GE Industrial Solutions ZBTSD Series - Manual (Page 34)

32 71R -4000B ■ ZBTS / ZBTSD Operation and Maintenance Manual
CAUTION
Adjustments and Settings
Solid State Timers
Solid state timers are adjustable from 0.1 second to 100
hours. The red timing indicator in the upper left corner
flashes as the timer progresses through the timing cycle.
When the timing cycle is completed, the indicator remains
illuminated. A flathead screwdriver is required to change
the setting, as shown in Figure 22.
The time unit is selected by turning the rotary switch at the
lower right of the timer. Four selections are available: “Seconds”,
“Minutes”, “Hours”, “10 Hours”. The time unit selected
is displayed in the window below the time setting dial.
The time range is selected by turning the rotary switch
at the lower left of the timer. Four ranges are available:
“0-0.5”, “0-1.0”, “0-5.0”, “0-10.0”. The dial digits appear in
the windows around the time setting knob.
The factory setting of the solid state timers used in the
Zenith standard package are shown in Table 4.
Timer
T
U
W
30 minutes
5 minutes
1 second
Table 4
Figure 23
Factory Setting
Do NOT change the setting while the timer is energized. Timer malfunction or damage may occur.
Voltage/Frequency Sensor
(VFSM)
The “restore” or pickup point may be adjusted by
rotating the adjustment screw as shown in Figure 23.
Counter-clockwise rotation increases the pickup voltage.
“Restore”/Pickup Voltage (at 100% Frequency)
Adjustable: 80% to 95%
Factory Set: 90%
“Restore”/Pickup Frequency
Adjustable: 80% to 100%
Factory Set: 95%
Solid State Phase Relay ( ARSM )
The “restore” or pickup and “fail” or 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 24.
1. Turn the “restore” or pickup adjustment
fully clockwise.
2. Turn the “fail” or dropout adjustment fully
counter-clockwise.
3. Set Variac to the desired “restore” or pickup voltage.
4. Rotate the “restore” or pickup adjustment counter-
clockwise very slowly until the relay picks up. The
LED will illuminate.
5. Set Variac to the desired “fail” or dropout voltage.
6. Rotate the “fail” or dropout adjustment clockwise very
slowly until the relay drops out. The LED will go out.
7. Verify the setting by raising the voltage until the
relay restores or picks up and lowering the voltage
until the relay fails or drops out.
“Restore”/Pickup Voltage:
75% to 115% of Nominal
Factory Set:
90% of Nominal
“Fail”/Dropout Voltage:
55% to 105% of Nominal
Factory Set:
80% of Nominal
Figure 24
Figure 22