6
Measure across ATS terminal lugs N1 to NEUTRAL,
N2 to NEUTRAL, and N3 to NEUTRAL.
3.
Three-phase only.
Locate the 3 phase power
monitor relay. Verify the following:
208 Vac system - LED Green and ON
The factory setting is 80% of nominal voltage
(208 Vac systems = 166 Vac dropout)
4. If the LED indicator is Red or not ON, then it will
be necessary to adjust the power monitor relay
setting. Rotate the adjustment potentiometer in a
counter-clockwise direction until the LED turns
ON. At this point the 3 phase power monitor relay
is the most sensitive to irregular power line con-
ditions.
NOTE:
If the power monitor does not operate properly,
check that all three voltages are present, and are
of the correct voltage level
DANGER
FAILURE TO TURN OFF THE UTILITY SUPPLY
BEFORE WORKING ON THE UTILITY CONNEC-
TIONS OF THE ATS WILL RESULT IN EXTREMELY
DANGEROUS AND POSSIBLY FATAL ELECTRICAL
SHOCK.
5. When certain that UTILITY supply voltage is cor-
rect and compatible with transfer switch ratings,
turn OFF the UTILITY supply to the transfer
switch.
3.3.2 GENERATOR VOLTAGE CHECKS
1.
On the generator panel, set the AUTO/OFF/
MANUAL switch to MANUAL position. The gen-
erator should crank and start.
2.
Let the generator stabilize and warm up at no-
load for at least five minutes.
3.
Set the generator's main circuit breaker (CB1) to
its ON or CLOSED position.
Section 3 — Operation
RTS “HS” Type Transfer Switch
Figure 3.1 — Actuating Transfer Switch
