GE ZTX manual Control Interface cont’d, Using the Keypad Controls

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.

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.

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).

■ 8 ZTX Operation and Maintenance Manual (72R-1000) GE Zenith Controls ■