Section 3 — Operation
Generac GTS “W” Type Transfer Switch
3.1FUNCTIONAL TESTS AND
ADJUSTMENTS
Following transfer switch installation and intercon- nection, inspect the entire installation carefully. A competent, qualified electrician should inspect it. The installation should comply strictly with all appli- cable codes, standards, and regulations. When absolutely certain the installation is proper and cor- rect, complete a functional test of the system.
Perform functional tests in the exact order
!presented in this manual, or damage to the switch could be done.
IMPORTANT: Before proceeding with functional tests, read and make sure you understand all instructions and information in this section. Also read the information and instructions of labels and decals affixed to the switch. Note any options or accessories that might be installed and review their operation.
3.2MANUAL OPERATION
DANGER
Do NOT manually transfer under load.
!Disconnect transfer switch from all power sources by approved means, such as a main circuit breaker(s).
A manual HANDLE is shipped with the transfer switch. Manual operation must be checked BEFORE the transfer switch is operated electrically. To check manual operation, proceed as follows:
1.Turn the generator’s
2.Turn OFF both UTILITY and EMERGENCY power supplies to the transfer switch, with what- ever means provided (such as the main line cir- cuit breakers).
3.Note position of transfer mechanism main con- tacts by observing display windows in “A” and “B” in Figure 3.1 on page 6 as follows:
•Window “A” ON, Window “B” OFF - LOAD termi- nals (T1, T2, T3) are connected to utility termi- nals (N1, N2, N3).
•Window “A” OFF, Window “B” ON - LOAD termi- nals (T1, T2, T3) are connected to emergency ter- minals (E1, E2, E3).
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 on page 6. If win- dow “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 on page 6. If win- dow “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”.
◆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 trans- fer 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 ELECTRI- CAL SHOCK.
2.With an accurate AC voltmeter, check for correct voltage.
Measure across ATS terminal lugs N1 and N2; N1 to NEUTRAL and N2 to NEUTRAL.
Measure across ATS terminal lugs N1 to N2, N2 to N3, and N1 to N3.
Measure across ATS terminal lugs N1 to NEU- TRAL, N2 to NEUTRAL, and N3 to NEUTRAL.
Generac® Power Systems, Inc. 5
