Test 25 - Check Wire 23 - Generac Power Systems 7 kW NG Repair Manual

TRANSFER SWITCH
5. Measure across points A and B, the VOM should indicate
240 VAC.
a. If 240 VAC was NOT measured, go back to Test 20.
b. If 240 VAC was measured, proceed to Step 6.
6. Measure across points C (Wire E2 previously removed)
and B, the VOM should indicate 240 VAC.
a. If 240 VAC was NOT measured, repair or replace Wire E2.
b. If 240 VAC was measured, proceed to Step 7.
7. Measure across points A and D, the VOM should indicate
240 VAC.
a. If 240 VAC was NOT measured, repair or replace Wire E1.
b. If 240 VAC was measured, proceed to Step 8.
8. Measure across points A and E, the VOM, the VOM should
indicate 240 VAC.
a. If 240 VAC was NOT measured, replace transfer relay.
b. If 240 VAC was measured, proceed to Step 9
9. Measure across points A and F, the VOM should indicate
240 VAC.
a. If 240 VAC was NOT measured, repair or replace Wire
205.
b. If 240 VAC was measured, proceed to Step 10.
10. Measure across points A and G, the VOM should indicate
240 VAC.
a. If 240 VAC was NOT measured, verify the limit switch
(SW3) is wired correctly, proceed to Test 27 – Test
Limit Switches.
b. If 240 VAC was measured, proceed to Step 11.
11. Measure across points A and H, the VOM should indicate
240 VAC.
a. If 240 VAC was NOT measured, repair or replace Wire B.
b. If 240 VAC was measured, replace the C2 coil.
TEST 25 – CHECK WIRE 23
Discussion
The controller located in the generator is responsible for
grounding Wire 23 in order to initiate a transfer. When Wire 23
closes to ground the transfer relay (TR1) energizes. To initiate
a transfer back to Utility the TR1 relay must de-energize. If the
TR1 relay is staying energized, a grounded Wire 23 could be
the cause.
Procedure/Results
1. Set the Volt-Ohm-Milliammeter (VOM) to measure DC
voltage.
2. Set the AUTO-OFF-MANUAL switch to the OFF position.
3. Connect the positive meter test lead to Wire 194 and
connect the negative meter test lead to Wire 23 located in
the transfer switch.
PART 3
a. If 0 VDC was measured, proceed to Step 4.
b. If 12 VDC was measured, proceed to Step 13.
4. Set the AUTO-OFF-MANUAL switch to the AUTO position.
5. Connect the positive meter test lead to Wire 194 and
connect the negative meter test lead to Wire 23 located in
the transfer switch.
a. If 12 VDC was measured, proceed to Step 6.
b. If 0 VDC was measured, the Wire 23 circuit is good,
refer back to flow chart
6. