250 Dc Rating; Sending End; Undercurrent Detection {Spa 11A And 11 B); Overcurrent Detection {Spa 11A And 11B) - GE SPA11A Instructions Manual

250 DC Rating

The 250 DC rating is accomplished with an external pre-regulator, 0138B7511G2 and
G3. The pre-regulator is a DC-to-DC Convertor that reduces the 250 VDC station voltage to
the 125 VDC rating of the SPA relay. Therefore, when this pre-regulator is used, the SPA
relay DC pins on the 125 volt position.
The pre-regulator in designed to be mounted on the panel next to the relay.
The electrical connections for the pre-regulator are made as follows:
INPUT
PRE-REGULATOR
+ 250 VDC
DC
Undercurrent Detection (SPA 11A and 11 B)
Refer to test plug connection diagram, Figure 15.
Apply DC power to studs 4 (positive) {+) and 5 (negative) {-). Be sure that the power
supply selector pins on printed-circuit board # 1 {left hand board) are set properly for the
DC voltage being used. It is necessary to remove the nameplate and card guide to
reposition the selector pins.
Connect a 39,000 ohm external resistor {rated 1/4 watt) between studs 7 and 8. The UC
telephone relay should drop out and the UC indicator LED should light. Replace the resistor
with a 20,000 ohm resistor. The UC telephone relay should be picked up and the UC
indicator LED should be off.

Overcurrent Detection {SPA 11A and 11B)

Refer to test plug connection diagram, Figure 15.
Repeat the undercurrent test using the following resistors:
With 6,200 ohms {1/4 watt), the OC telephone relay should pick up and the OC
LED should light. With 13,000 ohms, the OC telephone relay should be dropped
out and the OC indicator LED should be off.
Ground Detection {SPA 11A and 11 B)
Refer to test plug connection diagram, Figure 16.
Apply DC power to studs 4 (positive) (+) and 5 (negative) {-). Connect a 10,000 ohm
external resistor {rated 1/4 watt) between studs 7 and 16. The GND telephone relay should
pick up and the GND indicator LED should light.

Transfer Trip {SPA 11 B)

Refer to test plug connection diagram, Figure 17.
GEK-65512
OUTPUT
TERMINAL
A + 125 VDC
C DC
PRE-REGULATOR
TERMINAL
B
c
14
TO SPA RELAY
TERMINAL
4
5