GE Industrial Solutions ZBTSCTH SERIES 100 - 4000 AMPS - Manual (Page 19)

ZBTSCTH Operation and Maintenance Manual (46R-7000) Zenith Controls, Inc. 17
4. SOLID STATE PHASE RELAY
(ARSM)
The pickup and dropout points may be adjusted
by using the following procedure. Use of a
variable voltage supply (Variac) is required. The
relay is illustrated in Figure 7 below.
SECTION IV - ADJUSTMENTS AND SETTINGS
(Continued)
a. Turn the pickup adjustment fully clockwise.
b. Turn the dropout adjustment fully counter-
clockwise.
c. Set Variac to the desired pickup voltage.
d. Rotate the pickup adjustment counterclock-
wise very slowly until the relay picks up. The
LED will illuminate.
e. Set Variac to the desired dropout voltage.
f. Rotate the dropout adjustment clockwise very
slowly until the relay drops out. The LED will
go out.
g. Verify the setting by raising the voltage until
the relay picks up and lowering the voltage
until the relay drops out.
Pickup Voltage: 75% to 115% of Nominal
Factory Set: 90% of Nominal
Dropout Voltage: 55% to 105% of Nominal
Factory Set: 80% of Nominal
5. PARALLELING WINDOW UNDER-
OVERVOLTAGE SENSING RELAY
The pickup and dropout points may be adjusted
by using the following procedure. Use of a
variable voltage supply (Variac) is required. The
relay is illustrated in Figure 8.
a. Turn both DIFF adjustments fully counter-
clockwise.
b. Undervoltage sensing - Use lowest phase to
phase relationship on Variac to set the relay.
Set Variac voltage to desired undervoltage
setting. Turn undervoltage SET adjustment
fully clockwise, then slowly counterclockwise
until the LED illuminates.
c. Overvoltage sensing - Use the highest phase
to phase voltage relationship on Variac to set
the relay. Set Variac voltage to desired
overvoltage. Turn overvoltage SET adjustment
fully clockwise, then counterclockwise until
LED illuminates.
Undervoltage: 75-100% of 120V
Factory Set: 95%
Overvoltage: 100-125% of 120V
Factory Set: 105%
6. ELECTRONIC TIME SWITCH
Z2000-2A
This time switch is used for the C/D option. Time
switch Z2000-1A is used for the C option.
a. Setting Time and Day:
Press and hold “ ” button during the Following
adjustments:
1) Press “d” to set day pointer to correct day:
1 = Monday...7 = Sunday
2) Press “h” to set the hour. The time of day is
expressed in 24-hour military time:
04:00 = 4 a.m.....20:00 = 8 p.m.
3) Press “m” to set minutes
4) Release “ ” button. Clock is running
Figure 7
Figure 8