Test 32 - Check N1 And N2 Wiring; Test 33 - Check N1 And N2 Voltage - Generac Power Systems 7 kW NG Repair Manual

TRANSFER SWITCH
11
E1
Figure 80. Main Line Circuit Breaker
3. Connect one meter test lead to the Wire 11 terminal on
the breaker and the other test lead to the E1 terminal. See
Figure 80.
4. Set the breaker to its "Closed" position; the VOM should
indicate CONTINUITY.
5. Set the breaker to its "Open" position; the VOM should
indicate INFINITY.
6. Repeat Step 4 and 5 with the VOM meter leads connected
across the Wire 44 terminal and the E2 terminal.
Results
1. If the circuit breaker tests good, refer back to the flow
chart.
2. If the breaker failed Steps 4 or 5, replace the breaker.
TEST 32 – CHECK N1 AND N2 WIRING
Discussion
A shorted Wire N1 or N2 to ground can cause fuse F1 or F2
to blow.
Procedure
1. On the generator panel, set the AUTO-OFF-MANUAL
switch to OFF.
2. Turn off the utility power supply to the transfer switch,
using whatever means provided.
3. Remove fuses F1, F2, and F3 from the fuse holder.
4. Remove the generator control panel cover. Disconnect the
J5 connector that supplies the controller located in the
control panel.
PART 3
44
LINE SIDE
LOAD SIDE
E2
5. Set VOM to measure resistance.
6. Connect the positive meter test lead to Wire N1 at the
terminal block in the control panel.
a. Connect the negative meter lead to the ground lug.
INFINITY should be measured.
b. Connect the negative meter lead to Wire 23 at the
terminal strip. INFINITY should be measured.
c. Connect the negative meter lead to Wire 194 at the
terminal strip. INFINITY should be measured.
d. Connect the negative meter lead to Wire 0 at the terminal
strip. INFINITY should be measured.
e. Connect the negative meter lead to Wire N2 at the terminal
block. INFINITY should be measured.
f. Connect the negative meter lead to the neutral
connection. INFINITY should be measured.
7. Connect the positive meter test lead to Wire N2 at the
terminal block in the control panel.
a. Connect the negative meter lead to the ground lug.
INFINITY should be measured.
b. Connect the negative meter lead to Wire 23 at the
terminal strip. INFINITY should be measured.
c. Connect the negative meter lead to Wire 194 at the
terminal strip. INFINITY should be measured.
d. Connect the negative meter lead to Wire 0 at the
terminal strip. INFINITY should be measured.
e. Connect the negative meter lead to the neutral
connection. INFINITY should be measured.
Results
If a short is indicated in Step 6 or Step 7, repair wiring and
re-test.
TEST 33 – CHECK N1 AND N2 VOLTAGE
Discussion
Loss of utility source voltage to the generator will initiate a
startup and transfer by the generator. Testing at the control
panel terminal block will divide the system in two, thereby
reducing troubleshooting time.
Procedure
1. Set the AUTO-OFF-MANUAL switch to OFF.
2. Set a VOM to measure AC voltage.
3. See Figure 81. Connect one test lead to Wire N1 at the
terminal block in the generator control panel. Connect the
other test lead to Wire N2. Utility line-to-line voltage should
be measured.
Results
Refer to Flow Chart
Section 3.4
Diagnostic Tests
Page 85