Delta MCS-1800 User Manual

DELTA MCS-1800 Power Shelf

Installation, Operation and

Maintenance Manual

www.deltaww.com

Delta MCS 1800 3U

Power Shelf

Installation, Operations and

Maintenance Manual

DELTA ELECTRONICS, INC.

DELTA MCS 1800 3U Power Shelf

Installation, Operations and

Maintenance Manual

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1. General ---------------------------------------------- 1-1

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1.1 Using This Manual

1.2 Safety Notice

2. Product Description ---------------------------------------------- 2-1

2.1 Product Description

2.2 Product Main Features

2.3 System Specifications

3. Power Supply Unit (PSU) ---------------------------------------------- 3-1

3.1 Description

3.2 Specifications

3.3 Operation and Adjustment

3.4 System Alarm

3.5 PSU Block Diagram

3.6 PSU Operating Principle

4. Alarm Control Unit ---------------------------------------------- 4-1

4.1 Description

4.2 Specifications

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1-1

2-1

3-1

3-4

3-5

4-1

4.3 Alarm Control Unit Block Diagram

4.4 Settings and Control

5. DC Distribution ---------------------------------------------- 5-1

5.1 DC Cabling

5.2 Low Voltage Battery Disconnect (System equipped with PDU)

5.3 Battery Connections (System equipped with PDU)

5.4 Battery Temperature Probe Connection (System equipped with PDU)

6. Installation ---------------------------------------------- 6-1

6.1 Preliminary Inspection

6.2 System Mounting

6.3 Module Installation

6.4 Shelf Wiring

6.5 AC Input Connections

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INDEX i

4-4

5-1

6-1

DELTA MCS 1800 3U Power Shelf

Installation, Operations and

Maintenance Manual

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6.6 Battery String Connections (System equipped

with PDU)

6.7 Temperature and Alarm Connections

6.8 EXT. Breaker trip signal I/P Connector Wiring

6.9 AC High Voltage Aux. Relay Output Wiring

7. System Start –Up Procedure ---------------------------------------------- 7-1

7.1 Initial Start-Up Preparation

7.3 Basic Functional Verification 7.2 No Load

Start-Up

7.4 DC Load Connections

7.5 System Functionality Check

7.6 System Operation

8. System Alarms and Troubleshooting ---------------------------------------------- 8-1

8.1 AC Fail Voltage Alarm Description

8.2 High Voltage Shutdown Alarm

8.3 High Voltage Alarm Description

8.4 Low Voltage Alarm

8.5 Low Voltage Disconnect Alarm (System

equipped with PDU)

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6-1

6-2

7-1

8-1

8-2

8.6 Fuse Fail Alarm (System equipped with PDU)

8.7 Alarm Unit Fail

8.8 Rectifier Fail Alarm

9. Maintenance ---------------------------------------------- 9-1

9.1 Cleaning and Maintenance

9.2 Removing and Replacing a Rectifier Unit

10. Acronyms and Abbreviations ----------------------------------------------

ATTACHMENT

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INDEX ii

8-2

8-3

9-1

10-1 ~3

1 General

1.1 Using This Manual

This manual contains specifications and instructions to properly install and maintain the power supply system. Component specifications and drawings are also included.

This manual contains information related to the operation and maintenance of the Alarm Control Unit (ALU), the –48V/+24V Power Supply Unit (PSU), and the Distribution Module. Additional information is provided on system status and alarms, troubleshooting, and system maintenance. Appendix figures of this manual contains drawings, simple block diagram for different functional blocks and systems schematic.

Step-by-step procedures required for the installation and turn-up are detailed. All equipment parameter setting, adjustments, and confirmation, as well as system monitoring, operations, and maintenance procedures, are included.

Warnings are printed in bold, italic lettering. They alert the installation or maintenance craftsperson of a potential hazard to either the equipment or the craftsperson if the warning is not followed.

DELTA MCS-1800 3U Power Shelf

Installation, Operations and

Maintenance Manual

1.2 Safety Notice

Delta Energy Systems is not liable for any hazards incurred by not following proper safety procedures. Installation, operation, and maintenance personnel should always follow these safety rules:

1. Before installing the system, verify the AC input voltage and frequency, the AC breaker rating and type, and other environmental conditions as noted in the specifications.

2. The system has passed stringent system testing prior to shipment. To avoid electrical shock. The rectifier system requires a single ground point permanently connected to earth ground.

