Siemens SR200R, SR100R User Manual

Automatic Transfer Switch
Owner’s Manual
ATS “HS” Type
Models: SR200R
(200 Amp, 250 Volts)
and SR100R
s
(100 Amp, 250 Volts)
This manual should remain with the unit.
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS! Read the following information carefully before attempting
to install, operate or service this equipment. Also read the instructions and information on
tags, decals, and labels that may be affixed to the transfer switch. Replace any decal or label that is no longer legible.
DANGER! Connection of a generator to an electrical system normally supplied by an electric
utility shall be by means of suitable transfer equipment so as to isolate the electric system
from utility distribution system when the generator is operating (Article 701 Legally Required Standby Systems or Article 702 Optional Standby Systems, as applicable). Failure to isolate elec­tric system by these means may result in damage to generator and may result in injury or death to utility workers due to backfeed of electrical energy.
 
Every possible circumstance that might involve a hazard cannot be anticipated. The warnings in this manual, and on tags and decals affixed to the unit are, therefore, not all-inclusive. If using a procedure, work method or operating technique the manufac­turer does not specifically recommend, ensure that it is safe for others. Also make sure the procedure, work method or operating technique utilized does not render the transfer switch unsafe.
Throughout this publication, and on tags and decals affixed to the generator, DANGER, WARNING, CAUTION and NOTE blocks are used to alert person­nel to special instructions about a particular opera­tion that may be hazardous if performed incorrectly or carelessly. Observe them carefully. Their defini­tions are as follows:
DANGER
After this heading, read instructions that, if not
strictly complied with, will result in personal inju­ry, including death, or property damage.
After this heading, read instructions that, if not
strictly complied with, may result in personal injury or property damage.
After this heading, read instructions that, if not
strictly complied with, could result in damage to equipment and/or property.
NOTE:
After this heading, read explanatory statements
that require special emphasis.
These safety warnings cannot eliminate the hazards that they indicate. Common sense and strict compli­ance with the special instructions while performing the service are essential to preventing accidents.
Four commonly used safety symbols accompany the DANGER, WARNING and CAUTION blocks. The type of information each indicates follows:
This symbol points out important safety informa-
tion that, if not followed, could endanger personal safety and/or property.
This symbol points out potential explosion hazard.
This symbol points out potential fire hazard.
This symbol points out potential electrical shock
hazard.
GENERAL HAZARDS
• Any AC generator that is used for backup power if a NORMAL (UTILITY) power source failure occurs, must be isolated from the NORMAL (UTILITY) power source by means of an approved transfer switch. Failure to properly isolate the NORMAL and STANDBY power sources from each other may result in injury or death to electric utility workers, due to backfeed of electrical energy.
• Improper or unauthorized installation, operation, service or repair of the equipment is extremely dangerous and may result in death, serious per­sonal injury, or damage to equipment and/or per­sonal property.
• Extremely high and dangerous power voltages are present inside an installed transfer switch. Any contact with high voltage terminals, contacts or wires will result in extremely hazardous, and pos­sibly LETHAL, electric shock. DO NOT WORK ON THE TRANSFER SWITCH UNTIL ALL POWER VOLTAGE SUPPLIES TO THE SWITCH HAVE BEEN POSITIVELY TURNED OFF.
• Competent, qualified personnel should install, operate and service this equipment. Adhere strictly to local, state and national electrical and building codes. When using this equipment, comply with regulations the National Electrical Code (NEC), CSA Standard; C22.1 Canadian Electric Code and Occupational Safety and Health Administration (OSHA) have established.
• Never handle any kind of electrical device while standing in water, while barefoot, or while hands or feet are wet. DANGEROUS ELECTRICAL SHOCK MAY RESULT.
Table of Contents
• Remove all jewelry (such as rings, watches, brace­lets, etc.) before working on this equipment.
• If work must be done on this equipment while standing on metal or concrete, place insulative mats over a dry wood platform. Work on this equipment only while standing on such insulative mats.
• Never work on this equipment while physically or mentally fatigued.
• Keep the transfer switch enclosure door closed and bolted at all times. Only qualified personnel should be permitted access to the switch interior.
• In case of an accident caused by electric shock, immediately shut down the source of electrical power. If this is not possible, attempt to free the victim from the live conductor but AVOID DIRECT CONTACT WITH THE VICTIM. Use a nonconduct­ing implement, such as a dry rope or board, to free the victim from the live conductor. If the victim is unconscious, apply first aid and get immediate medical help.
• When an automatic transfer switch is installed for a standby generator set, the generator engine may crank and start at any time without warning. To avoid possible injury that might be caused by such sudden start-ups, the system’s automatic start cir­cuit must be disabled before working on or around the generator or transfer switch. Then place a “DO NOT OPERATE” tag on the transfer switch and on the generator. Remove the Negative (Neg) or (–) bat­tery cable.
Safety Rules .........................................Inside Front Cover
Section 1 — General Information ...................................2
1.1 Introduction............................................................. 2
1.2 Equipment Description ........................................... 2
1.3 Transfer Switch Data Decal ..................................... 2
1.4 Transfer Switch Enclosure ...................................... 2
1.5 Safe Use Of Transfer Switch .................................... 2
Section 2 — Installation ....................................................3
2.1 Introduction to Installation ...................................... 3
2.2 Unpacking ............................................................... 3
2.3 Mounting ................................................................. 3
2.4 Connecting Power Source and Load Lines ............... 3
2.4.1 2-Pole Mechanism ......................................... 3
2.5 Connecting Start Circuit Wires ................................ 4
Section 3 — Operation .......................................................4
3.1 Functional Tests & Adjustments .............................. 4
3.2 Manual Operation .................................................... 4
3.2.1 Close to Normal Source Side ........................ 4
3.2.2 Close to Emergency Source Side ................... 5
3.2.3 Return to Normal Source Side ...................... 5
3.3 Voltage Checks ......................................................... 5
3.4 Generator Tests Under Load ................................... 6
Section 4 – Notes ...............................................................7
Section 5 – Installation Diagram ..................................10
Section 6 – Electrical Data .............................................11
Section 7 – Exploded Views & Parts Lists ..................14
Section 8 – Warranty/Service ....................... Back Cover
For authorized service,
reference the dealer locator
number found inside the
generator owner’s manual.
1
Section 1 — General Information
“HS” Type Transfer Switch
1.1 INTRODUCTION
This manual has been prepared especially for the purpose of familiarizing personnel with the design, application, installation, operation and servicing of the applicable equipment. Read the manual carefully and comply with all instructions. This will help to prevent accidents or damage to equipment that might otherwise be caused by carelessness, incorrect appli­cation, or improper procedures.
Every effort has been expended to make sure that the contents of this manual are both accurate and cur­rent. The manufacturer, however, reserves the right to change, alter or otherwise improve the product at any time without prior notice.
1.2 EQUIPMENT DESCRIPTION
The automatic transfer switch is used for transfer­ring electrical load from a UTILITY (NORMAL) power source to a EMERGENCY ( STANDBY) power source. Such a transfer of electrical loads occurs automati­cally when the UTILITY power source has failed or is substantially reduced and the EMERGENCY source voltage and frequency have reached an acceptable level. The transfer switch prevents electrical feedback between two different power sources (such as the UTILITY and EMERGENCY sources) and, for that reason, codes require it in all standby electric system installations.
The transfer switch consists of a transfer mechanism, a relay control, and a terminal strip for connection of sensing wires.
This switch is suitable for control of motors, electric discharge lamps, tungsten filament and electric heat­ing equipment and the tungsten load does the switch rating.
The transfer switch is for use in optional standby systems only.
The transfer switch is suitable for use on a circuit capable of 10,000 rms symmetrical amperes, 240 VAC when protected by a circuit breaker without an adjustable short time response or by fuses.
1.3 TRANSFER SWITCH DATA DECAL
A DATA DECAL is permanently affixed to the transfer switch enclosure. Use this transfer switch only with the specific limits shown on the DATA DECAL and on other decals and labels that may be affixed to the switch. This will prevent damage to equipment and property.
When requesting information or ordering parts for this equipment, make sure to include all information from the DATA DECAL.
Record the Model and Serial numbers in the space provided below for future reference.
MODEL #
SERIAL #
1.4 TRANSFER SWITCH ENCLOSURE
The standard switch enclosure is a National Electrical Manufacturer’s Association (NEMA) 3R type. NEMA 3R type enclosures primarily provide a degree of pro­tection against falling rain and sleet and is not dam­aged by the formation of ice on the enclosure.
1.5 SAFE USE OF TRANSFER SWITCH
Before installing, operating or servicing this equip­ment, read the SAFETY RULES (inside front cover) carefully. Comply strictly with all SAFETY RULES to prevent accidents and/or damage to the equipment. The manufacturer recommends that a copy of the SAFETY RULES are posted near the transfer switch. Also, be sure to read all instructions and information found on tags, labels and decals affixed to the equip­ment.
Two publications that outline the safe use of transfer switches are the following:
• NFPA 70; National Electrical Code
• UL 1008, STANDARD FOR SAFETY-AUTOMATIC TRANSFER SWITCHES
2
2.1 INTRODUCTION TO INSTALLATION
This equipment has been wired and tested at the factory. Installing the switch includes the following procedures:
• Mounting the enclosure.
• Connecting power source and load leads.
• Connecting the generator start circuit.
• Connecting any auxiliary contact (if needed)
• Testing functions.
Section 2 — Installation
“HS” Type Transfer Switch
2.4.1 2-POLE MECHANISM
These switches (Figure 2.1) are used with a single­phase system, when the single-phase NEUTRAL line is to be connected to a Neutral Lug and is not to be switched.
Figure 2.1 — Typical 2-Pole Transfer Mechanism
(200 Amp Shown)
UTILITY LUGS
2.2 UNPACKING
Carefully unpack the transfer switch. Inspect closely for any damage that might have occurred during ship­ment. The purchaser must file with the carrier any claims for loss or damage incurred while in transit.
Check that all packing material is completely removed from the switch prior to installation.
2.3 MOUNTING
Mounting dimensions for the transfer switch enclo­sure are in this manual. Enclosures are typically wall-mounted. See the “Installation Diagram”.
Handle transfer switches carefully when install-
ing. Do not drop the switch. Protect the switch against impact at all times, and against construc­tion grit and metal chips. Never install a transfer switch that has been damaged.
Install the transfer switch as close as possible to the electrical loads that are to be connected to it. Mount the switch vertically to a rigid supporting structure. To prevent switch distortion, level all mounting points. If necessary, use washers behind mounting holes to level the unit.
2.4 CONNECTING POWER SOURCE AND LOAD LINES
DANGER
Make sure to turn OFF both the UTILITY
(NORMAL) and EMERGENCY (STANDBY) power supplies before trying to connect power source and load lines to the transfer switch. Supply volt­ages are extremely high and dangerous. Contact with such high voltage power supply lines will result in an extremely hazardous, possibly lethal, electrical shock.
Wiring diagrams and electrical schematics are pro­vided in this manual. Power source and load connec­tions are made at a transfer mechanism, inside the switch enclosure.
UTILITY CLOSING COIL
GENERATOR LUGS (E1 & E2)
GENERATOR CLOSING COIL
LOAD LUGS (T1 & T2)
Solderless, screw-type terminal lugs are standard.
Switch Wire Conductor Tightening Rating Range Torque
100A #14-1/0 AWG 50 in-lbs. 200A #6-250 MCM 275 in-lbs.
Conductor sizes must be adequate to handle the maximum current to which they will be subjected to, based on the 75°C column of tables, charts, etc. used to size conductors. The installation must comply fully with all applicable codes, standards and regulations.
Before connecting wiring cables to terminals, remove any surface oxides from the cable ends with a wire brush. All power cables should enter the switch next to transfer mechanism terminals. If ALUMINUM con­ductors are used, apply corrosion inhibitor to con­ductors. Tighten terminal lugs to the torque values as noted on the decal located on the inside of the door. After tightening terminal lugs, carefully wipe away any excess corrosion inhibitor.
All power cables should enter the switch next to the transfer mechanism terminals.
Use a torque wrench to tighten the conductors,
being sure not to over tighten, or damage to the switch base could occur. If not tightened enough, a loose connection would result, causing excess heat which could damage the switch base.
3
Section 3 — Operation
“HS” Type Transfer Switch
Connect power source load conductors to clearly marked transfer mechanism terminal lugs as fol­lows
1. Connect UTILITY (NORMAL) power source cables
to switch terminals N1, N2.
2. Connect EMERGENCY (STANDBY) source power
cables to transfer switch terminals E1, E2.
3. Connect customer LOAD leads to switch termi-
nals T1, T2.
Conductors must be properly supported, of approved insulative qualities, protected by approved conduit, and of the correct wire gauge size in accordance with applicable codes.
Be sure to maintain proper electrical clearance between live metal parts and grounded metal. Allow at least 1/2 inch for 100-400 amp circuits.
2.5 CONNECTING START CIRCUIT WIRES
Control system interconnections (Section 6) consist of UTILITY 1 (N1) and UTILITY 2 (N2), LOAD 1 (T1) and LOAD 2 (T2), and leads 23 and 194 when used in conjunction with some water-cooled genera­tors. Recommended wire gauge sizes for this wiring depends on the length of the wire, as recommended below:
MAXIMUM WIRE LENGTH RECOMMENDED WIRE SIZE
460 feet (140m) No. 18 AWG. 461 to 730 feet (223m) No. 16 AWG. 731 to 1,160 feet (354m) No. 14 AWG. 1,161 to 1,850 feet (565m) No. 12 AWG.
NOTE:
If there are no matching terminal connections for LOAD 1 (T1) and LOAD 2 (T2) in the generator control panel, do not connect these wires. Failure of the control board will occur if connected.
Perform functional tests in the exact order pre-
sented in this manual, or damage could be done to the switch.
IMPORTANT: Before proceeding with functional tests, read and make sure all instructions and information in this section are understood. Also read the infor­mation and instructions of labels and decals affixed to the switch. Note any options or accessories that might be installed and review their operation.
3.2 MANUAL OPERATION
DANGER
Do NOT manually transfer under load.
Disconnect transfer switch from all power sourc­es by approved means, such as a main circuit breaker(s).
A manual HANDLE is shipped with the transfer switch. Manual operation must be checked BEFORE the transfer switch is operated electrically. To check manual operation, proceed as follows:
1. Turn the generator’s AUTO/OFF/MANUAL switch to OFF.
2. Turn OFF both UTILITY and EMERGENCY power supplies to the transfer switch, with whatever means provided (such as the main line circuit breakers).
3. Note position of transfer mechanism main con­tacts by observing the moveable contact carrier arm.
• Manual operation handle towards the top of switch mechanism - LOAD terminals (T1, T2) are connected to UTILITY terminals (N1, N2).
• Manual operation handle towards the bottom of switch mechanism - LOAD terminals (T1, T2) are connected to EMERGENCY terminals (E1, E2).
3.1 FUNCTIONAL TESTS AND ADJUSTMENTS
Following transfer switch installation and inter­connection, inspect the entire installation care­fully. A competent, qualified electrician should inspect it. The installation should comply strictly with all applicable codes, standards, and regula­tions. When absolutely certain the installation is proper and correct, complete a functional test of the system.
4
Do not use excessive force when operating the
transfer switch manually or damage could be done to the manual handle.
3.2.1 CLOSE TO NORMAL SOURCE SIDE
Before proceeding, verify the position of the switch by observing the position of manual operation handle in Figure 3.1. If the handle is UP, the contacts are closed in the NORMAL position, no further action is required. If the handle is DOWN, proceed with Step
1.
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