Generac Power Systems 04635-0 owner manual Voltage Checks, Close to Normal Source Side

Section 3 — Operation

Generac GTS “W” Type Transfer Switch

•Window “A” OFF, Window “B” ON - LOAD terminals (T1, T2) are connected to EMERGENCY terminals (E1, E2).

Do not use excessive force when operating

!the transfer switch manually or the manual handle could be damaged.

◆3.2.1 CLOSE TO NORMAL SOURCE SIDE

Before proceeding, verify the position of the switch by observing window “A” in Figure 3.1. If window “A” reads “ON”, the contacts are closed in the NORMAL position, no further action is required. If it reads “OFF”, proceed with Step 1.

Step 1: With the handle attached to the actuating shaft, move handle in the direction of the arrow on the switch cover until it stops — DO NOT FORCE. Release handle slowly to allow the spring in the switch box to relax. “ON” now appears in Window “A” and “OFF” appears in Window “B”.

◆3.2.2 CLOSE TO EMERGENCY SOURCE SIDE

Before proceeding, verify the position of the switch by observing window “B” in Figure 3.1. If window “B” reads “ON”, the contacts are closed in the EMERGENCY (STANDBY) position. No further action is required. If it reads “OFF”, proceed with Step 1.

Step 1: With the handle attached to the actuating shaft, move the handle in the direction of the arrow on the switch cover until it stops - DO NOT FORCE. Release handle slowly to allow the spring in the switch box to relax. “OFF” now appears in Window “A” and “ON” appears in Window “B”.

Single-phase utility supply:

Measure across ATS terminal lugs N1 and N2; N1 to NEUTRAL and N2 to NEUTRAL.

3.When certain that UTILITY supply voltage is correct and compatible with transfer switch ratings, turn OFF the UTILITY supply to the transfer switch.

4.On the generator panel, set the AUTO-OFF- MANUAL switch to MANUAL position. The generator should crank and start.

5.Let the generator stabilize and warm up at no- load for at least five minutes.

6.Set the generator's main circuit breaker (CB1) to its ON or CLOSED position.

DANGER

PROCEED WITH CAUTION. GENERATOR OUTPUT VOLTAGE IS NOW BEING DELIVERED TO TRANSFER SWITCH TERMINALS. CONTACT WITH LIVE TERMINALS RESULTS IN EXTREMELY DANGEROUS AND POSSIBLY FATAL ELECTRICAL SHOCK.

7.With an accurate AC voltmeter and frequency meter, check the no-load, voltage and frequency. Single-phase generator supply:

Measure across ATS terminal lugs E1 to E2; E1 to NEUTRAL and E2 to NEUTRAL.

a.Frequency ......................................60-62 Hz

b.Terminals E1 to E2 ........................240-246 VAC

c.Terminals E1 to NEUTRAL ............120-123 VAC

d.Terminals E2 to NEUTRAL ............120-123 VAC

It will also be necessary to verify that the phase rotation of the utility matches the phase rotation of the generator. This can be done by using a phase rotation indicator.

◆3.2.3 RETURN TO NORMAL SOURCE SIDE

Manually actuate switch to return Window “A” to the “ON” position.

3.3VOLTAGE CHECKS

1.Turn ON the UTILITY power supply to the transfer switch with whatever means provided (such as the UTILITY maim line circuit breaker).

DANGER

PROCEED WITH CAUTION. THE TRANSFER SWITCH IS NOW ELECTRICALLY HOT. CONTACT WITH LIVE TERMINALS RESULTS IN EXTREMELY HAZARDOUS AND POSSIBLY FATAL ELECTRICAL SHOCK.

2.With an accurate AC voltmeter, check for correct voltage.

Failure to do so may result in damage to

!certain rotary equipment.

8.Set the generator’s main circuit breaker (CB1) to its OFF or OPEN position.

9.Set the AUTO-OFF-MANUAL switch to the OFF position to shut down the generator.

NOTE:

Do NOT proceed until generator AC output voltage and frequency are correct and within stated limits. If the no-load voltage is correct but no-load frequency is incorrect, the engine governed speed probably requires adjustment. If no-load frequency is correct but voltage is not, the voltage regulator may require adjustment.

6 Generac® Power Systems, Inc.