3. An AC breaker must provide adequate isolation between the system input and commercial AC main.

4. The environment should be dust free and controlled by an AC system. The area must be free of any flammable vapors or fluids.

5. To avoid electrical hazard, the covers must not be removed on any component, including the ALU and the rectifier.

6. Circuit breakers or fuses must be replaced with approved replacement circuit breakers meeting the original design specification.

7.

All connections must be made per the latest issue of the applicable national and local codes.

1-1

2 Product Description

DELTA MCS-1800 3U Power Shelf

Installation, Operations and

Maintenance Manual

2.1 Product Description

This power Shelf consists of modular rectifiers, an Alarm Control Unit (ALU), and a DC distribution module. Up to four rectifiers and an alarm unit can be equipped on a shelf containing an integrated distribution module. The rectifiers can operate from a universal range of AC line voltages. The High Line (HL) operations are defined at an AC line input range of 165VAC~ 264VAC. The Low Line (LL) operations are defined at an AC line input range of 90 VAC-130 VAC.

The system is controlled and monitored by the ALU. System level rectifier voltage settings, system status, and alarms are displayed on the ALU. The system float voltage, equalize voltage, and alarm thresholds are set from RMS. The ALU also provides automatic derating of the output power over the whole operating line voltages. Figure 1 shows different functional blocks of the system.

2.2 Product Main Features

The Power Shelf has the following main features:

 -48 VDC/120 Amps, or +24VDC/200Amps, N+1 redundancy

 Modular design for scalable, cost effective expansion

 Front access for simple installation and maintenance

 High power density

 Active Power Factor Correction (>. 99PFC)

 High efficiency

 Temperature compensated float voltage control

 Alarm Control Unit

 Low Voltage Battery Disconnect (LVBD) (System equipped with PDU)

 Remote Monitoring and control

2.3 System Specifications

The system specifications are provided in the following sections.

2.3.1 -48V Standard Power Shelf Configuration(MODUL NAME: ES48/120-JAAxx)

(1) AC Input: 175VAC ~ 275VAC, 48Amps. Max

(2) System Capacity: 120Amps. Max.

(3) Rectifier: -48V/30A×1~4

(4) Control and Supervisory Unit

Figure 1 shows a front view of shelf.

2-1

DELTA MCS-1800 3U Power Shelf

Installation, Operations and

Environmental Data

System Environmental Data

Specification Value

Operating temperature

Storage temperature

Humidity 0% to 95% RH

Altitude -300 ft. to 10,000 ft.

Weight Approximately 48 lbs.

EMI/FRI FCC Part 15, Class B and CISPR 22, Class B

Lightning/surge ANSI/IEEE C62.41-1, and IEC 1000-4-5

Seismic Bellcore GR-63-CORE, Zone 4

Safety CUL and UL Listed and Marked

2.3.2 +24V Standard Power Shelf Configuration(MODUL NAME: ES24/200-JAAxx)

(1) AC Input: 175VAC ~ 275VAC, 48Amps. Max

(2) System Capacity: 200Amps. Max.

(3) Rectifier: +24V/50A×1~4

(4) Control and Supervisory

0℃ to +50℃

-40℃ to +70℃

Maintenance Manual

Figure 1 shows a front view of shelf.

Environmental Data

System Environmental Data

Specification Value

Operating temperature

Storage temperature

0℃ to +50℃

-40℃ to +70℃

Humidity 0% to 95% RH

Altitude -300 ft. to 10,000 ft.

Weight Approximately 48 lbs.

Lightning/surge ANSI/IEEE C62.41-1, and IEC 1000-4-5

Seismic Bellcore GR-63-CORE, Zone 4

Safety CUL and UL Listed and Marked

2.3.3 -48V System with Power Distribution and Rectifiers(MODUL NAME: ES48/90-JBAxx)

(1) AC Input: 175VAC ~ 275VAC, 36Amps. Max

(2) System Capacity: 90Amps. Max.

(3) Rectifier: -48V/30A×1~3

(4) Control and Supervisory

(5) Load Distribution: 30A Breaker×5 @ Single Pole

(6) Low Voltage Disconnect Switch: 100A×1 @ Single Pole at Battery Side

(7) Battery Breaker: 100A×1

(8) AC Breaker

2-2

DELTA MCS-1800 3U Power Shelf

Installation, Operations and

Maintenance Manual

Figure 1-1 shows a front view of shelf.

