 25°C)

Output conditions

Number of branches 8 Maximum

cutoff output cur-

rent (per branch)

3.8 A

Total output current 20 A Allowable voltage range (See

note 3.)

±10 A (with V.ADJ)

voltage)

4.0 % max. (rated input, 0% to 100% load) (See note 5.)

Temperature fluctuation 0.05%/°C max. Startup time (See note 2.) 3,000 ms max. (for rated input and output voltage) (See note 4.) Output hold time (See note

2.)

20 ms max. (for rated input and output voltage) (See note 4.)

Functions

Tripping functions

Abnormal

voltage trip-

ping

28.8 V (Cannot be changed.)

Abnormal

current trip-

ping

(See note

2.)

Setting range: 0.5 to

3.8 A (in 0.1-A increments)

3.8 A (Cannot be changed.)

Setting range: 0.5 to

3.8 A (in 0.1-A increments)

Total abnor-

mal current

tripping

Branch outputs are cut off when the total output current is more than 27 A for 1 s, 25 A for 2 s, or 22.5 A for 5 s.

Tripping

Alarm

Output

Photoswitch output 30 VDC max. and 50 mA max., Leakage current: 0.1 mA max.,

Residual voltage: 2 V max.

Undervoltage detection functions

Undervolt-

age detec-

tion

Setting range: 18.0 to

26.4 V (in 0.1-V increments)

20.0 V (Cannot be changed.)

Setting range: 18.0 to

26.4 V (in 0.1-V increments)

Undervolt-

age detec-

tion output

Photoswitch output 30 VDC max. and 50 mA max., Leakage current: 0.1 mA max.,

Residual voltage: 2 V max.

Maintenance forecast monitor function

Mainte-

nance fore-

cast monitor

Setting range: 0.0 to

5.0 yr (in 0.5-yr increments)

0.5 yr (Cannot be changed.)

Setting range: 0.0 to

5.0 yr (in 0.5-yr increments)

Mainte-

nance fore-

cast monitor

output

Photoswitch output 30 VDC max. and 50 mA max., Leakage current: 0.1 mA max.,

Residual voltage: 2 V max.

Specifications Section 2-3

Functions

Over-temperature detection function

Over-tem-

perature

threshold

Setting range: 25 to 90°C (in 1°C increments)

90°C (Cannot be changed.)

Setting range: 25 to 90°C (in 1°C increments)

Over-tem-

perature

output

Photoswitch output 30 VDC max. and 50 mA max., Leakage current: 0.1 mA max.,

Residual voltage: 2 V max.

Display functions

Output volt-

age

display

Display range: 17.0 to 30.0 V Display accuracy: 2% rdg ±1 digit max.

Output cur-

rent display

Branch output display range: 0.0 to 4.0 A Peak output current display range: 0.0 to 20.0 A Total current disp lay range: 0.0 to 40.0 A Display accuracy: 5% FS (4 A) ±1 digit max.

Mainte-

nance fore-

cast monitor

display

Display range: FUL (Full)/HLF (Half)/0.0 to 5.0 yr

Tempera-

ture display

Display range: −20 to 100°C Display accuracy: 2°C ±1 digit max.

External Tripping Input The input can be enabled

or disabled for each branch output.

19.2 to 30 VDC, minimum signal width: 10 ms, tripping after input within 20 ms + the shutdown sequence set time

All branch outputs: Enabled (Cannot be changed.)

19.2 to 30 VDC, minimum signal width: 10 ms, tripping after input within 20 ms + the shutdown sequence set time

The input can be enabled or disabled for each branch output.

19.2 to 30 VDC, minimum signal width: 10 ms, tripping after input within 20 ms + the shutdown sequence set time

Startup sequence Setting range: 0.0 to

99.9 s in 0.1-s increments

Branch output 1: 0.0 s (Cannot be changed.)

Branch output 2: 0.4 s (Cannot be changed.)

Branch output 3: 0.8 s (Cannot be changed.)

Branch output 4: 1.2 s (Cannot be changed.)

Branch output 5: 1.6 s (Cannot be changed.)

Branch output 6: 2.0 s (Cannot be changed.)

Branch output 7: 2.4 s (Cannot be changed.)

Branch output 8: 2.8 s (Cannot be changed.)

Setting range: 0.0 to

99.9 s in 0.1-s increments

Shutdown sequence Setting range: 0.0 to

99.9 s in 0.1-s increments

All branch outputs:

0.0 s (Cannot be changed.)

Setting range: 0.0 to

99.9 s in 0.1-s incre-

ments Communications Not supported Supported (RS-485) Sampling period 1 ms Parallel connection Not supported. Series connection Not supported.

Item Model S8AS-48008 S8AS-48008N S8AS-48008R

Specifications Section 2-3

Note (1) Do not use an inverter output for the Pow er Supply. Inverters with an out-

put frequency of 50/60 Hz are available, but the rise in the internal tem-

perature of the Power Supply may result in ignition or burning. (2) Refer to Derating Curve on pagexiv for details. (3) If the output voltage adjuster (V. ADJ) is turned, the voltage will increase

by more than 10% of the voltage adjustment range. When adjusting the

output voltage, confirm the actual output voltage from the Power Supply

and be sure that the load is not damaged. If the output voltage exceeds

28.8 V, all branch outputs will be cut off.

(4) Rated input and output conditions: Rated input voltage, rated frequency,

rated output voltage, rated total output current, and maximum cutoff out-

put current. (5) 100% load conditions: Rated output voltage, rated total output current,

and maximum cutoff output current.

Others Ambient operating tempera-

ture

Refer to the derating curve (no icing or condensation). (See note 2.)

Storage temperature −25 5o 65°C Ambient operating humidity 25% to 85% (storage: 25% to 90%) Withstand voltage 3.0 kVAC for 1 min between all input terminals collectively and all branch output,

all I/O signal, and all communications terminals collectively (detection current: 20 mA)

2.0 kVAC for 1 min between all inputs and protective earth (Detection current: 20 mA)

1.0 kVAC for 1 min between protective earth and all branch output, all I/O signal, and all communications terminals collectively (Detection current: 30 mA)

500 VAC for 1 min between all branch output and all I/O signal/communications terminals collectively (Detection current: 20 mA)

500 VAC for 1 min between all I/O signal terminals collectively and communications terminals collectively (Detection current: 20 mA)

500 VAC for 1 min between all I/O signal terminals collectively and all output signal terminals collectively (detection current: 20 mA)

Insulation resistance 100 MΩ min. at 500 VDC between the protective earth terminal or all input termi-

nals collectively and all branch output, all I/O signal, and all communications terminals collectively

Vibration resistance No abnormality after 10 to 55 Hz at 0.375-mm single amplitude for 2 h each in 3

directions.

Shock resistance

No abnormality after 150 m/s

3 times each in 6 directions. Output indicator Provided (Color: green) Conducted EMI Conforms to EN 61204-3 Class A and FCC Class A. Radiated EMI Conforms to EN 61204-3 Class A. Safety standards cULus: UL508 (Listing. Class2: Per UL1310), CSA C22.2 No.107.1 (Class2: Per

CSA C22.2 No.223) cURus: UL60950-1, CSA C22.2 No.60950-1 EN: EN50178, EN60950-1 VDE: VDE0160, VDE0805 Teil1

Weight 2,400 g max.

Item Model S8AS-48008 S8AS-48008N S8AS-48008R

Specifications Section 2-3

External Output and External Tripping Input Specifications

The S8AS has 4 external outputs: the Tripping Alarm Output (TRP), Undervoltage Detection Output (LOW), Maintenance Forecast Monitor Output (LFE), and Over-temperature Output (TMP). It also has an External Tripping Input (TRG).

I/O Circuit Configuration

Note When a branch output is cut off with the External Tripping Input, it cuts off

power to the branch output even faster than turning OFF the S8AS's power supply.

TRG+

TRG−

TRP

LOW

TMP

LFE

Output common

Tripping Alarm Output circuit

Over-temperature Output circuit

External Tripping Input circuit

Undervoltage Detection Output circuit

Maintenance Forecast Monitor Output circuit

Name Circuit configuration I/O specifications

Tripping Alarm Output (TRP), Undervoltage Detection Output (LOW), Maintenance Forecast Monitor Output (LFE) and Over-temperature Output (TMP)

Note A photo relay with a

photo MOS-FET and infrared diode coupling is used.

Output circuit 30 VDC and 50 mA

max.

External Tripping Input (TRG) Input circuit 19.2 to 30.0 VDC

Minimum signal width: 10 ms

TRP LOW LFE TMP

COM

From internal power supply circuit

Signal from CPU

TRG (+)

TRG (−)

Basic Function Details Section 2-4

2-4 Basic Function Details

2-4-1 Voltage Monitoring and Protection Functions

Abnormal Voltage Tripping

When the output voltage converted from AC to DC exceeds 28.8 V, all of the branch outputs will be cut off simultaneously and a TRP alarm will be output. The seven-segment display will show error code A10.

It is not necessary for the user to set any parameters for this function.

Undervoltage Detection

An undervoltage detection threshold can be set between 18.0 and 26.4 V.

Operation • If the output voltage falls below the detection threshold, the seven-seg-

ment display will show the error code A21 and the voltage value, and the Undervoltage Detection Output (LOW) will turn OFF within 100 ms.

• The error display and Alarm Output can be reset when the voltage has been above the detection threshold +0.3 V for 500 ms longer.

Tripping

operation

Seven-segment display Outputs Conditions

required to reset

28.8 VDC min. 20 ms max.

Alternately displays error code A10 and the voltage.

The T ripping Alarm Output (TRP) photoswitch output turns OFF.

Voltage below

28.5 V and after tripping (15 s has elapsed after previous reset.)

24-VDC output voltage

Branch output

TRP output

Reset possible

20 ms max.

28.8 V

28.5 V

Setting

range

Default

value

Operation Seven -

segment

display

Outputs Conditions

required to

reset

18.0 to

26.4 VDC

20.0 V When the voltage is lower than the detection threshold continuously for 80 ms or more, the alarm is output within 100 ms.

Alternately displays error code A21 and the voltage.

The Undervoltage Detection Output (LOW) photoswitch turns OFF.

Voltage abov e the detection threshold +0.3 V continuously for at least 500 ms.

Basic Function Details Section 2-4

2-4-2 Over-current Protection Functions

Abnormal Current Tripping Function

When an abnormal current is detected, the S8AS cuts off the branch outputs via semiconductor relays.

Each branch output's tripping current can be set between 0.5 and 3.8 A (in

0.1-A increments). One of the follo wing three detection methods can be selected for each branch

in order to detect abnormal currents (except for the S8AS-24006N/48008N, which always use the same detection method.)

• Standard detection (tripping within 100 ms)

• Instantaneous detection (tripping within 20 ms)

• Extended time detection (tripping within 1,000 ms)

(V-U) +0.3 V

V-U: Undervoltage detection threshold

Undervoltage detection output (LOW)

100 ms

500 ms

Power supply voltage

Reset possible

Connected

Not connected

Connected

Reset signal

Undervoltage alarm output (LOW)

Branch output voltage

Undervoltage detection threshold

Branch output current

Power supply voltage

Basic Function Details Section 2-4

When the abnormal current is detected and branch output is cut off, the error code (A11) and present current are displayed alternately on the seven-segment display and the Tripping Alarm Output (TRP) is turned OFF.

The status indicator of the branch output that was cut off will flash red. To clear the error, eliminate the cause of the error, and then press the Reset

Key. Once an error has been reset, another reset operation cannot be performed for at least 15 seconds.

Setting

range

Default

value

Tripping

type

Operation Error code

and alarm

output

Conditions required to

reset

0.5 to 3.8 A 3.8 A Standa rd When a current higher than the set value is detected, the branch output is cut off within 100 ms.

The error codeA11 and current are displayed alte rnately on the seven-segment display and the Tripping Alarm Output (TRP) photoswitch output turns OFF.

After tripping (15 s has elapsed after the previous reset.)

Instantaneous

When a current higher than the set value is detected, the branch output is cut off within 20 ms.

Extended time

When a current higher than the set value is detected, the branch output is cut off within 1,000 ms.

Abnormal current tripping threshold

Current

Standard detection: 100 ms max. Instantaneous detection: 20 ms max. Extended detection 1,000 ms max

Tripping Alarm Output (TRP)

Reset possible

Basic Function Details Section 2-4

Current Tripping Characteristics

■ Standard Detection

■ Instantaneous Detection

■ Extended Detection

Note The S8AS contains a current-restricting circuit that prevents a cur-

rent above a specific v alue from flowing. The curren t is thus restricted during the time required to cut off the output.

Note After sampling and converting each branch output's current every 1 ms, the

S8AS processes the values in the CPU and controls the branch outp ut cutoffs. This method achieves high-speed, high-accuracy tripping. In addition, to minimize the effects of excessive currents caused by short-circuits, the S8AS is equipped with built-in current-limiting circuits. Consequently, there is a

Setting range

Tripping region

Currentlimiting by internal circuits

Current (A)

100

Time (ms)

60 20

0.5

3.8 11

16 19

Tolerance of current tripping alarm threshold: ±0.3 A. When the tripping current (0.5 to

3.8 A) is detected, it is cut off within 100 ms.

0.5

3.8

Setting range

Tripping region

Currentlimiting by internal circuits

Current (A)

Time (ms)

Tolerance of current tripping alarm threshold: ±0.3 A. When the tripping current (0.5 to

3.8 A) is detected, it is cut off within 20 ms.

0.5

3.8

1,000

Setting range

Tripping region

Currentlimiting by internal circuits

Current (A)

Time (ms)

Tolerance of current tripping alarm threshold: ±0.3 A.When the tripping current (0.5 to

3.8 A) is detected, it is cut off within 1,000 ms.

Basic Function Details Section 2-4

region in which the current is limited, as shown in the current tripping characteristics graphs.

Abnormal Total Current Tripping Function

The S8AS monitors the total output current as well as the branch output currents. When the total output current exceeds the set value, all branch outputs will be cut off. There are a number of conditions for the tripping current and time. If even one of these conditions is detected, the abnormal total current tripping function will be activated. The following tab le outlines the tripping conditions. (Input voltage range: 200 to 240 VAC)

−: Not applicable

Note (1) If the input voltage range is not within the values specified above or the

total output current exceeds the maximum peak current value, internal operation will become unstable and the branch outputs may be cut off.

(2) Maintain the total current for normal operation after the load de vices hav e

started to within the rated ranges.

(3) Do not allow a peak current to flow again for at least 60 seconds after a

peak current has exceeded the rated current.

Current value

Time

Example sampling chart

Converted digital value

Current actually flowing

1 ms sampling period

Power-ON

time (s)

Total current (A) Operation Error code and

alarm output

Conditions required to

reset

240W 480W

1 s min. --- 27 A When the total

current reaches these values, all branches will be cut off within 20 ms.

The error code A12 will flash on the seven-segment display and the Tripping Alarm Output (TRP) photoswitch output will turn OFF.

After tripping (15 s has elapsed after the previous reset.)

2 s min. 17 A 25 A 5 s min. 15 A 22.5 A 10 s min. 13 A − 20 s min. 12 A −

Basic Function Details Section 2-4

Startup Delay Normally, a large inrush current may run through the system when equipment

starts. Tripping operation can be disabled for a short time after the semiconductor relay goes ON in order to prevent this inrush current from being detected as an abnormal current and cutting off operation. This temporary disabling of the tripping function is called the startup delay.

Note The star tup delay disables the tripping operation for the specified

period of time. The inrush current during th is time can be di spla ye d as the peak output current. The S8AS, how ev er , contains a curren trestricting circuit, so the peak value is not necessarily an accurate measure of the peak inrush current of the connected device.

Safety Functions

Short-circuit Protection Fuse

If an error occurs that prevents the semiconductor relay from cutting off a branch output, the short-circuit protection fuse will blow to protect the circuit.

Note If the fuse blows, that branch output cannot be used.

Thermal Fuse If an error occurs that prevents the semiconductor relay from cutting off a

branch output and the temperature of the S8AS's internal resistors rises abnormally high, the S8AS's thermal fuse will blow to prevent a fire hazard.

Note If the fuse blows, that branch circuit cannot be used.

2-4-3 Maintenance Forecast Monitor Function

The maintenance forecast monitor function calculates the replacemen t time from the power-ON time and internal temperature. The maintenance forecast monitor output (LFE) will operate when the calculated value reaches the set value. (The set value is fixed at 0.5 years for the S8AS-24006N/48008N and cannot be changed.) When the maintenance forecast monitor output (LFE) is turned ON, the error code A23 and the estimated replacement time are displayed alte rnately on the seven-segment display.

Tripping Alarm Output (TRP)

OFF (open)

ON (closed)

Startup delay (40 ms)

100 ms max. (standard detection)

Branch output current

Branch output voltage

Power supply voltage

No cutoff during startup delay even if set value is exceeded.

Abnormal current tripping threshold

OFF (open)

Initial capacity

Electrolytic capacitor capacity

Capacity at replacement time

ful

hlf

4.5

(L-0.5)

1.5

1.0

0.5

0.0

Seven-segment display

Maintenance forecast monitor output LFE output when L = 1.0

5.0 2.0 1.5

0.5 0

1.0

Basic Function Details Section 2-4

When the life of the electrolytic capacitor (expected value = 10 yr) has halved, the remaining life span (5 yr) is divided into 10 levels (in 0.5-yr increments). These levels are used by the maintenance forecast monitor output (LFE) to display the number of years that are left before the Power Supply needs to be replaced.

Note The expected life span of the S8AS is 10 years, but it will change

depending on the amount of time it is in operat ion and t he ambient temperature.

2-4-4 Over-temperature Output

When the temperature exceeds the set value continuously for more than 1 s, the seven-segment display will show error code A30 and the Over-temperature Output (TMP) will go OFF.

The error display and Over-temperature Output are reset automatically when the temperature has been below the set value minus 3°C for more than 5 s.

Over-temperature Output (TMP)

When the temperature falls below the set value minus 3°C, the over-temperature output automatically turns ON.

• The over-temperature output (T MP) can be used to star t an exhaust fan or air conditioner to reduce the temperature in the control panel.

• The initial value is set at 90°C so that the over-temperature output is essentially disabled at the beginning.

Example Application The output is normally closed (ON) and goes OFF when there is an error, so

receive the TMP output through an auxiliary relay. In addition, the output will go ON momentarily when the power is turned ON, so receive the output through a time-delay relay. (For details, refer to page 50.)

Setting

range

Default

value

Operation Seven-

segment

display

Outputs Conditions

required to

reset

25 to 90°C90°C The output is

turned OFF when the temperature higher than the set value continuously for more than 1 s.

Alternately displays error code A30 and the temperature(°C).

The Overtemperature Output (TMP) photoswitch output turns OFF.

Reset automatically when the temperature falls below the set value minus 3°C.

t: Over-temperature output threshold

(t-3)°C

Temperature °C

Error display and Over-temperature Output (TMP)

Automatic reset

1 s

5 s

Basic Function Details Section 2-4

Relationship between Control Panel Temperature and S8AS Internal Temperature

The internal temperature of the S8AS is displayed. This is not necessarily the same as the ambient temperature of the S8AS or the temperature inside the control panel. The difference between the internal temperature of the S8AS and the ambient temperature depends on the current flowing through the S8AS. Consider this difference in the application.

The following graph provides reference information on the displayed internal temperature and the ambient temperature.

Conditions: The same current was output from all branch outputs in a con-

stant-temperature bath held at a const ant temperature

TMP

COM

24 VDC

S8AS

Fan, etc.

Startup Sequence Function Section 2-5

■ 240 W

■ 480 W

2-5 Startup Sequence Function

The inrush current may cause a voltage drop if all of the branch outputs are connected simultaneously and there is little spare capacity in the power supply or the loads connected to the branch output s are capacitiv e loads . A significant voltage drop may cause an output to be cut off. In this case, a time delay can be applied between the connectio ns of the b ran ch outputs t o minimiz e the voltage drop.

Note (1) The time delay can be set between 0.0 and 99.9 s. (If the delay is set to

0.0 s, the startup sequence will not operate and the branch output will be connected immediately.)

(2) The startup sequence is designed for the four branch outputs on one

S8AS. It does not provide time synchron ization between output s on more than one S8AS.

After the power supply is turned ON and the self-diagnostics are performed, the S8AS will start connecting the branch output according to their preset startup sequence times.

Ambient temperature (°C)

Displayed temperature (°C)

0.5 A per branch (total output current: 3 A)

1.67 A per branch (total output current: 10 A)

100

−20

−20 −10 0 10 20 30 40 50 60 70

Ambient temperature (°C)

Displayed temperature (°C)

0.5 A per branch (total output current: 4 A)

2.5 A per branch (total output current: 20 A)

100

−20

−20 −10 0 10 20 30 40 50 60 70

Shutdown Sequence Function Section 2-6

• The branch output's status indicator will flash green during the startup sequence time until it is connected.

• The startup sequence's operation can be verified in Test Mode. For details, refer to 5-3 Checking Sequence Operation.

• The startup sequence for models with unchangeable settings (S8AS-24006N/48008N) cannot be changed.

Note The startup sequence functions in the following processes:

• Connecting when power is turned ON

• Reconnecting during a reset operation

• Simultaneous conn ec tio n of all outp u ts in Test Mode

2-6 Shutdown Sequence Function

When the S8AS's input power supply is turned OFF, all of the branch outputs are turned OFF (disconnected) simultaneously. On the other hand, when the branch outputs are cut off by the external tripping input or com munications, a time delay can be applied between the branch output disconnections.

Note (1) The time delay can be set between 0.0 and 99.9 s. (If the delay is set to

0.0 s, the startup sequence will not operate and the branch output will be cut off immediately.)

(2) The shutdown sequence is designed for the four branch outputs on one

S8AS. It does not provide time synchron ization between output s on more than one S8AS.

Branch output number

12345678

Setting time 0.0 s 0.4 s 0.8 s 1.2 s 1.6 s 2.0 s 2.4 s 2.8 s

Setting time

Power supply voltage

Branch output 1 voltage

Branch output 2 voltage

Branch output 3 voltage

Self-diagnostics (0.5 s min.)

Setting time

Branch output n voltage (n: maximum branch output number)

External Tripping Input Function Section 2-7

(3) When operation is cut off due to an abnormal voltage (above 28.8 V), all

of the branch outputs will be cut off simultaneously.

(4) The shutdown sequence function will operate on a branch output only if

the external tripping input is enabled for that branch output. For details, refer to Tripping Input Trigger Setting: TRG (Trigger) on page 68.

(5) The shutdown sequence setting times f or all branch outputs f or the S8AS-

24006N/48008N are set to 0.0 s and cannot be changed.

• The shutdown sequence's operation can be verified in Test Mode. For details, refer to 5-3 Checking Sequence Operation.

Note The shutdown sequence functions in the following processes:

• Cutoff processing for the external tripping input

• Simultaneous cuto ff of all outp uts in Test Mode

2-7 External Tripping Input Function

The external tripping input (TRG) can be used to cut off or reconnect branch outputs using an external input signal. The following settings are required to

use this function.

The external tripping input is enabled and tripping type for the S8AS-24006N/ 48008N is set to EGE and these settings cannot be changed.

External tripping input

Branch output 1 voltage

Branch output 2 voltage

Branch output 3 voltage

Setting time

Within 20 ms

Branch output n voltage (n: maximum branch output number)

Item Function Settings

External tripping input activation

Enables the external tripping input (TRG) function for each branch.

ON (enabled) OFF (disabled)

Tripping trigger type Sets the external tripping

input trigger signal type.

EGE (edge trigger) LVL (level trigger)

External Tripping Input Function Section 2-7

Tripping Trigger Type: Edge Trigger (EGE)

If the trigger signal (TRG) stays OFF f or more tha n 10 ms and the branch output is disconnected for more than 500 ms, the reset input can be received.

Tripping Trigger Type: Level Trigger (LVL)

Reset *

Branch output B voltage (tripping input disabled)

Trigger signal

Branch output A voltage (tripping input enabled)

10 ms

500 ms

a: 20 ms + Shutdown sequence setting time *: Connected after startup sequence setting time has elapsed.

a b

Branch output B voltage (tripping input disabled)

Trigger signal

Branch output A voltage (tripping input enabled)

a: 20 ms + Shutdown sequence setting time b: 20 ms + Startup sequence setting time

SECTION 3

Installation and Wiring

This section describes how to install and wire the S8AS.

3-1 Installing the S8AS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

3-2 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

3-3 Power Supply and Input/Output Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

3-4 RS-485 Port Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Installing the S8AS Section 3-1

3-1 Installing the S8AS

Installation and Wiring Precautions

To increase the S8AS system's reliability and take full advantage of the S8AS's functions, observe the following precautions when installing the S8AS.

Installation Site Avoid locations with any of the following conditions when installing the S8AS.

• Locations subject to a temperature below −10°C or over 60°C

• Locations subject to a humidity below 25% or over 85% (no condensa tion/ icing)

• Locations subject to direct sunlight

• Locations subject to exposure to liquids, debris, or corrosive gases

• Locations subject to severe shock or vibration

• Locations near equipment that generates strong high-frequency noise or surges

Always enclose or protect the S8AS sufficiently in the following locations.

• Locations subject to static electricity or other forms of noise.

• Locations subject to strong electromagnetic fields.

• Locations subject to possible exposure to radioactivity.

• Locations close to power lines.

Installation in Cabinets or Control Panels

When the S8AS is being installed in a cabinet or control panel, always provide suitable ambient conditions as well as access for operation and maintenance.

Ambient Temperature The operating temperature range for the S8AS is −10°C to 60°C. Observe the

following precautions.

• Provide enough space for good air flow.

• Do not install the S8AS above equipment that generates a large amount of heat, such as heaters, transformers, or high-capacity resistors.

• If the ambient temperature in the cabinet may exceed 60°C, install an exhaust fan or air conditioner and use the Over-temperature Output to operate the cooling equipment.

• Mount the S8AS at least 20 mm away from heat sources.

• Leave at least 75 mm between the S8AS and other devices above and below it.

S8AS

Fan

Control panel

Vent

Installing the S8AS Section 3-1

Other control devices

75 mm min.

20 mm min.

Air flow

Other control devices

Installation Section 3-2

3-2 Installation

When mounting the S8AS in a panel, use DIN Rail. Su rf ace installati on cannot be used.

Mounting in a Panel • The S8AS must be installed in the orientation shown below to ensure

adequate cooling.

• Do not install the S8AS in any of the following orientations.

Incorrect

Installation Section 3-2

External Dimensions

S8AS-24006@ (240-W Model with 6 Branch Outputs)

S8AS-48008@ (480-W Model with 8 Branch Outputs)

Attachment to the DIN Rail

The S8AS attaches to the DIN Rail with one snap. Hang the S8AS on the top of the DIN Rail with the installation notch on the back of the S8AS, pivot the S8AS downward, and press until the S8AS locks securely on the Rail.

1,2,3... 1. Pull out the two lock levers on the S8AS.

Lower the S8AS so that the installation notch hooks onto the top of the DIN Rail.

YrsA

543216

Vs˚C

S8AS-24006

POWER SUPPLY

-V

RS485

A(-) B(+)

50/60Hz AC100-240V 3.8A

INPUT

543216

Class2

OUTPUT

DC 24V 3.8A

- 5- 4- 3- 2- 1 - 6

+ 5+ 4+ 3+ 2+ 1 + 6

V.ADJDC ON

COMTMP

TRG

LFELOWTRP

142.4

115

4.5

124.7 122

34.9

131.8 5.08

160

Three, M3.5 square washers

M4 square washers (sliding: 15 max.)

