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GE Zenith Controls
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ZTG/ZTGD Operation and Maintenance Manual (70
R
-1000D)
6A
Test Switch, Maintained / Momentary
6AP
Test Switch, Maintained / Momentary, utilizing Keypad
A1
Auxiliary Contact, operates on Source 1 line failure.
A1E
Auxiliary Contact, operates on Source 2 line failure.
A3
Auxiliary Contacts: Closed when the transfer switch
is in Source 2 position.
A4
Auxiliary Contacts: Closed when the transfer switch
is in Source 1 position.
A62
Sequential Universal Motor Load Disconnect Circuit.
Normally closed Auxiliary contacts for Motor Loads.
Open 0-60 seconds prior to transfer, after transfer, or
both in either direction then re-close in timed sequence
after transfer. Factory default: 20 seconds
CTAP
Alarm Panel on transfer to Source 2 with Silence button.
DS
Disconnect Switch, Auto/Inhibit.
Inhibits transfer in either direction when in inhibit.
Allows automatic operation when in Auto.
(40-600 Amp units)
HT
Heater and Thermostat.
Manual
Manual Transfer Switch transfers in either direction
by depressing designated pushbuttons.
M80
Digital Power Meter with Display: Amps, Volts, and
Frequency.
M82
Digital Meter w/Display of Amps, Watts, Volts,
Frequency, KVA, KVAR, PF, etc.
M83A
Digital Meter w/Diplay of Amps, Watts, Volts,
Frequency, KVA, KVAR, PF, etc. Plus THD capability
w/Modbus.
T3/W3
Elevator Pre-Signal Auxiliary Contacts: Open 0-60
seconds prior to transfer to either direction,
re-closes after transfer. Factory default: 20 seconds
UMD
Universal Motor Load Disconnect Circuit: Auxiliary
Contact opens 0-5 minutes prior to transfer in either
direction, re-closes after transfer. Can be configured
by end user for Pre-transfer, Post-transfer, or both.
Factory default: 15 seconds
VI
Voltage Imbalance (Three Phase)
For a three phase source, this feature monitors phase
voltage ratios based on a selected range within a
selected time window. Should any phase fall below the
selected lower window limit or exceed the selected
higher window limit within the selected time frame,
the controller initiates transfer to the other source.
Range: 5% to 20% of Nominal voltage,
10 to 30 seconds window, user adjustable.
Resolution: 1% Increments
Minimum Differential: 2% between “Fail”
and “Restore” settings.
Factory default: 10% “Fail”, 8% “Restore, 30 Seconds.
See CFG Menu page 17 to configure ON or OFF.
See SET Menu page 18 to set Percentage and time
windows
ZNET
Network Communications Interface Card
Optional Accessories