Environmental Data

System Environmental Data

Specification Value

Operating temperature

Storage temperature

Humidity 0% to 95% RH

Altitude -300 ft. to 10,000 ft.

Weight Approximately 48 lbs.

Lightning/surge ANSI/IEEE C62.41-1, and IEC 1000-4-5

Seismic Bellcore GR-63-CORE, Zone 4

2.3.4 -48V System with Power Distribution and Rectifiers(MODUL NAME: ES48/90-JFAxx)

(1) AC Input: 175VAC ~ 275VAC, 36Amps. Max

(2) System Capacity: 90Amps. Max.

(3) Rectifier: -48V/30A×1~3

0℃ to +50℃

-40℃ to +70℃

(4) Control and Supervisory

(5) Load Distribution: 100A Breaker×4 @ Single Pole

(6) Low Voltage Disconnect Switch: 100A×1 @ Single Pole at Battery Side

Figure 1-1 shows a front view of shelf.

Environmental Data

System Environmental Data

Specification Value

Operating temperature

Storage temperature

0℃ to +50℃

-40℃ to +70℃

Humidity 0% to 95% RH

Altitude -300 ft. to 10,000 ft.

Weight Approximately 48 lbs.

EMI/FRI FCC Part 15, Class B and CISPR 22, Class B

Lightning/surge ANSI/IEEE C62.41-1, and IEC 1000-4-5

Seismic Bellcore GR-63-CORE, Zone 4

Safety CUL and UL Listed and Marked

2.4 Electrical Data

The system electrical data is provided in the following tables.

2.4.1 Input

2-3

DELTA MCS-1800 3U Power Shelf

Installation, Operations and

Maintenance Manual

Table 1 displays the system input specifications.

Table 1 System Input Specifications

Specification Value

Nominal range 175 ~ 275VAC

90 ~ 275VAC Full Load

Operational range

150V ~ 175Vac de-rating to 80% Load

90V ~ 150Vac de-rating to 50% Load 50℃ ~ 65℃ de-rating 1500W

Frequency 45 ~ 65Hz

Power Factor >0.99 @ 220VAC, Full Load

THD <5% @ 220VAC, Full Load

Efficiency >90% @ 220VAC, Full Load

2.4.2 Output

Table 2 displays the system output specifications.

Table 2 System Output Specifications

Specification Value

DC Volts

38~60 VDC (-48V Version) 20~30 VDC (+24V Version)

Load regulation <1%

Line regulation <0.2%

Current Limit 110%

Current share <5%

Noise:

Audio band Wide band Acoustic

<2mv <10 mVrms <55 dBA

2.4.3 Status/Alarm Indicators

The Power Shelf has the following status/alarm indicators:

 Load Current

 AC ON

 Rectifier Fail Alarm (RFA)

 Current Limit (CL)

 Float/Equalize (FL/EQU)

 Major Alarm (MAJ)

 Minor Alarm (MIN)

 High Voltage Alarm (HV)

 High Voltage Shutdown (HVSD)

 Low Voltage Alarm (LV)

 Low Voltage Disconnect Open (LVDS OPEN)

 Fuse Blown (FUSE ALM)

 AC Fail (AC FAIL)

2-4

DELTA MCS-1800 3U Power Shelf

Installation, Operations and

Maintenance Manual

2.4.4 Mechanical Data

Dimension Value

Height 5.2 in. (132mm)

Depth 10.35 in. (263mm)

Width 3.3 in. (83.6mm)

2-5

3 Power Supply Unit (PSU)

DELTA MCS-1800 3U Power Sh

Installation, Operations and

Maintenance Manual

elf

3.1 Description

This rectifier units are rated at full load when operated from high line. For Low operation, the output is derated to half load. This derating is automatically activated from the Alarm Control Unit (ALU). However, the rectifier can operate on a stand-alone basis, if this ALU is removed or nonfunctional.

Warning: In the absence of the ALU, the automatic derating of the rectifiers at Low Line is not effective.

The modular design provides the flexibility to configure and expand the system as the load demand increases. Each rectifier unit is swappable with front access for ease of maintenance without system shutdown, providing uninterrupted service.

The rectifier unit has an active power factor correction of greater than 0.99 for maximum AC utilization. Each module is equipped with an AC switch located at the front of the module. Figure 3 shows a front view of PSU.

Note: The equipment is only for installation in a Restricted Access Location. The equipment is used on a stationary equipment/unit only.

3.2 Specifications

Detailed rectifier specifications are provided in the following sections.

3.2.1 Electrical

Detailed electrical specifications for the rectifier are provided in this section.

Exceeding the 50% load limit at Low Line may damage the rectifiers.

3.2.1.1 Input

Table 6 displays the rectifier input specifications.

Table 6 Rectifier Input Specifications

Specification Value

Input Voltage

Input Current 12 Amps at 176 VAC, Full Load

Line Frequency 45 to 65 Hz

Power Factor >0.99, at 220 VAC Input, Full Load

THD <5%, at 220 VAC Input, Full Load

Efficiency

Inrush Current <12 Amps (peak), 220 VAC, Full Load, Cold Start

Start Time Delay (Walk-In)

Protection Fuse

90VAC to 275VAC, Single Phase, (during 176 to 150VAC derated to 80% Load, during 150 to 90VAC derated to 50% Load)

>90%, Full Load (-48V Version)

>88%, Full Load (+24V Version)

3 to 10 seconds

3-1

DELTA MCS-1800 3U Power Sh

elf

Installation, Operations and

Maintenance Manual

3.2.1.2 Output

Table 7 displays the rectifier output specifications.

Table 7 Rectifier Output Specifications

Specification Value

40 to 60VDC [factory preset at –54.3VDC, 30Amps (HL) / 15Amps (LL)] –48V Version

DC Output Voltage

20 to 30VDC [factory preset at 27.2VDC, 50Amps (HL) / 25Amps (LL)] +24V Version

Output Power

1800W Maximum (-48V Version)

1500W Maximum (+24V Version)

Regulation:

Load

Line

<1% (Load 0 to 100%)

<0.1%

Current Limit 110% Max. of Rated Output Current

Noise:

Audio Band

Wide Band

Acoustic

<2mV

<20 mVrms (10 KHz to 100 MHz)

<55 dBA @ 1M

Current Sharing <5% of Rated Output Current

Dynamic Response

10% to 90% Load Change Overshoot ≤5% Rated Output Voltage Recovery Time <1 ms to ≤1% Rated Output Voltage

Protection Fuse

3.2.1.3 Protection

Table 8 displays the protection specifications.

Table 8 Protection Specifications

Condition Response

High Output Voltage (Exceeds Preset Value)

Automatic Shutdown and Latch

Over Current/Output Short Automatic Shutdown and Recovery

Over Temperature Automatic Shutdown and Recovery

Brownout No Damage

AC Input Voltage High Automatic Shutdown and Recovery

AC Input Voltage Low Automatic Shutdown and Recovery

3-2

3.2.1.4 Adjustments

Table 9 displays the adjustments.

Table 9 Adjustments

Test Points (I+,I-) Current

Float Voltage (FLO) Variable Resistor or Setting on ALU

Current Limit (CL) Variable Resistor or Setting on ALU

3.2.2 Environmental

Table 10 displays the environmental specifications.

Table 10 Environmental Specifications

DELTA MCS-1800 3U Power Sh

Installation, Operations and

Maintenance Manual

Adjustment Description

Specification Value

elf

Operating temperature

Storage temperature

32 to +122℉ (0℃ to +50℃) OPTION

-40 to +185℉ (-40℃ to +85℃)

Humidity 0% to 95% Relative Humidity No condensing

Altitude -5.2”/132mm

Weight 3.3 Kg (7.26 lbs.)

EMI/FRI suppression Conforms to EN 55022, BS 6527 FCC Part 15 Subpart J,

and CISPR 22 Class A

Current harmonic Conforms to EN 61000-3-2/A12, EN 60555-2, IEC

1000-3-2 Class A

Voltage fluctuation Conforms to EN 61000-3-3M, EN 60555-3

Electrostatic discharge Conforms to EN 61000-4-2, IEC 1000-4-2, IEC 801-2

Level 4

Radiated susceptibility Conforms to IEC 1000-4-3, IEC 801-3 Level 3

Electrical fast transients Conforms to EN 61000-4-4, IEC 1000-4-4, IEC 801-4

Level 4

Conducted susceptibility Conforms to IEC 1000-4-6 Level 3

Lightning/surge Conforms to ANS/IEEE C62.41.-1, 1991 B3, IEC

1000-4-5 Level Special (6KV)

Safety Meets IEC 950, EN60950, UL/CUL/CE Approval

MTBF >150 K hours

Cooling Fan cooling

Heat dissipation

682 BTU/hour max. per module (-48V Version) 698 BTU/hour max. per module (+24V Version)

3-3

3.2.3 Status/Alarm Indicators

Table 11 displays the status alarm indicators

Table 11 Status Alarm Indicators

Indicator Color Function Description

LED Amber CL Current Limit

LED Green AC AC ON

LED Red RFA Rectifier Failure Alarm

3.2.4 Mechanical Data

Table 12 displays the rectifier mechanical data.

