Operation and Features (cont’d)
Zenith Optional Accessories
Many control accessories are available to meet specific requirements. Some of the more
commonly specified accessories are:
A Auxiliary Contacts:
A6 Deenergizes external motor control circuit5 seconds (adjustable) prior to
transfer in either direction.
C Plant Exerciser (no load): Automatically starts the generator to run unloaded at
selected intervals
C/D Plant Exerciser (Load/no load): Allows the generator to start and run unloaded
or to simulate a power failure, start generator and run under load. Specify weekly,
bi-weekly or calendar schedule
L Indicating LED Pilot Lights:
L3
Indicates normal source available
L4 Indicates emergency source available
P2 Time Delay - Engine Start: Adjustable 0.5 to 300 seconds
Q2 Peak Shave/Remote Load Test: Input for peakshave or remote load test; includes
automatic return to normal if emergency source fails and normal is present; 120
V
AC or 24 VDC
R4 In-Phase Monitor: Prevents transfer until two sources are in relative synchronism
R43
In-Phase Monitor: Prevents transfer until two sources are in relative synchronism
S1 Four-position selector switch (Stop - Hand Crank - Test - Automatic)
S2 Disconnect switch in series with accessory E to disconnect engine-starting circuit
S3 Source selector switch circuit; to select either source as primary
T3/W3Time Delays - Presignal for Auxiliary Control: Prior to transfer between two live
sources in either direction, provides an adjustable (factory set at 20 second) presignal
contact closure
W100 Time Delay on Transfer to Emergency: To delay transfer to emergency after verifying
emergency source available; standard setting 1 sec., adjustable 0-15 sec.
YEN Pushbutton Bypass of T&W Timers
10
ZTSH Operation and Maintenance Manual (43R-1000)
Zenith Controls, Inc.
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General