Programming instructions

- Page 5 -
IL 30-471 (E)
TYPE “SPB” ROBONIC
AUTOMATIC TRANSFER SWITCH
Rated 1200 amperes through 3000 amperes at 600 volts
Ac, 50 or 60 Hertz.
The SPB Automatic Transfer Switch consists of two basic
elements:
1. The power switching panel contains the main power
contacts and transfer mechanism. The main power
contacts connect and disconnect the load to and from
the sources of power. The transfer operation is ac-
complished by the electrically driven, stored energy
mechanism of the Systems Pow-R Devices.
2. The logic control panel provides the intelligence/su-
pervisory circuits which constantly monitor the condi-
tion of the power sources thus providing the intelli-
gence necessary for the operation of the transfer
switch.
The transfer mechanism is energized electrically from the
available source and both breakers read “charged” indi-
cating transfer switch is ready for transfer operation. The
transfer switch is prepared for the next operation after elec-
trical charging which takes only three seconds after trans-
fer. Manual charging is available if for any reason the
transfer switch is not energized. This is done by making
either four full strokes on the charging handle, or several
partial inching strokes. The transfer switch then can be
manually operated.
The switching devices are interlocked to prevent them from
being ep, closed at the same time. This is done by means
of two mechanical interlocks. Each interlock is connected
between the tripping (opening) mechanism of one device
and the latching (closing) mechanism of the other device.
Therefore if one device is closed its interlock will prevent
the other from latching and closing. Both devices cannot
be simultaneously connected to the load by either electri-
cal or manual means.
Auxiliary switches are used in remote control circuits for
interlocks, indicating lights, and signal contacts to indicate
the open or closed position of the breaker main contacts.
The type “SPB” transfer switch has three operating posi-
tions, the normal breaker closed and the emergency
breaker open, the emergency breaker closed and the nor-
mal breaker open or both the normal and the emergency
breakers open but never both the normal and emergency
breakers closed at the same time.
The type “SPB” Robonic Automatic Transfer Switch is also
easy to operate manually.
MANUAL OPERATION FROM NORMAL TO
EMERGENCY:
For SPB Automatic Transfer Switches with the four posi-
tion selector switch, isolate the transfer circuit and engine
starting circuit by placing the “FPSS” in the “OFF” posi-
tion.
For SPB Automatic Transfer Switches without the four
position selector switch, isolate the transfer circuit by dis-
connecting the two inter-connection plugs. Once that is
done, push the red “Pushto-Open” button on the Normal
Breaker (NB) to open the breaker, then push the green
“Push-to-Close” button on the Emergency Breaker (EB)
to close the breaker.
With normal source power available, the transfer switch
will return to normal when the “FPSS” is returned to the
“AUTO” position or when the two control plugs are re-con-
nected.
The various control components are described under the
section titled “Logic Control”.
Since type A Robonics employ magnetic only breakers,
their interrupting, closing and withstand ratings are the
same value. Under fault conditions, with its “normal”
breaker closed, a Robonic is required to withstand the
energy let through of the normal service protective device
while the fault is being cleared. At the same time, should
the normal voltage fall below the voltage sensing relay’s
selected value, - and if the alternate source were avail-
able, the Robonic could transfer before the normal serv-
ice protective device cleared the fault.
This would require that the Robonic be capable of inter-
rupting the protective device’s let through current. In ad-
dition, the Robonic could be required to close in on a fault.
Thus can be seen the need for Robonics to have, inter-
rupting, closing and withstand ratings.
The interrupting, closing and withstand ratings shown in
Table 1 are those for standard typea Robonics. For higher
values, consideration can be given to use of Robonics built
with Tri-Pac or Current Limiting breakers.
Table I Interrupting, Closing and Withstand Rating
- Robonic Type A
Robonic rms symmetrical amperes
Continuous
Rating Type 600 Vac 480 Vac 120,208,240 Vac
30 to 100 amps LRO 25,000 65,000 100,000
150 to 400 amps RO 35,000 65,000 100,000
600 lo 1000 amps RO 25,000 35,000 65,000
1200 to 3000 amps SPB 85,000 100,000 100,000