YrsA

543216

7 8

Vs˚C

S8AS-48008

POWER SUPPLY

76543218

50/60Hz AC100-480V 3.8A

INPUT

COMTMP

TRG

LFELOWTRP

V.ADJDC ON

+ 5+ 4+ 3+ 2+ 1 + 6 + 7 + 8

- 5- 4- 3- 2- 1 - 6 - 7 - 8

-V

Class2

OUTPUT

DC 24V 3.8A

RS485

A(-) B(+)

115

4.5

124.7 122

34.9

131.9 5.08

230

142.4

Three, M3.5 square washers

M4 square washers (sliding: 15 max.)

2. Hook the installation notch on the top of the DIN Rail.

1. Pull out the lock levers.

Installation Section 3-2

2. Press the S8AS onto the DIN Rail and push in the lock levers . Press the lock levers until the locks engage securely.

After the S8AS is mounted on the DIN Rail, attach an End Plate on each side of the Power Supply to secure it in place.

■ Recommended End Plate

Removal When removing the S8AS from the DIN Rail, pull the lock lever down with a

flat-blade screwdriver and pivot the S8AS upward to remov e it.

3. Press the S8AS firmly onto the DIN Rail

4. Press in the lock levers until the locks en

gag

e securely.

PFP-M

4.8

1.3

35.5 35.3

1.8

6.2

M4 spring washer

11.5

M4 × 8 Pan-head screw

SEL

ENT

Power Supply and Input/Output Wiring Section 3-3

3-3 Power Supply and Input/Output Wiring

Wiring Precautions • When wiring, cover the top of the S8AS to prevent wire strands from

entering. After completing the wiring, be sure to remov e the co v er to a v oi d overheating.

• Use the following crimp terminals on the power input wires and tighten the terminal screws to the specified torque.

AC input terminals and protective earth (PE) terminals: M3.5 Negative branch output terminals: M4

Selecting the Wire

Refer to the following table when selecting wire to use for the power supply.

8 mm max.

Terminals Name Recommended

wire diameter

Wire type Torque Wire

stripping

length

Screw terminals

AC input terminals and protective earth (PE) terminal

AWG14 to AWG16 (Crosssection area:

1.309 to

2.081 mm

)

Solid or stranded

1.08 N·m (9.6 in lb)

8 to 10 mm

Branch output terminals (−), UL Standard

AWG12 to AWG14 (Crosssection area:

2.081 to

3.309 mm

)

Solid or stranded

1.2 N·m (10.6 in lb)

8 to 10 mm

Branch output terminals (−), CSA Standard

AWG12 to AWG20 (Crosssection area:

0.517 to

3.309 mm

)

Solid or stranded

1.0 N·m (8.8 in lb)

8 to 10 mm

Screwless terminals

Positive branch output terminals, negative branch output terminals, I/O signal terminals, and communications terminals

AWG12 to AWG24 (Crosssection area:

0.2 to 2.5 mm

)

Solid or stranded

--- 10 mm

AWG Cross-sec-

tional area

(mm

)

Configura-

tion

(wires/mm)

Voltage

drop per A

(mV/m)

Max. recommended current (A)

UL1007

(300 V 80°C)

UL1015

(600 V 105°C)

30 0.051 7/0.102 358 0.12 --28 0.081 7/0.127 222 0.15 0.2 26 0.129 7/0.16 140 0.35 0.5 24 0.205 11/0.16 88.9 0.7 1.0 22 0.326 17/0.16 57.5 1.4 2.0 20 0.517 26/0.16 37.6 2.8 4.0 18 0.823 43/0.16 22.8 4.2 6.0 16 1.309 54/0.18 14.9 5.6 8.0 14 2.081 41/0.26 9.5 --- 12.0 12 3.309 65/0.26 6.0 --- 22.0 10 5.262 104/0.26 3.8 --- 35.0

Power Supply and Input/Output Wiring Section 3-3

Maximum Recommended Current: The values listed in the table above are fo r bundles of up to 4 wires. If 5 or

more wires are bundled together, reduce the max. current to 80% of the listed current.

The following chart shows only the relationship between the voltage drop per meter and the current and wire length. Be sure that the current actually being used does not exceed the max. recommended current.

Voltage Drop per Meter (UL1015 Heat-resistant PVC Wire)

Wiring the AC Input and Protective Earth (PE) Terminals

• Use 100 to 240 VAC (85 to 264 VAC) 50/60 Hz power supply with minimal voltage fluctuation. Use wires with a hi gh current carrying capacities.

• Be sure to connect the protective earth (PE) terminal to ground to prevent electric shock and malfunction.

Wiring the Branch Outputs

Two positive and two negative terminals are used for each branch output.

Voltage drop (mV)

The current shown is the allowed current. In actual applications, use a current below the maximum recommended current.

Current (A)

M3.5

Power supply terminal block

100 to 200 VAC 50/60 Hz (commercial power supply)

Power Supply and Input/Output Wiring Section 3-3

■ Wiring the Branch Output Connector

240 W

480 W

Note You may connect the positive terminals or the negative terminals of the same

branch output in parallel, but do not connect them with other branch outputs. The lock screws on both sides of the branch output connector are loose when shipped from the factory. Tighten them securely after you complete the wiring.

Wiring the Terminal Block Connectors

Use a solid or stranded wire. If you are using stranded wire, twist the end before connecting it to make a clean connection.

• Strip the wire for approximately 10 mm from the end.

• Inser t a flat-blade screwdriver into the release button to release the lock. Insert the wire into the round hole, and then release the button to lock the wire in place.

−

Branch

output 1

Branch

circuit 1

Branch output common (−)

Branch

output 2

Branch

output 3

Branch

output 4

Branch

output 5

Branch

output 6

Branch

output 1

−

Branch

output 2

−

Branch

output 3

−

Branch

output 4

−

Branch

output 5

−

Branch

output 6

−

Branch

circuit 6

−

Branch

output 1

Branch

circuit 1

Branch output common (−)

Branch

output 2

Branch

output 3

Branch

output 4

Branch

output 5

Branch

output 6

Branch

output 1

−

Branch

output 2

−

Branch

output 3

−

Branch

output 4

−

Branch

output 5

−

Branch

output 6

−

Branch

circuit 8

Branch output

common (−)

Branch

output 7

Branch

output 8

Branch output 7

−

Branch

output 8

−

10 mm

Release Button

Power Supply and Input/Output Wiring Section 3-3

• When inserting the wire, make sure that the stripped portion of the wire is fully inserted and not left exposed.

• After completing a connection, lightly pull on the wire to make sure that it has been locked in properly.

Wiring the External Outputs and External Tripping Input

The TRP, LOW, LFE, and TMP outputs operate as normally closed outputs, which are OFF when the power is OFF, ON during normal operation, and OFF when an error has occurred. If you want to use these an external output as a normally open output, invert the signal through an auxiliary relay (X). When doing so, the alarm may turn ON momentarily when the power supply is turned ON. To prevent this, delay the signal through the delay relay (TR).

The branch output is cut off when the External Tripping Input (TRG) is ON (connected).

No. Name Function

1 TRP Tripping Alarm

Output

The photoswitch output turns OFF when the branch output is cut off due to an abnormal voltage or abnormal current.

2 LOW Under voltage

Detection Output

The photoswitch output turns OFF when the output voltage drops below the set value.

3 LFE Maintenance

Forecast Monitor Output

The photoswitch output turns OFF when the estimated replacement time drops below the set value.

4 TMP Over-temperature

Output

The photoswitch output turns OFF when the S8AS's internal temperature exceeds the over-temperature output threshold.

5 COM Output Common Common terminal for the four outputs

described above.

6 TRG (+) External Tripping

Input

Branch outputs can be cut off from an external operation. (The shutdown sequence is applied in this case.)

7TRG (−)

TRP LOW LFE TMP COM TRG(+) TRG(−)

X1 X2

X1 X2 X3 X

Delay Relay

Tripping Alarm

Output

Undervoltage

Detection Output

Maintenance

Forecast Monitor

Output

Over-temperature

Output

Output Common

Positive Tripping

Input (+)

Negative Tripping

Input (−)

Tripping Input

* Output terminals do not have polarity.

Power Supply and Input/Output Wiring Section 3-3

■ Internal Circuits

Output circuits

30 VDC, 50 mA max., photoswitch output

Input circuit

19.2 to 30.0 VDC Minimum signal width: 10 ms

TRG+

TRG−

TRP

LOW

TMP

LFE

Output common

Tripping Alarm Output circuit

Undervoltage Detection Output circuit

Maintenance Forecast Monitor Output circuit

External Tripping Input circuit

Over-temperature Output circuit

RS-485 Port Wiring Section 3-4

3-4 RS-485 Port Wiring

Wiring the RS-485 Port

S8AS models with communications have an RS-485 port that can be connected with a host computer or controller.

Example Connection to a Host Computer

• The connection format is 1:1 or 1:N. Up to 32 nodes can be connected to a host computer.

• Insert a Cramp Filter (E04SR301334 manufactured by SEIWA) in the cable as a countermeasure against noise.

• The node on each end of the transmission path, including the host computer, mu st be spe cified as an end no de (i.e., terminating resistor must be connected.) Use terminating resistor of 120 Ω (1/2 W) with a combined resistance of at least 54 Ω.

• Make sure that the communications specifications are set to the same values for the host computer and the S8AS. (Refer to 4-1 Parameter Table.) When connecting in a 1:N format, make sure that the communications specifications except for the communications unit number are set to the same values for all nodes. A unique communications unit number must be set for each node.

• Strip 10 mm from the ends of the RS485 cable's wires.

• Press the terminal's release button all the way in and insert the wire into the round wire hole. When the wire is inserted, be sure that the wire conductor is not exposed.

