Electrical Operation - Generac Power Systems TTS series Owner's Manual

Operation
Perform voltage checks as follows:
1. Inside the transfer switch enclosure, set the Maintenance
Disconnect switch to MANUAL.
2. If generator is so equipped, set the AUTO/OFF/MANUAL
switch to OFF.
3. On the ATS mechanism, check that the word "ON" is visible
in Window "A", the word "OFF" in Window "B". See MANUAL
OPERATION for location of "A" and "B" windows.
IMPORTANT: DO NOT PROCEED UNTIL STEPS 1, 2, 3, AND 4
HAVE BEEN COMPLETED.
Before proceeding to voltage checks, manu-

ally connect the load to NORMAL power sup-
ply. Window "A" must indicate ON, Window
"B" must indicate OFF before proceeding.
4. Locate the 4-pin connector on the battery charger. Plug the
4-pin harness connector into the battery charger.
If BOTH UTILITY and GENERATOR sources are unavailable for
more than 24 hours, disconnect the battery by unplugging the
4-pin connector on the battery charger.
5. Turn ON the NORMAL (UTILITY) power supply to the transfer
switch, with whatever means provided (such as the main line
circuit breaker).
The transfer switch is now electrically hot.

Proceed with caution.
6. With UTILITY voltage available to the transfer switch, referenc-
ing the HMI - System Status screen, verify that the UTILITY
OK indicator is GREEN. If this indicator is OFF, turn off the
utility power supply to the transfer switch by whatever means
provided (such as the main line circuit breaker), then proceed
back to Step 1 of "VOLTAGE CHECKS".
7. With an accurate AC voltmeter, check the phase-to-phase
(line-to-line) and phase-to-neutral (line-to-neutral) voltages
present at transfer mechanism terminals N1, N2, and N3
(if so equipped), and neutral. SUPPLIED VOLTAGES MUST
BE FULLY COMPATIBLE WITH TRANSFER SWITCH RATED
VOLTAGE.
8. Place generator selection switch in the On-site Generator
position. This will connect the on-site generator to generator
input terminals on the ATS.
Ensure that the phase rotation of NORMAL

(UTILITY) power lines and transfer switch
load power lines are compatible.
9. Refer to the standby generator instruction manual. Make sure
the generator engine has been properly serviced and prepared
for use, as outlined in that manual. Then start the generator
engine manually. Let the engine stabilize and warm up for a
few minutes.
8
NOTE:
10. Turn ON the STANDBY (GENERATOR) power supply to the
transfer switch by whatever means provided (such as the
main line circuit breaker).
11. With the generator running, check that the GENERATOR
SOURCE AVAILABLE indicator on the HMI is ON.
12. With an accurate AC voltmeter, check phase-to phase (line-to-
line) and phase-to neutral (line-to neutral) voltages present at
transfer mechanism terminals E1, E2 and E3 (if so equipped).
Also check AC frequency at those terminals. If frequency
is incorrect, the engine governor may require adjustment.
Generator AC output voltage and frequency must be compat-
ible with transfer switch rated voltage and frequency.
Ensure that the phase rotation of STANDBY

(GENERATOR) power lines and transfer
switch NORMAL (UTILITY) and load power
lines are compatible.
13. If supplied voltage or frequency is incorrect, refer to standby
generator Owner's Manual. If AC frequency is incorrect,
adjust engine governed speed. If voltage is incorrect, adjust
generator's voltage regulator or correct the problem.
14. When supplied voltage and frequency is correct, shut down
the engine manually.
Supplied voltages from both NORMAL

(UTILITY) and STANDBY (GENERATOR)
power sources must be compatible with
transfer switch rated voltage before proceed-
ing.
15. Connect the transfer switch load to the transfer switch when
"Voltage Checks" section has been completed. Connect the
load to the transfer switch by whatever means provided [such
as branch circuit, circuit breaker(s)], then proceed with the
"Electrical Operation" section.

3.4 ELECTRICAL OPERATION

Test transfer system electrical operation as follows:
1. On the door mounted HMI home screen, check that the
UTILITY is connected to the customer load, and the UTILITY
SOURCE IS AVAILABLE.
2. Refer to the appropriate owner's manual. Be sure the standby
generator is prepared for automatic operation.
3. In the switch enclosure, set the Maintenance Disconnect
switch to AUTOMATIC.
4. Select the TEST screen on the HMI and select the TEST func-
tion. Generator startup and transfer to the STANDBY power
source should occur with normal time delays. Refer to the
"Sequence of Operation" section.