Westinghouse 30-471 (E), Operation And Maintenance Manual, Page: 13 / 14

Instruction Leaflet
30-471 (E)
Page 13
Replacing Parts
The Robonic Automatic Transfer Switch has been designed to have all
components accessible and readily removable from the front of the
panels. The Robonic Transfer Switch is divided into two basic sections.
The upper section consists of the main contacts and transfer mechanism,
the lower section consisting of all the automatic control devices.
Caution
When replacing any parts of the mechanism, control transformers or
breakers, isolate the Robonic Transfer Switch from any possible source
of power.
To remove the transfer mechanism of the LRO transfer switch, first
open the cover and remove the slide pin from the operating cam, then
remove the centre bolt, the mechanism will lift straight off. The breakers
and transfer motor bracket are held by four screws for ease of removal
and replacement. When replacing the mechanism, first set it on the
Robonic with the breaker handles in the holes provided and then fasten
the centre bolt reasonably tight with the mechanism fully movable with
an equivalent swing distance up and down.
To remove the transfer mechanism of the RO transfer switch, remove
the four bolts holding it, taking note of which holes the bolts were in,
then lift the mechanism straight off. The breakers are held by two bolts
at one end and the bus connectors on the other end. The transfer motor
is mounted to the transfer mechanism cover and centre drive gear.
When replacing any part of the transfer mechanism, be sure that the
scribe lines of the gears are in a straight row (example shown on page 6).
To prevent operation of the transfer switch while replacing mechanism
or components, disconnect all sources of power.
When replacing the mechanism move it about until the breaker toggles
fit between the mechanism fingers and then fasten the bolts tightly. To
test for proper operation first operate manually and then connect 120
volt, 60 Hertz supply to motor leads and observe operation for free
movement and proper breaker operation.
The PRO transfer switch mechanism is similar to the RO with the
exception that the PRO mechanism has five gears and is mounted
horizontally. The breakers are fastened to the panel by six bolts.
All Robonic transfer switch breakers and mechanisms have allowed
some adjustments for mounting to assure proper operation without
slipping or binding. Be sure all hardware is tightened sufficiently before
re-energizing any transfer switch.
To replace any of the octal plug-ins relays, pull old units straight out
and insert the replacement unit. Due to the tight fit of the receptacle
and pins, you may have to move the relay about a little to pull it out.
DO NOT INTERCHANGE ANY RELAY WITH ANY OTHERS.
To replace any solid state logic modules, pull straight out and insert the
replacement unit.
Parts List
Part Name Style No.
Parts Common to Robonic II
Plug-in Modules
Timer,1-60 sec. adjustable, for TDEN,TDEC,TDNE 1275C74G01
Timer,0.1-10 min. adjustable, for TDEN,TDEC,TDNE 1275C74G01
Timer,0.2-30 min. adjustable, for TDEN,TDEC,TDNE 1275C74G03
Timer, 5 min. adjustable, for TDEN,TDEC,TDNE
1275C74G08
Relay driver — used in place of timers, for
instantaneous operation
1266C77G02
Instantaneous relay, used for NR,ER and EC 1Ø
under frequency module, for “normal” or “emergency 1275C74G04
1Ø over frequency module, for “normal” or “ermergency” 1275C74G06
3Ø over voltage module, for “normal” or “emergency” 1266C79G01
1Ø over voltage module, for “normal” or “emergency” 1266C79G02
3Ø under voltage module, for “normal” or “emergency” 1266C79G03
1Ø under voltage module, for “normal” or “emergency” 1266C79G04
Blank cover, for unused module space
1266C77G01
Time delay relay for engine starting, 2.5s fixed 3152A51H01
Time delay relay for engine starting, adjustable 1-300s 688A886H11
Options
Plant Exerciser 688A888G01
Battery Charger 12V 1259C26G01
Battery Charger 24V 1259C26G03
4 Position s/s fixed 7070A56H01
4 Position s/s keyed 7070A56H02
Transformer Modules Standard Optional
600V, for LRO, RO 160D997G05 160D997G15
480V, for LRO, RO 160D997G04 160D997G14
416V, for LRO, RO 160D997G03 160D997G13
240V, for LRO, RO 160D997G02 160D997G12
208V, for LRO, RO 160D997G01 160D997G11
600V, for PRO 160D997G10 160D997G20
480V, for PRO 160D997G09 160D997G19
416V, for PRO 160D997G08 160D997G18
240V, for PRO 160D997G07 160D997G17
208V, for PRO 160D997G06 160D997G16
For Type LRO Robonic II
Mechanism 833C222G02
Motor Assembly 833C223G01
Motor 688A732H02
Operating Cam 688A458G01
Slide Pin 688A731H01
Limit Switch 688A747H01
For Type RO Robonic II
Mechanism 150 to 400A 833C226G01
Mechanism 600 to 1000A 833C226G01
Motor 688A749H01
Solenoid 688A740H01
Brake Shoe Assembly 688A738G01
Operating Cam 572B774H01
Auxiliary & Limit Switch 688A747H01
For Type PRO Robonic II
Mechanism 688A109G01
Motor 688A749H02
Solenoid 688A740H01
Auxiliary & Limit Switch 688A747H01