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4.5 Verify synchronization and
calibration.
1. Start generator 1 by pressing RUN on the RDC2
controller.
2. When the generator reaches rated voltage and
frequency, verify that the corresponding contactor
in the APM closes.
3. Verify that the Generator Rotation Actual
parameter (under Generator Metering in SiteTech)
reads a number between - 300 and 300 (- 30_ and
30_ phase angle across the closed contactor). If
the Generator Phase Rotation is outside this
range, the RDC2 controller on Generator 1 is not
sensing the bus direction accurately.
4. Calibrate the vol tage metering on Generator 1.
5. Calibrate the bus metering (listed as Generator
Voltage L2-L3). Always calibrate the bus voltage
with the generator running and the paralleling
contactor closed.
a. The bus metering should match the calibrated
generator metering.
Note: It is normal for the bus voltage to vary more
than the generator voltage. T ry to match the
average bus voltage reading with the
generator voltage.
b. Increase the Genset Calibration Factor Voltage
L2-L3 to increase the measured bus voltage.
c. Decrease the Genset Calibration Factor
Voltage L2-L3 to decrease the measured bus
voltage.
6. Stop generator 1 and repeat the steps above for
generator 2.
7. After completing synchronization checking, stop
both generators and place them both in Auto (note:
the generators will start if there is not utility present
on the ATS).
4.6 Verify current metering.
1. Check that both generator sets are in AUTO mode.
2. Open the utility source breaker to the ATS to
simulate loss of utility power. A loaded exercise
canalsobeused.*
* A loaded exercise can be set at the generator controller.
3. Verify that the generators start, synchronize and
close both contactors. This will enable the
controllers to verify the metering. The engines may
appear slightly unstable during the verification
process.
4. Once the verification process is complete, the ATS
will transfer. At this point, the metering has been
verified.
Note: The metering verification only needs to be
performed once. Subsequent losses of
utility will result i n more timely transferring of
the ATS.
5. Close the utility source circuit breaker or wait for the
loaded exercise to end. Verify that the ATS
transfers to utility and both generator sets shut
down.
6. Verify that both generator sets are in the AUTO
mode after commissioning is complete.
Troubleshooting Current Metering
If a generator shuts down and the RDC2 controller
displays “No Current Shutdown,” verify that the AC
output wires are crossing through the CT in opposite
directions as shown in Figure 5 and that the CT is
connected to the generator controller at P3. Correct and
retry the current metering test from step 1 in Section 4.6.
The message “ErraticSig Shutdown Current Metering”
indicates that the current reading is very unstable.
Otherwise, the controller has successfully deter mined
the direction of the CT connection on the generator
when the ATS transfers.
4.7 Final adjustments.
At this point, the paralleling system is capable of
providing power to the loads connected to ATS. Further
adjustment of gains and windows to optimize
performance can be completed at this time, if desired.
See Section 5.3.2, Order Selection Method, for
instructions to set the generator set order of operation
manually or to select the runtime hours method, which
balances the generator set operation times according to
the number of hours on each generator set. The runtime
hours method is the default selection.
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