• Release the release button to lock the wire in place.

• After wiring, verify that the wires are securely locked in the terminals.

Press the Release Button all of the way in and insert the wire.

10 mm

A (−)

B (+)

1 PWR SG 7 2 NC RDA(−)8 3 SG SDA(−)9 4 PWR NC 10 5 SD 11 6 RD 12

S8AS

CD 1 RD 2 SD 3 ER 4 SG 5 DR 6 RS 7 CS 8 C1 9

S8AS

RS-485

Clamp filter

RDB(+) SDB(+)

A(−) B(+)

Computer

RS-232C interface

Name

K3SC-10

Power Supply

• AC model: 100 to 240 VAC

• DC model: 24 VDC or 24 VAC (50 to 60 Hz)

Name

Note: Terminating resistor (120 Ω, 1/2 W recommended)

We recommend twisting the RS-485 communications lines.

(See note.)

SECTION 4

Parameter Settings

This section explains how to set S8AS parameters.

4-1 Parameter Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

4-2 Switching the Operating Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

4-3 Changing the Protection Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

4-4 Switching to Setting Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

4-5 Individual Branch Output Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

4-6 Shared Parameter Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

4-7 Special Settings and Communications Settings . . . . . . . . . . . . . . . . . . . . . . . 66

Parameter Table Section 4-1

4-1 Parameter Table

The S8AS's operation is determined by the parameter settin gs . Each para meter is set to its default value, but each parameter should be checked and set as required to adjust the S8AS for use in the system .

Parameters cannot be changed for the S8AS-24006N/48008N. Always use the default values.

Parameter LED Indicators Setting range Default

value

Access in each

protection level

(See note 3.)

Seven-

segment

display

Unit

indica-

tor

Branch

output

indicator

210

Branch output 1Current tripping

threshold

c-v A Lit 0.5 to 3.8 A 3.8 A ∆ ❍❍

Current tripping type

c-t A Lit USU: Standard

INS: Instantaneous LNG: Extended

Standard Extended (See note

4.)

××❍

Branch output 2 to 8

Same as branch output 1

Undervoltage detection threshold v-u V --- 18.0 to

26.4 V

20.0 V ∆ ❍❍

Maintenance forecast monitor output

lfe Yrs --- 0.0 to 5.0 yr 0.5 yr ∆ ❍❍

Over-temperature output threshold

tmp °C --- 25 to 90°C 90°C ∆ ❍❍

Startup sequence

Individual branch output settings

ups s Lit 0 to 99.9 s 0 s

(See note

1.)

××❍

Shutdown sequence

Individual branch output settings

dws s Lit 0 to 99.9 s 0 s ××❍

Tripping trigger input setting

Individual branch output settings

trg --- Lit OFF

ON ××❍

Tripping trigger type setting tg5 --- --- EGE: Output cut off

when status changes from OFF to ON

L VL: Output cut off when status changes from OFF to ON, or ON to OFF

EGE ××❍

Communications settings

(See note 2.)

Unit number uno --- --- 0 to 31 1 ××❍ Baud rate dps --- --- 48: 4,800 bps

96: 9,600 bps

9,600 bps

Data length len --- --- 7: 7 bits

8: 8 bits

Stop bits bit --- --- 1: 1 bit

2: 2 bits

2 bits

Parity pty --- --- NON: None

EVEN: Even ODD: Odd

EVN

Send wait time syt --- --- 0 to 999 ms 0 ms

Reset input settings rse --- --- KEY: RST Key only

ALL: RST Key or reset power supply

All ××❍

Parameter Table Section 4-1

×: No access (The parameter cannot be set or displayed.) ∆: Read-only access

❍: Full access (The parameter can be set or displayed.)

Note (1) Parameters cannot be changed for the S8AS-24006N/48008N. Use the

default settings. For details, refer to 2-5 Startup Sequence Function.

(2) The communications settings can be changed for the S8AS-24006R/

48008R only. Changes to the parameters are valid after the power has been turned OFF and ON again.

(3) For information changing the prot ection level, refer to 4-3 Changing the

Protection Level.

(4) The default setting for the S8AS-24006N/48008N is for an extended set-

ting.

Switching the Operating Mode Section 4-2

4-2 Switching the Operating Mode

The following diagram illustrates mode transitions for the S8AS. The S8AS's parameters are set in Setting Mode

Note (1) One of three protection levels can be set to restrict parameter read/write

access. Parameters cannot be changed for the S8AS-24006N/48008N. For details, refer to 4-3 Changing the Protection Level.

(2) Parameter initialization sets all S8AS parameters to their default values.

Parameters cannot be changed for the S8AS-24006N/48008N. For de-

tails, refer to 4-1 Pa rameter Table. (3) T est Mode can be entered only in protection level 0 or 1. (4) The Setting Mode, Protection Level, and P arameter Initialization displa ys

cannot be accessed with models that do not permit changes in par ameter

settings (S8AS-24006N/48008N). (5) If the Mode Selection Menu is entered from Test Mode and then the pow-

er is turned OFF before entering another operating mode, the S8AS will

start in Test Mode the next time it is started.

Starting for the First Time When the S8AS is started for the first time, it will enter Run Mode. The default

protection level is level 1, so the Parameter Initialization Display (INI) cannot be entered without changing the protection level.

Starting for Normal Operation

When the S8AS is started, it will enter Run Mode. If the power was turned OFF while the S8AS was in Test Mode, it will start in Test Mode the next time it is started. The Protection Level or Parameter Initialization Display can be selected from the Mode Selection Menu. These options will not be displayed for the S8AS24006N/48008N.

Switching to the Mode Selection Menu

Press both the Up (SEL) Key ( ) and Down (CH) Key ( ) simultaneously for 3 seconds to display the Mode Selection Menu.

Mode Selection Menu

Power ON

Press for 3 s

(See note 4.)

Test Mode (See note 3.)

Run Mode

Power ON

Setting Mode

Press for 3 s

Initialize Parameters ini (INI)

(See note 4.)

Select Protection Level prt (PRT)

Select T est Mode tst (TST)

Select Setting Mode set (SET)

Select Run Mode run (RUN)

S8AS was not in Test Mode when power went OFF. (See note 5.)

Mode selection menu

The Initialize Parameters command is displayed in protection level 0 only.

· When started for the first time

· S8AS was not in Test Mode when power went OFF. (See note 5.)

Switching the Operating Mode Section 4-2

Switching between Displays in the Mode Selection Menu

When the S8AS is switched to the Mode Selection Menu from Run Mode, the seven-segment display will show “RUN.”

If the Key is pressed, SET will be displayed. If the Key is pressed at this point, the S8AS will enter Setting Mode.

Refer to 4-4 Switching to Setting Mode to 4-7 Special Settings and Communi- cations Settings.

Note This option will not be displayed f or models that do not permit changes

in parameter settings (S8AS-24006/48008N).

If the Key is pressed, TST will be displayed. If the Key is pressed at this point, the S8AS will enter Test Mode. Refer to SECTION 5 Trial Operation to Actual Operation.

Note If the protection level is set to level 2, this option will not be displayed

for any models.

If the Key is pressed, PRT (protect) will be displayed. If the Key is pressed at this point, the S8AS will switch to the protection

level display. Refer to 4-3 Changing the Protection Level for details on setting parameters.

Note This option will not be displayed for models that do not permit change

in parameter settings (S8AS-24006N/48008N).

If the protection level is set to lev el 0, INI will be displa yed when the Key is pressed.

If the Key is pressed at this point, the S8AS will switch to the parameter initialization display.

Note

1. This option will not be displayed for models that do not permit change in parameter settings (S8AS-24006N/48008N).

2. The default protection level is le v el 1. At this le vel, the INI option will not be displayed for any models.

(If the Key is pressed, the S8AS will return to the RUN display.)

r u n

°C

123 4 56

V A Yrs s

s e t

Yrs

°C

t s t

Yrs

°C

p r t

Yrs

°C

i n i

Yrs

°C

Switching the Operating Mode Section 4-2

Note The procedure for initializing parameters is given below. (Parameters cannot

be initialized for the S8AS-24006N/48008N.)

After the parameters have been initialized, the default settings will be in effect and the initial power-ON status will be used.

• The operating mode will be Run Mode.

• All branch outputs will be connected.

• Protection level 1 will be used.

Press the Key from the initialize display (INI). The S8AS will switch to the parameter initialization display.

If the Key is pressed, NO will be displayed. Initialization cannot be performed from this display.

(The S8AS will automatically return to the Parameter Initialization Display (INI) if no key is pressed within 3 s.)

Press the Key . The display will change to YES . The parameters will be initialized if the Key is pressed from this display.

(The S8AS will automatically return to the Parameter Initialization Display (INI) if no key is pressed within 3 s.)

Press the Key to start initializing parameters. INI will flash on the display while parameters are being initialized. When

the display stops flashing, all parameters will have been initialized.

The operating mode will change to Run Mode.

i n i

Yrs

°C

n o

Yrs

°C

()

y e s

Yrs

°C

Flashing

i n i

Yrs

°C

2 4. 0

Yrs

°C

Changing the Protection Level Section 4-3

4-3 Changing the Protection Level

Operations Restricted in the Protection Levels

The protection level function can restrict parameter read/write access to one of three levels, as shown in the following table. (Refer to 4-1 Parameter Table)

The default protection level is level 1. When the parameters are initialized, the protection level is set to le vel 1.

Procedure The factory default protection level is level 1, so the protection level must be

changed in order to switch to level 0. Use the following procedure to change the protection level.

Display the Mode Selection Menu and select the Protection Level setting (PRT).

Level Applicable user Access

Level 0 System administrator All parameters can be read and changed. Level 1 Supervisor Only operational settings related to voltage

and current can be read and changed.

Level 2 General staff A limited number of parameters can be read.

No parameters can be changed.

Press the Key.

LV1 (level 1) will be displayed. The present protection level is level 1 (the default value), so press the

Key to change to level 0.

If the Key is pressed, the LV0 display will flash. When the display stops flashing, the protection level will be switched to level 0 and the S8AS will return to the Protection Level Setting (PRT).

(Returns to PRT.)

p r t

Yrs

°C

l V 1

Yrs

°C

Flashing

l 1

l V 0

Yrs

°C

Switching to Setting Mode Section 4-4

4-4 Switching to Setting Mode

When the S8AS is started, it will enter Run Mode. If the power was turned OFF while the S8AS was in Test Mode, it will star t in Test Mode the next time it is started.

To switch to Setting Mode from Run Mode or Test Mode, select Setting Mode from the Mode Selection Menu, as shown below.

The Mode Selection Menu can be displayed by pressing both the Up (SEL) Key ( ) and Down (CH) Key ( ) simultaneously for 3 seconds.

Selecting the Operating Mode from the Mode Selection Menu

The initial Setting Mode display is the abnormal current tripping threshold (CV) for branch output 1.

The branch output that was most recently modified will be the current branch output regardless of the operating mode.

Once the S8AS is switched to Setting Mode, it will not return to Run Mode automatically.

(To return to Mode Selection Menu, press the and Keys simultaneously for 3 seconds again.)

For details on setting parameters in Setting Mode, refer to the following pages.

If the S8AS is switched to the Mode Selection Menu from Run Mode, RUN (select Run Mode) will be displayed.

Press the Key.

When the

Key is pressed, SET (select Setting Mode) will be dis-

played. If the Key is pressed, the S8AS will switch to Setting Mode.

The initial display for Setting Mode will be displayed.

r u n

Yrs

°C

s e t

Yrs

°C

Branch output number 1 is lit.

c - V

The "A" unit indicator will be lit when a current is displayed.

Yrs

°C

Individual Branch Output Settings Section 4-5

4-5 Individual Branch Output Settings

This section shows the displays and operations when setting parameters in Setting Mode in protection level 0. If the protection level is set to level 1 or 2, some parameters will not be displayed or will be read-only. (For details, see page 54.)

Setting the Abnormal Current Tripping Threshold: C-V (Cutoff Threshold Value)

The initial Setting Mode display (C-V) is used to set the abnormal current tripping threshold. (The branch output that was most recently modified will be the current branch output regardless of the operating mode.)

Note If the branch output's current exceeds the threshold, the output will be cut off.

The current tripping type is set with the following C-T (cutoff type) display. The tripping type can be set in protection level 0 only. After an output is cut off, the sev en-segment display will alternately show error code A11 and the current, and the photoswitch output for Tripping Alarm Output (TRP) will be turned OFF. The error can be cleared immediately, but the next error cannot be cleared for another 15 s.

When the Key is pressed, the SV display will flash. When the flashing stops, the new SV will be saved and the S8AS will return to C-V display.

If you want to confirm the new setting, press the Key again from the C-V display.

c - V

Yrs

°C

c - V

Yrs

°C

(To change the

branch output)

# 8

Yrs

°C

Press the Key to display the set value of the branch output 1 current tripping threshold.

The S8AS will automatically return to the C-V display if no key is pressed within 3 s.

Switch to the current tripping type setting (C-T).

B 5

Yrs

°C

The set value can be changed by pressing the or

Keys.

The setting range is 0.5 to 3.8 A (0.1-A increments).

• If the or Key is pressed for more than 2 s, the SV will change in 1.0-A increments instead of 0.1-A increments.

(

Returns to C-V display.

)

Individual Branch Output Settings Section 4-5

Setting the Abnormal Current Tripping Type: C-T (Cutoff Type)

This parameter can be set in protection level 0 only. Select the current tripping type for the displayed branch output number. (The branch output that was most recently modified will be the current branch

output regardless of the operating mode.)

Press the Key to display the setting.

The setting can be changed by pressing the or Key.

The S8AS will automatically return to the C-T display if no key is pressed within 3 s.

The setting can be changed by pressing the or Key.

When the Key is pressed, the SV display will flash. When the flashing stops, the new SV will be saved and the

S8AS will return to C-T display. If you want to confirm the new setting, press the Key

again from the C-T display.

c -

Yrs

°C

c -

Yrs

°C

(To change the

branch output)

u s u

Yrs

°C

USU (Standard): USU is an abbreviation of “usually.” The output will be cut off within 100 ms. INS (Instantaneous): INS is an abbreviation of “instantaneous.” The output will be cut off within 20 ms. LGN (Extended detection): LNG is an abbreviation of “long.” The output will be cut off within 1,000 ms.

Switch to the Undervoltage Detection Output setting (V-U).

i n s

Yrs

°C

l n g

Yrs

°C

(Returns to C-T display.)

Shared Parameter Settings Section 4-6

4-6 Shared Parameter Settings

Setting the Undervoltage Detection Output Value: V-U (Voltage Under)

After setting the abnormal current tripping threshold and tripping type for all branch outputs, press the Up (SEL) Key ( ) to go to the Undervoltage

Detection Threshold Display (V-U).

Note If the voltage remains below the detection threshold for 80 ms, the photo-

switch output for the Undervoltage Detection Output (LOW) will turn OFF. At the same time, the seven-segment display will show the error code A21 and the voltage val ue.

The alarm output can be cleared after the voltage rises above the threshold +0.3 V for more than 500 ms.

Standard (usu) When the current exceeds the tripping threshold for more than 80

ms, the branch output is cut off and the Tripping Alarm Output (TRP) is turned OFF. Th e output will be cut off within 100 ms.

Instantaneous (ins) When the current exceeds the tripping threshold for more than 10

ms, the branch output is cut off and the Tripping Alarm Output (TRP) is turned OFF. Th e output will be cut off within 20 ms.

Extended (lng) When the current exceeds the tripping threshold for more than 980

ms, the branch output is cut off and the Tripping Alarm Output (TRP) is turned OFF. Th e output will be cut off within 1,000 ms.

(Returns to V-U display.)

V - u

2 * 0

2 ! 5

Yrs

°C

Yrs

°C

Yrs

°C

This parameter sets the undervoltage detection threshold.

Press the Key to display the undervoltage detection's set value (SV).

The SV can be changed by pressing the and Keys.

The setting range is 18.0 to 26.4 V (0.1-V increments).

• If the or Key is pressed for more than 2 s, the SV will change in 1.0-V increments instead of 0.1-V increments.

Change the SV with the and Keys. The S8AS will automatically return to the V-U display if no key is pressed within 3 s.

When the Key is pressed, the SV display will flash. When the flashing stops, the new setting will be saved and the S8AS will return to V-U display.

If you want to confirm the new setting, press the Key again from the V-U display.

Switch to the Maintenance Forecast Monitor Detection Threshold Setting (LFE).

Shared Parameter Settings Section 4-6

Setting the Maintenance Forecast Monitor Detection Threshold: LFE (Life)

The Maintenance Forecast Monitor Detection Threshold Setting (LFE) will be displayed if the Up (SEL) Key ( ) is pressed from the Undervoltage Detec-

tion Threshold Setting Display (V-U).

Note The maintenance forecast monitor output is an estimate of the lifetime of the

electrolytic capacitor in the power supply circuit. It is calculated from the power-ON time and internal temperature. When the estimated lifetime falls below the threshold value, the maintenance forecast monitor output (LFE) photoswitch output will turn OFF, and the seven-segment display will alternately show error code A23 and the remaining lifetime (in 0.5-year increments).

(

Returns to LFE display.

)

l f e

* 5

! 0

Yrs

°C

Yrs

°C

Yrs

°C

This parameter sets the maintenance forecast monitor output.

Press the Key to display the set value (SV). The SV can be changed by pressing the and Keys.

The setting range is 0 to 5 years, in 0.5-year increments.

• If the or Key is pressed for more than 2 s, the SV will change in 1.0-V increments instead of 0.5-V

increments.

Change the SV with the and Keys. The S8AS will automatically return to the LFE display if no key is pressed within 3 s.

When the Key is pressed, the SV display will flash. When the flashing stops, the new setting will be saved and the S8AS will return to LFE display.

If you want to confirm the new setting, press the Key again from the LFE display.

Switch to the Over-temperature Output Threshold Setting (TMP).

Shared Parameter Settings Section 4-6

Setting the Over-temperature Output Threshold: TMP (Temperature)

The Over-Temperature Output Threshold Sett ing (TMP) will be displa y ed if t he Up (SEL) Key ( ) is pressed from th e Ma in te na nce Forecast Monitor Detec-

tion Threshold Setting (LFE).

Note • If the temperature exceeds the threshold value for more than 1 s, the

over-temperature output (TMP) photosw itch output will turn OFF and the seven-segment display will alternate between error code A30 and the measured temperature.

• The error display and over-temperature output are reset automatically after the temperature falls and remains below the threshold value minus 3°C for longer than 5 s.

• The over-temperature output (TMP) operates independently of the other external outputs. This output can be received as a normally closed output and used to start an exhaust fan or air conditioner to reduce the temperature in the control panel.

(

Returns to TMP display.

)

t m p

9 0

8 0

Yrs

°C

Yrs

°C

Yrs

°C

This parameter sets the over-temperature output threshold.

Press the Key to display the over-temperature output threshold (SV). The SV can be changed by press-

ing the and Keys. The setting range is 25°C to 90°C

Change the SV with the and Keys.

•The S8AS will automatically return to the TMP display if no key is pressed within 3 s.

•If the or Key is pressed for more than 2 s, the SV will change in 10°C increments instead of 1°C

increments.

When the Key is pressed, the SV display will flash. When the flashing stops, the new setting will be saved and the S8AS will return to TMP display.

If you want to confirm the new setting, press the Key again from the TMP display.

Switch to the startup sequence setting (UPS).

Special Settings and Communications Settings Section 4-7

4-7 Special Settings and Communications Settings

The Startup Sequence Setting (UPS) will be displayed if the S8AS is in protection level 0 and the Up (SEL) Key ( ) is pressed from the Over-Tempera-

ture Output Threshold Setting Display (TMP), which was described at the end of 4-6 Shared Parameter Settings.

Setting the Startup Sequence: UPS (Startup Sequence)

The startup sequence sets the startup sequence time for each branch out put. (The branch output that was most recently modified will be the current branch

output regardless of the operating mode.)

Note The startup sequence sets a delay before the S8AS connects the branch out-

put after the power is turned ON. Connecting the branch outputs in sequence instead of simultaneously can reduce the inrush current and reduce the load on the power supply. For details on the startup sequence, refer to 2-5 Startup Sequence Function.

(Returns to UPS display.)

u p s

* 0

# 8

Yrs

°C

Yrs

°C

Yrs

°C

Yrs

°C

(To change the branch output)

Press the Key to display the startup sequence time set value (SV) for the current branch output. The SV can

be changed by pressing the and Keys. The setting range is 0.0 to 99.9 s (0.1-s increments).

Note If the or Key is pressed for more than 2 s,

the SV will change in 1.0-s increments instead of

0.1-s increments.

Change the SV with the and Keys. The S8AS will automatically return to the UPS display if no key is pressed within 3 s.

When the Key is pressed, the SV display will flash. When the flashing stops, the new setting will be saved and the S8AS will return to UPS display.

If you want to confirm the new setting, press the Key again from the UPS display. To change the startup sequence settings of other branch

outputs, press the Key from the UPS display to select the desired branch output, and then follow the procedure to change the settings.

Switch to the Shutdown Sequence setting.

Special Settings and Communications Settings Section 4-7

Setting the Shutdown Sequence: DWS (Shutdown Sequence)

The Shutdown Sequence Setting (DWS) will be displayed if the Up (SEL) Key ( ) is pressed from the Startup Sequence Setting Display. The shutdown

sequence sets the shutdown sequence time for each branch output. (The branch output that was most recently modified will be the current branch output regardless of the operating mode.)

Note The shutdown sequence function sets the time that the S8AS waits before

cutting off each branch output when the branch outputs are cut off by the external tripping input or communications. For details on the startup sequence, refer to 2-6 Shutdown Sequence Function.

(Returns to DWS display.)

d w s

* 0

% 5

Yrs

°C

Yrs

°C

Yrs

°C

Yrs

°C

(To change the

branch output)

Press the Key to display the Shutdown Sequence Time Set Value (SV) f or the current branch output. The SV

can be changed by pressing the and Keys. The setting range is 0.0 to 99.9 s (0.1-s increments).

Change the SV with the and Keys. The S8AS will automatically return to the DWS display if

no key is pressed within 3 s. If the or Key is pressed for more than 2 s, the SV

will change in 1.0-s increments instead of 0.1-s incre-

ments. When the Key is pressed, the SV display will flash. When the flashing stops, the new setting will be saved and

the S8AS will return to DWS display.

• If you want to confirm the new setting, press the Key

again from the DWS display.

• To change the shutdown sequence of other branch out-

puts, press the Key from the DWS display to select the desired branch output, and then follow the procedures to change the settings.

Switch to the Tripping Input Trigger Setting (TRG).

Special Settings and Communications Settings Section 4-7

Tripping Input Trigger Setting: TRG (Trigger)

The Tripping Input Trigger Setting (TRG) will be displayed if the Up (SEL) Key ( ) is pressed from the Shutdown Sequence Setting Display.

The tripping input (TRG) can be enabled or disabled independently for each branch output.

(The branch output that was most recently modified will be the current branch output regardless of the operating mode.)

Note (1) If the Exter nal Tripping Input (TRG) is enabled for any branch outputs,

those outputs will be cut off within 20 ms when the TRG input is ON for more than 10 ms.

(2) The shutdown delays specified by the shutdown sequence times will be

applied before disconnecting each output.

(3) When the TRG input goes ON, the seven-segment display will indicate

“TRG.”

(Returns to TRG display.)

t r g

o n

o f f

Yrs

°C

Yrs

°C

Yrs

°C

Yrs

°C

(To change the

branch output)

Press the Key to display the branch output parameter settings.

The setting can be changed by pressing the or Key. ON (enabled): The corresponding branch output will be

cut off when the TRG input is ON.

OFF (disabled): The TRG input has no effect on the corre-

sponding branch output.

Change the setting with the or Key.

• The S8AS will automatically return to the TRG display if no key is pressed within 3 s.

When the Key is pressed, the SV display will flash. When the flashing stops, the new setting will be saved and the S8AS will return to TRG display.

•If you want to confirm the new setting, press the Key again from the TRG display.

• To change the tripping input trigger setting of other branch outputs, press the Key from the TRG display to select

the desired branch output, and then follow the procedure to change the settings.

Switch to the Tripping Input Type Setting (TGS).

Special Settings and Communications Settings Section 4-7

(4) Once the TRG input goes OFF, the cut-off branch outputs can be recon-

nected by pressing the Reset Key.

(5) When all outputs are cut off simultaneously in Test mode or the shutdown

sequence operation is e xecuted via communications , t he br a nch out puts will be cut off regardless of the external tripping input trigger setting.

Tripping Input Type: TGS (Trigger Sense)

The Tripping Input Condition Setting (TGS) will be displayed if the Up (SEL) Key ( ) is pressed from the External Tr ipping Input Trigger Setting Display

(TRG).

(

Returns to TGS display.

)

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Press the Key to display the tripping input type. The setting can be changed by pressing the or Key .

EGE (Edge): Output is cut off when TRG input changes

from OFF to ON.

LVL (Level): Output is cut off when TRG input changes from

OFF to ON, and is connected when TRG input changes from ON to OFF.

Change the setting with the or Key.

• The S8AS will automatically return to the TGS display if no key is pressed within 3 s.

When the Key is pressed, the SV display will flash. When the flashing stops, the new setting will be saved and the S8AS will return to TGS display.

•If you want to confirm the new setting, press the Key again from the TGS display.

This parameter sets the tripping input type for each branch output that has tripping input (TRG) enabled.

Switch to the Communications Unit No. Setting (UNO) for models with communications. (See note.)

Note: For models without communications, switch to Reset Method Setting (page 76).

Special Settings and Communications Settings Section 4-7

Unit Number Setting: UNO (Unit Number)

The Unit Number Setting (UNO) will be displayed if the Up (SEL) Key ( ) is pressed from the External Tripping Input Type Display (TGS).

(Returns to UNO display.)

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Set the S8AS's unit number when using 1:N communications with the host computer.

Press the Key to display the unit number setting. The setting can be changed by pressing the and Keys.

•If the or Key is pressed for more than 2 s, the SV will change by 10s instead of 1s.

When the Key is pressed, the setting will flash. When the flashing stops, the new setting will be saved and the S8AS will return to UNO display.

•If you want to confirm the new setting, press the Key again from the UNO display.

The setting range is 0 to 31. Change the SV with the

and Keys.

•The S8AS will automatically return to the UNO display if no key is pressed within 3 s.

Switch to the Baud Rate Setting (BPS).

Special Settings and Communications Settings Section 4-7

Baud Rate: BPS (Bits Per Second)

The Baud Rate Setting (BPS) will be displayed if the Up (SEL) Key ( ) is pressed from the Unit Number Setting Display (UNO).

(Returns to BPS display.)

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Press the Key to display the baud rate setting. The set

ting can be changed by pressing the or Key. 96: 9,600 bps

48: 4,800 bps

Change the setting with the or Key.

•The S8AS will automatically return to the BPS display if no key is pressed within 3 s.

When the Key is pressed, the setting will flash. When the flashing stops, the new setting will be saved and the S8AS will return to the “BPS” display.

If you want to confirm the new setting, press the Key again from the BPS display.

Switch to the data length setting (LEN).

This parameter sets the RS485 port's baud rate to 4,800 bps or 9,600 bps.

Special Settings and Communications Settings Section 4-7

Data Length: LEN (Bit Length)

The Data Length Setting (LEN) will be displayed if the Up (SEL) Key ( ) is pressed from the Baud Rate Setting Display (BPS).

(Returns to LEN display.)

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This parameter sets the data length to 7 or 8 bits.

Press the Key to display the data length setting. The setting can be changed by pressing the or Key.

7: 7 bits 8: 8 bits

Change the setting with the or Key.

• The S8AS will automatically return to the LEN display if no key is pressed within 3 s.

When the Key is pressed, the setting will flash. When the flashing stops, the new setting will be saved and the S8AS will return to the LEN display.

•If you want to confirm the new setting, press the Key

again from the LEN display.

Switch to the Stop Bits Setting (BIT).

Special Settings and Communications Settings Section 4-7

Stop Bit Setting: BIT (Stop Bits)

The Stop Bit Setting (BIT) will be displayed if the Up (SEL) Key ( ) is pressed from the Data Length Setting Display (LEN).

(Returns to BIT display.)

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This parameter sets the number of stop bits to 1 bit or 2 bits.

Press the Key to display the stop bit setting. The setting can be changed by pressing the or Key. 1: 1 bit

2: 2 bits

Change the setting with the or Key.

• The S8AS will automatically return to the “BIT” display if no key is pressed within 3 s.

When the Key is pressed, the setting will flash. When the flashing stops, the new setting will be saved and the S8AS will return to the “BIT” display.

•If you want to confirm the new setting, press the Key again from the “BIT” display.

Switch to the Parity Setting (PTY).

Special Settings and Communications Settings Section 4-7

Parity Setting: PTY (Parity Bit)

The Parity Setting (PTY) will be displayed if the Up (SEL) Key ( ) is pressed from the Stop Bit Setting Display (BIT).

(Returns to PTY display.)

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This parameter sets the parity to none, even, or odd.

Press the Key to display the parity setting. The setting can be changed by pressing the and

Keys. Evn: Even odd: Odd non: None

Change the setting with the or Key.

• The S8AS will automatically return to the TMP display if no key is pressed within 3 s.

Change the setting with the or Key.

When the Key is pressed, the setting will flash. When the flashing stops, the new setting will be saved and the S8AS will return to the PTY display.

If you want to confirm the new setting, press the Key again from the PTY display.

Switch to the Send Wait Time Setting (SWT).

Special Settings and Communications Settings Section 4-7

Send Wait Time: SWT (Send Wait Time)

The Send Wait Time Setting (SWT) will be displayed if the Up (SEL) Key ( ) is pressed from the Parity Setting Display (PTY).

(Returns to SWT display.)

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This parameter sets the RS-485 port's send wait time.

Press the Key to display the send wait time setting. The setting can be changed by pressing the and

Keys. The setting range is 0 to 999 ms.

Change the setting with the and Keys.

• If the or Key is pressed for more than 2 s, the SV will change in 10-ms increments instead of 1-ms incre-

ments.

• The S8AS will automatically return to the SWT display if no key is pressed within 3 s.

When the Key is pressed, the setting will flash. When the flashing stops, the new setting will be saved and the S8AS will return to SWT display.

•If you want to confirm the new setting, press the Key again from the SWT display.

Switch to the Reset Method Setting (RST).

Special Settings and Communications Settings Section 4-7

Reset Method Setting: RST (Reset)

The error resetting method can be set. This method will be used to reset errors after eliminating the cause of the error.

(Returns to RST display.)

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Press the Key to display the send wait time setting. The setting can be changed by pressing the or

Key. KEY: Errors can be reset using the S8AS Reset Key only. ALL: Errors can be reset using the S8AS Reset Key or by

turning the power supply OFF.

Change the setting with the or Key.

• The S8AS will automatically return to the RST display if no key is pressed within 3 s.

When the Key is pressed, the setting will flash. When the flashing stops, the new setting will be saved and

the S8AS will return to the RST display.

Switch to the Abnormal Current Tripping Threshold Setting (C-V).

This parameter sets the error reset method.

SECTION 5

Trial Operation to Actual Operation

A connection/disconnection test can be performed on each branch output in Test Mode. When the S8AS is shipped from the factory, all branch outputs are connected. If you want to set unused branch outputs so that they are not connected, set those outputs to OFF in Test Mode.

5-1 Test Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

5-2 Connection/Disconnection Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

5-3 Checking Sequence Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

5-4 Run Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Test Mode Section 5-1

5-1 Test Mode

Each branch output's connection status can be checked and the outputs can be connected manually in Test Mode before starting actual operation of the equipment.

The S8AS must be set to protection level 0 or 1 in order to switch to Test Mode. (It is not possible to switch to Test Mode when the S8AS is set to protection level 2.)

Precautions when Checking Operation

Before checking operation in Test Mode, always confirm that it is safe to do so and will not adversely affect the system.

Setting the Branch Outputs That Will Be Used

The S8AS is a power supply unit. When it is shipped from the factory, all branch outputs are set to “ON” (connected). After setting the parameters in Setting Mode, change the connection status as required and then check them.

Errors Occurring During the Connection Test

When an error occurs in Test Mode or the external tripping input is turned ON, the tripping operation will be executed and the appropriate external output will be turned OFF, but the error code will not be displayed.

When the S8AS is switched to Run Mode, the error code will be displayed. In Test Mode, the abnormal tripping output (TRP) will operate if one or more of

the branch outputs are not connected. (The photoswitch outputs will turn OFF.) No error code will be output. This type of TRP output is unique to the Test Mode and will not be retained if the operating mode is changed.

Switching to Test Mode

Press the Key and the Key together for at least 3 s to switch to the Mode Selection Menu and select Test Mode.

Once the S8AS has been switched to Run Mode, it will start in either Run Mode or Test Mode (see note) the next time that the power is turned ON, so

press the and the Keys together for at least 3 s to switch to the Mode Selection Menu.

Note When the S8AS is tur ned OFF in Test Mode, it will restart in Test

Mode.

Test Mode Section 5-1

Operations and Displays in the Mode Selection Menu

If the S8AS is switched to the Mode Selection Menu from Run Mode, RUN will be displayed on the seven-segment display. If the S8AS is switched to the Mode Selection Menu from Setting Mode, SET will be displayed on the seven-segment display.

If the Key is pressed, SET will be displayed. At this point, the S8AS will switch to Setting Mode if the Key is pressed.

• You cannot switch to Setting Mode if using models that do not allow changes to settings (S8AS-24006N/48008N).

If the Key is pressed, TST will be displayed. At this point, the S8AS will switch to Test Mode if the Key is pressed.

Press the Key to change to Test Mode.

The flashing “OFF” display indicates that the S8AS is ready to disconnect branch output 1.

Pressing the Key at this point will disconnect branch output 1.

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Flashing

Connection/Disconnection Test Section 5-2

5-2 Connection/Disconnection Test

Before performing the connection/disconnection test in Test Mode, always confirm that it is safe to do so and will not adversely affect the system.

Use the above procedure to test connecting and disconnecting the branch outputs and set the branch outputs that ar e to be used to “ON.”

Note Be sure to set the branch outputs that will be us ed to “ON.” If a

branch output is not set to “ON” when the S8AS is switched to Run Mode, that branch output cannot be used.

If the Key is pressed a second time when testing the branch outputs, the indictors for all branch outputs will flash and all branch outputs can be connected and disconnected at the same time.

To move to another mode after testing the branch outputs, press both the Key and Key together for at least 3 seconds to switch to the Mode Selec-

tion Menu.

The flashing “OFF” display indicates that the S8AS is ready to disconnect branch output 1.

To disconnect branch output 1, press the Key.

If the Key is pressed, branch output 1 will be disconnected and the output 1 indicator will go OFF. The seven-segment display will flash the “ON” to indicate that the S8AS is ready to connect branch output1.

If the Key is pressed again, branch output 1 will be connected.

To test another branch output, press the Key to change the branch output.

If the Key is pressed, the branch output 2 indicator will begin to flash, indicating that the S8AS is ready to disconnect branch output 2.

To disconnect branch output 2, press the Key.

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All of the branch output status indicators will be lit.

Flashing

The status indicator of branch output 1 will go OFF.

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Checking Sequence Operation Section 5-3

5-3 Checking Sequence Operation

When you want to check the operation of the startup sequence function or shutdown sequence function, press Key until all of the branch output indi-

cators are flashing.

To return to Run Mode after completing the test, press the Key and the Key simultaneously for at least 3 s. The display will return to the Mode Selection Menu's TST display. Specify the next operation mode.

If the S8AS is turned OFF in Test Mode, it will restart in Test Mode the next time that the power is turned ON. All branch outputs will retain the connection status when power is OFF.

Press the Key while testing individual branch outputs until all branch output indicators start flashing.

At this point, the operation all branch inputs can be checked simultaneously. When the “OFF” display is flashing, it indicates that the S8AS is ready to simultaneously disconnect all of the branch outputs.

If the Key is pressed, the S8AS starts cutting off all the branch outputs, and the outputs will be cut off in the pattern specified in the shutdown sequence if the shutdown sequence has been set.

When checking the startup sequences operation, press the

Key to switch to the flashing “ON” display.

If the Key is pressed, the S8AS starts connecting all the branch outputs, and the outputs will be connected in the pattern specified in the startup sequence if the startup sequence has been set.

The indicators for the branch outputs that are ready to be connected will flash green.

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The green indicator is lit. (In this example, all of the branch outputs are connected.)

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OFF (In this example, all of the branch outputs are disconnected.)

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The indicators light green in the order of the connection sequence.

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Run Mode Section 5-4

5-4 Run Mode

Switch to Run Mode after making connection settings and te stin g op eratio n in Test Mode. In Run Mode, the outp ut voltage, present currents for branch outputs, peak output currents for branch outputs, total current, maintenance forecast monitor output, and internal temperature can be displayed. The peak output currents can also be cleared.

Moving from Test Mode to Run Mode

Press the Key and the Key simultaneously for at least 3 s. The display will return to the Mode Selection Menu.

Press the Key while “RUN” is being displayed to move to Run Mode.

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Omron S8AS User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual