background image

I.B. ATS-SD02

Page 21

Effective 5/98

SECTION 5: OPERATION

5.1  GENERAL

A transfer switch provides main contacts to connect and
disconnect the load to and from the normal and emer-
gency power sources (Paragraph 3.2.1). A stored-energy
type transfer mechanism provides the mechanical motion
required to open and close the mechanically interlocked
main contacts (Paragraph 3.2.4 and Figure 3-2). 

Each switch can be manually operated. Before a switch-
ing device can be closed, the stored energy mechanism
must be charged by pumping the handle (Figure 5-1).
The switching device can be closed by pushing the
close button (Figure 5-2). The other switching device is
prevented from closing through a rigid mechanical inter-
lock (Paragraph 3.2.2). An indicator window shows
whether the switch is open or closed.

If a transfer switch with any type of electrical operat-
ing capabilities is to be operated manually utilizing
the manual operating handle, it is strongly recom-
mended that the transfer control circuit first be iso-
lated. This is accomplished by disconnecting the
logic panel. If, however, a transfer switch is sup-
plied with a four-position selector switch (Option
6H), it can be turned to the off position, making it
unnecessary to unplug the logic. In the case of the
automatic transfer switch design, any attempt to
operate the manual handle without first isolating the
control circuit causes an automatic transfer.

5.2  AUTOMATIC TRANSFER SWITCH

The operating sequence of an automatic transfer switch
is dictated by the switch’s standard features and select-
ed options. Operation of an automatic transfer switch
during normal power source failure and normal power
source restoration will be described here with only stan-
dard options included on the switch. Additional options,
as described in Section 3 or in separate instruction doc-
uments, can change sequences and timing depending
upon the options selected. Become familiar with any
additional options selected and their effect on the nor-
mal operation of an automatic transfer switch.

Normal Power Source Failure 

Standard normal power source failure is defined as a
reduction or loss of voltage. If this occurs, the sequence
of operation is as follows:

·

Failure of the normal power source is detected by 
the logic.

·

When the intelligence circuit detects a failure, the 
normal relay drops out, opening certain contacts 
while closing others. One of the contacts starts the 
engine-driven generator.

·

When the emergency power source voltage reaches
its operation rating, an emergency relay closes, 
starting the transfer operation. This operating 
sequence opens the normal switching device and 
closes the emergency switching device.

·

The load is now transferred to emergency power 
source.

Figure 5-1  Pumping Handle Charges Stored Energy
Mechanism

Figure 5-2  Close Switch by Pushing Close Button

NOTICE

Содержание ATVISPE31000XSU

Страница 1: ...I B ATS SD02 Effective 5 98 Replaces I B ATS SDO1 dated October 1996 Cutler Hammer Instructions for Cutler Hammer Drawout Transfer Switch and Bypass Isolation Switch...

Страница 2: ......

Страница 3: ...THAT CAN CAUSE DEATH OR SEVERE PERSONAL INJURY FOLLOW PROPER INSTALLATION OPERATION AND MAINTENANCE PROCEDURES TO AVOID THESE VOLTAGES WARNING TRANSFER SWITCH EQUIPMENT COVERED BY THIS INSTRUCTION BOO...

Страница 4: ...T DESCRIPTION 3 1 General 7 3 2 Power Panel 7 3 2 1 Main Contacts 7 3 2 2 Switch Interlocks 8 3 2 3 Drawout Interlocks 8 3 2 4 Transfer Mechanism 9 3 2 5 Drawout Mechanism 9 3 3 Voltage Selection Pane...

Страница 5: ...Bypass 26 7 3 3 Normal to Emergency Bypass 29 7 3 4 Emergency to Normal Bypass 29 7 4 Manual Operation when in Bypass Mode 30 7 4 1 Normal Bypass to Emergency Bypass 30 7 4 2 Emergency Bypass to Norm...

Страница 6: ...r Switch NEMA 1 Enclosure 16 4 3 Side View and Rear View of Power Panel 18 4 4 Drawout Stationary 20 4 5 Seismic Tested and Approved Product Mounting Instructions 19 4 6 Secondary Control Block Contac...

Страница 7: ...FAMILIARIZE PERSON NEL WITH THE STYLE OF PRESENTATION THIS WILL HELP TO INSURE THAT PERSONNEL ARE ALERT TO WARNINGS WHICH APPEAR THROUGH OUT THE DOCUMENT IN ADDITION CAUTIONS ARE ALL UPPER CASE AND B...

Страница 8: ...cal operation feature is added The switch electrically transfers power when an appropriate pushbutton on the front of the enclosure is pushed If necessary the switch can also be operated manually In a...

Страница 9: ...e Rating Type kA 800 100 100 85 2000 L 200 1000 100 100 85 2000 L 200 1200 100 100 85 2000 L 200 1600 100 100 85 3000 L 200 2000 100 100 85 3000 L 200 2500 100 100 85 4000 L 200 3000 100 100 85 4000 L...

Страница 10: ...ment catalog numbers provide a significant amount of relevant information that pertains to a particular piece of equipment The catalog number identification table Table 1 2 provides the required inter...

Страница 11: ...e Enclosure Arrangement of Poles Rating Frequency Type Listing Drawout Insulated Case E Two 2 0600 120VAC 60Hz A No Enclosure K UL Listed U Switches both Sources Three 3 0800 208VAC 60Hz B Type 1 S Fo...

Страница 12: ...not discard the packing material until the equipment is ready for installation A plastic bag of documents will be found within the enclosure usually attached to the inside of the door Important docume...

Страница 13: ...tion Panel Logic Panel IQ Transfer Solid State The components comprising the three panels are installed in accordance with the specific requirements of the circuit being controlled Each transfer switc...

Страница 14: ...mechanically interlocked to the drawout mechanism to ensure that the switching device is always open when connecting or disconnecting it from the line and load stabs LIFTING THE PADLOCK LATCH WHILE A...

Страница 15: ...chanism The switching device is closed by energizing a solenoid that releases the spring mechanism A shunt trip will open the switching device if energized 3 2 5 DRAWOUT MECHANISM The drawout mechanis...

Страница 16: ...scription More detailed selections that must be made within a specific option are lettered For available options associated with the logic scheme refer to the specific logic document associated with t...

Страница 17: ...IQ Analyzer Emergency Only Q IQ Analyzer Both N E Selectable R DP 4000 Normal Only S DP 4000 Emergency Only T DP 4000 Both N E Selectable 20A Rear Bus Connections Solderless lugs are furnished as stan...

Страница 18: ...y of lights switches and pushbuttons depending upon the options required for a particular switch All switch doors are supplied with a heavy duty plastic accessory panel in place whether or not externa...

Страница 19: ...rogram which requires an extensive follow up testing program for listed devices Standard UL1008 for automatic transfer switches lists devices under the re examination program which only requires a con...

Страница 20: ...d to retard the action of relays or cover the logic in a way that restricts adjustments Maintain proper electrical clearances between live metal parts and grounded metal For installation and maintenan...

Страница 21: ...ergency Power Cable Connections Normal Power Cable Connections Emergency Power Cable Connections Neutral Cable Connection Grounding Right hand side when facing front switch F I G H F I G H Transfer Di...

Страница 22: ...152 4 23 24 59 0 30 00 76 2 23 24 59 0 28 44 72 2 3400 1542 4 Pole 800 2000A 68 00 172 7 60 00 152 4 29 24 74 3 30 00 76 2 29 24 74 3 28 44 72 2 4000 1814 3 Pole 2500 3000A 82 00 208 3 60 00 152 4 29...

Страница 23: ...plate on the intelli gence panel of transfer switch agree with sys tem current and voltage Step 3 After the transfer switch is mounted provide conduit or cable openings as required Ensure that no meta...

Страница 24: ...R SELECTION AND OR CONNECTION COULD RESULT IN EQUIPMENT DAMAGE 4 6 MOUNTING SWITCHING DEVICE IN THE DRAW OUT MECHANISM When mounting the switching device in the drawout mechanism ensure that the exten...

Страница 25: ...cleats must be ATVISP NTVSSP Figure 4 5 Seismic Tested and Approved Product Mounting Instructions Switch Type Amp Rating Mounting Bolt Torque ATVSSP 600 4000A 50 ft lbs 68 Nm NTVSSP 500 4000A 50 ft l...

Страница 26: ...es up correctly with the indexing lever 4 7 WIRING POWER CONDUCTORS AND CONTROL WIRING MAY HAVE VOLTAGE PRESENT THAT CAN CAUSE SEVERE PERSONAL INJURY OR DEATH DE ENERGIZE ALL POWER OR CONTROL CIRCUIT...

Страница 27: ...e manual handle without first isolating the control circuit causes an automatic transfer 5 2 AUTOMATIC TRANSFER SWITCH The operating sequence of an automatic transfer switch is dictated by the switch...

Страница 28: ...ltage the logic causes the normal relay to pickup The normal relay closes certain contacts while opening others This starts the return to the normal power source and normal transfer switch operation D...

Страница 29: ...CE IS IN THE CONNECTED POSITION The switching device will not close in the WITHDRAWN position 6 2 SWITCH POSITION The drawout mechanism has four positions They are achieved by lifting the padlock latc...

Страница 30: ...H TO SER VICE WITHOUT INSTALLING THE DEADFRONT SHIELD Return the switching device to the desired position Replace the deadfront shield when the switch is in the DISCONNECT position 6 4 OPERATIONAL CHE...

Страница 31: ...e causing the transfer switch to start the transfer sequence If the push button is held down the transfer switch will transfer the load to the emer gency switch Releasing the button will restore regu...

Страница 32: ...sed light will no longer be illuminated 9 Remove the key from the normal bypass switch by turning the key counterclockwise while pushing up on the lever next to the key interlock This will lock the no...

Страница 33: ...0 Operational High Load Communications Trip Time Overcurrent Curve Shape Pickup x In Time Multiplier Pickup x In Time Program Phase Ground I I I RMS Amperes Settings Test Time Trip Cause Test Program...

Страница 34: ...000 Operational High Load Communications Trip Time Overcurrent Curve Shape Pickup x In Time Multiplier Pickup x In Time Program Phase Ground I I I RMS Amperes Settings Test Time Trip Cause Test Progra...

Страница 35: ...k the emergency bypass switching device to prevent it from closing 10 Insert the key in the normal switching device and turn the key clockwise which will release the lever to the left of the key inter...

Страница 36: ...ing 3 Insert the key in the emergency bypass switching device and turn it clockwise to release the lever to the left of the key interlock This will unlock the emergency bypass switching device 4 Open...

Страница 37: ...OBLEM SOLV ING ONLY PROPERLY TRAINED PERSONNEL FAMILIAR WITH THE TRANSFER SWITCH EQUIPMENT AND ITS ASSOCIATED EQUIPMENT SHOULD BE PERMIT TED TO PERFORM THE PROBLEM SOLVING FUNC TION IF AN INDIVIDUAL D...

Страница 38: ...A2 on the normal switching device spring release coil Does the voltage measure 120 VAC 10 volts Record reading If YES Check spring release coil in normal switching device If NO Check wiring to A1 and...

Страница 39: ...ion by this type of equipment inspection and maintenance checks should be made on a regularly scheduled basis Since equipment maintenance will consist mainly of keeping the equipment clean the frequen...

Страница 40: ...ity c Inspect switching devices for dust dirt soot Remove dust dirt soot grease moisture and corrosion grease moisture or corrosion contamination from the surface of the switching device using a dry s...

Страница 41: ...I B ATS SD02 Page 35 Effective 5 98...

Страница 42: ...I B ATS SD02 Page 36 Effective 5 98...

Страница 43: ......

Страница 44: ...tract between the purchaser and Cutler Hammer NO WARRANTIES EXPRESSED OR IMPLIED INCLUDING WARRANTIES OF FITNESS FOR A PAR TICULAR PURPOSE OR MERCHANTABILITY OR WARRANTIES ARISING FROM COURSE OF DEAL...

Отзывы: