5
3.1
FUNCTIONAL 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 abso-
lutely certain the installation is proper and correct,
complete a functional test of the system.
Perform functional tests in the exact order pre-
sented 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 infor-
mation and instructions of labels and decals affixed
to the switch. Note any options or accessories that
might be installed and review their operation.
3.2 MANUAL OPERATION
DANGER
Do NOT manually transfer under load.
Disconnect transfer switch from all power sourc-
es 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 AUTO/OFF/MANUAL switch
to OFF.
2. Turn OFF both UTILITY and EMERGENCY power
supplies to the transfer switch, with whatever
means provided (such as the main line circuit
breakers).
3. Note position of transfer mechanism main con-
tacts by observing display windows in “A” and “B”
in Figure 3.1 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
terminals (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. 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”.
3.2.3 RETURN TO NORMAL SOURCE SIDE
Manually actuate switch to return Window “A” to the
“ON” position.
3.3 VOLTAGE
CHECKS
3.3.1 UTILITY VOLTAGE 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 ELECTRICAL
SHOCK.
2.
With an accurate AC voltmeter, check for correct
voltage.
Single-phase utility supply:
Measure across ATS terminal lugs N1 and N2; N1
to NEUTRAL and N2 to NEUTRAL.
Three-phase utility supply:
Measure across ATS terminal lugs N1 to N2, N2
to N3, and N1 to N3.
Section 3 — Operation
RTS “HS” Type Transfer Switch
