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Using the Keypad Controls
TEST KEY
The TEST KEY initiates a transfer sequence to S2 and
holds the ATS in that mode until either the CANCEL
key is pressed or, a situation arises to cause the ATS to
go back to S1(ie, S2 actually fails).
In order to perform a TEST, the ATS must be on S1 and
S1 must qualify as a "good source" by being above the
FAIL thresholds for both Voltage and Frequency (see
Table 2).
Once the TEST KEY is pressed for at least 1 Sec, the
ATS will begin the Timer Sequence (see figure 5),
attempt to start S2 generator source, and if S2
qualifies as a "good source", transfer the load to S2.
(There is no P-Time in a test)
The TEST key is typically used to perform a system
operational or maintenance test or, to purposely cause
and hold the Load off of S1. If during the TEST, S2
fails and S1 is available, the TEST will be cancelled and
the Load will be immediately retransferred to S1.
EXER SET
Whenever it is required to have a regular test
performed automatically on a repeating basis, the
Automatic Exerciser function can be setup using
this key.
Depending on the jumper settings shown in Figure 8,
the ATS can be programmed to perform a repeating 7,
14, 21 or 28 day exercise at a particular time of day.
To initiate an Automatic Exercise, the EXER SET key
is pressed and held for at least 1 Sec. at the desired
exercise time. The ATS will begin the Timer Sequence,
attempt to start S2 generator source and if S2 qualifies
as a good source, transfer the Load to S2 for the dura-
tion of the Generator Run-Time. After the Generator
Run-time has expired, the timing sequence will restart
and the Load will be transferred back to S1, after T-
time, ending by running the U-time and finally ending
the call for S2.
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8 GE Zenith Controls
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ZTX Operation and Maintenance Manual (72R-1000)
Control Interface
(cont’d)
DANGER
HAZARDOUS VOLTAGE
(Can Cause Severe Injury or Death)
Turn OFF all power before installation, adjustment, or removal of transfer switch or any of its components.
TIMER BYPASS
This key is used to bypass (truncate), any of the running
timers shown in Table 3. Whenever the Timing/
Inphase LED is blinking, pressing the TIMER BYPASS
will end that particular delay and cause the ATS con-
troller to immediately jump to the next sequence step.
Note: The BYPASS key cannot be used to truncate an
In-phase transfer sequence, or the P-Timer.
CANCEL
The CANCEL key performs 3 different cancel actions
depending on the ATS current state of operation:
1. If the ATS is currently performing a TEST,
the CANCEL key will cancel the test.
2. If an Automatic Exerciser has been set, press-
ing and holding the CANCEL key for 10 Sec.
will cancel (and remove), the set exercise
3. If after in-phase monitor has passed 1 minute,
waiting for sources to synchronize, will cause
transfer immediatly (which may result in an
out-of-phase transfer).