Table 12 Rectifier Mechanical Data

DELTA MCS-1800 3U Power Sh

Installation, Operations and

Maintenance Manual

elf

Dimension Value

Height 5.2 in. (132mm)

Depth 10.35 in. (263mm)

Width 3.3 in. (83.6mm)

3.3 Operation and Adjustment

All operating adjustments are made at the front panel of each rectifier. The following components are

located on each rectifier panel:

1. Float voltage adjustment

2. Current limit adjustment

3. Current test points

4. Alarm indicators

Figure 3 shows different indicators and adjustment points on this unit.

Rectifier adjustments must be done sequentially from the first through the fourth rectifier with AC applied.

All adjustments must be made with no load, and the batteries disconnected to ensure adjustment accuracy.

3.3.1 Start-Up

To start up the system, perform the following steps:

1. Aproximately 3 to 8 seconds after the AC applied, the RFA LED extinguishes.

3.3.2 Float Voltage Adjustment

Verify the required float voltage setting per battery manufacturer specification. If the factory setting differs from the battery manufacturer recommended setting, the ALU float voltage parameter and each rectifier’s float voltage must be adjusted to the new setting. A digital multimeter and a small screwdriver are required to perform this procedure. Located the float voltage access point (FL) at the front of the rectifier.

To adjust the float voltage, perform the following steps:

1. Remove the ALU.

3-4

2. Place the digital multimeter probe in the V+ and V- output voltage connecter.

3. Adjust the float voltage by using a screwdriver to turn the FL point to the voltage value as shown on the meter. The tolerance error should not exceed 0.02V.

Notes:

1. Turning the variable resistor adjustment point clockwise increases the value, and counterclockwise

2. Refer to Figure 3 (rectifier front view) for the location of V+, V- and FL point.

3. When the setting is completed, temperature and voltage compensation must be reset to the default value.

3.3.3 Current Limit Setting

Warning: Current limit setting is not intended to be adjusted in the field. Users should only use it for

their reference.

Current limit adjustment is made by turning the CL variable resistor with the digital multimeter probes in the I+, I- test points. This current limit is set at the factory. The factory setting is always the maximum value of 110%. For a 48V/30 Amp rectifier, the computation for the current limit is

1.1×30=33 Amps.

The following adjustment procedure is for reference only:

1. At the rectifier, place the digital multimeter probes in the I+, I- test points.

2. Place a small screwdriver in the CL adjustment point.

3. Turn the variable resistor counterclockwise to increase the value. Turn the variable resistor clockwise to decrease the current limit value.

DELTA MCS-1800 3U Power Sh

Installation, Operations and

Maintenance Manual

elf

3.4 System Alarm

During an alarm condition, the faulty rectifier illuminates its RFA light on the front panel. The rectifier fail alarm signal is sent to the ALU, which processes the alarm, closes the RFA alarm contacts, and lights the alarm LEDs.

3.5 PSU Block Diagram

Refer to Figure 5.

3.6 PSU Operating Principle

After applying the incoming line voltage to the rectifier, current is applied to the EMI filter and circulates through protection components such as the AC circuit breaker and the fuse. The major functions of the protection devices are to prevent the rectifier from being damaged by surge voltage, to efficiently reduce the noise of differential mode and common mode, to eliminate the high frequency noise from input current, and to prevent noise reverse to the source circuit.

The AC input voltage is rectified and converted to a 400VDC bus through a PFC boost stage. This PFC stage maintains the Power Factor at >.99 and the Total Harmonic Distortion (THD) at <5%.

The 400 VDC bus voltages is modulated at a frequency higher than 100KHz and stepped down through a transformer. Output of this transformer is rectified and filtered to provide the output DC voltage.

3-5

DELTA MCS-1800 3U Power Shelf

Installation, Operations and

Maintenance Manual

4 Alarm Control Unit

4.1 Description

The Alarm Control Unit (ALU) with RS232 & LAN interface and remote monitoring function provides output alarms, alarm threshold adjustments, float and equalize voltage adjustments, temperature compensation voltage settings, low voltage disconnect voltage threshold settings, an equalize charge timer, and system alarm LEDs. In addition, the ALU automatically derates the system output current according to the following table:

Figure 2 shows a front view of Alarm control unit.

Table 13 Voltage Ranges

Input Voltage Range Output

90-150 VAC 50%

150-175 VAC 80%

176-275 VAC 100%

The module is hot swappable.

4.2 Specifications

4.2.1 Input Characteristics

Table 14 displays the input characteristics.

Table 14 Input Characteristics

Characteristic Value

Input Voltage Range

Input Current <0.5 Amps

4.2.2 Push Buttons

This alarm unit has 3 push buttons on the front panel. These push buttons are used to control the

alarm unit. Following are possible functions these buttons will act:

Control

- FL/EQU

- HVSD RST

- SMR RST

- Voltage/Current Display

40V to 59.5V for 48V system

20V to 30V for 24V system

4-1

DELTA MCS-1800 3U Power Shelf

Settings Description

FL/EQU

- Function

HVSD RST

- Function

SMR RST

- Function

Voltage/Current

- Function

Notice: When SMR turn off , the system will detect RFA warning in ES48/90-JFAxx.

When SMR vacant , the system will detect RFA warning in other system.

4.2.3 Indicators

Table 15 displays the ALU indicators.

- This button is used to manually select SMR into float or equalize state.

- When SMRs shut down resulting from DC high voltage. This button is used to reset alarm state.

System will detect RFA warning when SMRs are vacant or turned off. However, if the button is pushed at this time, the system will stop sending the warning.

This button is used to change the voltage or current of LED display.

Installation, Operations and

Maintenance Manual

Table 15 ALU Indicators

Indicator Color Function Description

LED1 Green FL System Float State

LED2 Yellow EQU System Equalize State

LED3 Red HV DC High Voltage Alarm-Minor

LED4 Red LV DC Low Voltage Alarm-Minor

LED5 Yellow MIN System Minor Alarm

LED6 Red MAJ System Major Alarm

LED7 Red HVSD High Voltage Shutdown (DC)

LED8 Red AC FAIL Loss of AC Input

LED9 Red FUSE ALM DC Output or Breaker SW. Trip

LED10 Red LVDS OPEN Low Voltage Disconnect Open

4.2.4 Relay Output

Table 16 displays the relay output.(Please refer to Figure 5)

Table 16 Relay Output

Relay Function Description Relay Function Description

Relay1 ACF AC Failure Relay5 LV

Relay2 MAJ Major Alarm Relay6 LVD

Relay3 HVSD High Voltage Shutdown Relay7 FA

Relay4 HV

DC High Voltage Alarm-Minor

DC Low Voltage Alarm-Minor Low Voltage Disconnect Open Breaker Trip Alarm

Relay8 MIN Minor Alarm

4-2

4.2.5 ALU Alarm Signal Descriptions

MAJ: Major Alarm

(1) 2 or above rectifiers fail.

(2) Temperature sensor disconnects.

(3) AC Low Voltage Alarm.

(4) AC High Voltage Alarm.

(5) LVDS Trip Alarm. (System equipped with PDU)

(6) Battery or Ambient over temperature. (System equipped with PDU)

(7) HVSD Alarm.

(8) Breaker Trip Alarm.

MIN: Minor Alarm

(1) One rectifier fail.

(2) Current Limit Alarm.

(3) DC High Voltage Alarm.

(4) DC Low Voltage Alarm.

DELTA MCS-1800 3U Power Shelf

Installation, Operations and

Maintenance Manual

HV: The alarm condition exists when the DC output voltage is higher than the parameter setting.

LV: The alarm condition exists when the DC output voltage is lower than the parameter setting.

AC Fail: The alarm condition exists when the AC voltage is absent.

LVDS: The alarm condition exists when the DC output voltage is lower than the threshold voltage.

(System equipped with PDU)

Fuse Fail: The alarm condition exists when the battery switch trip off or the DC Load output switch trip off.

4.2.6 Physical

Table 18 displays the ALU mechanical data.

Table 18 ALU Mechanical Data

Dimension Value

Height 5.2 in. (132mm)

Depth 9.9 in. (251.3mm)

Width 1.9 in. (46.2mm)

4-3

Delta MCS-1800 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual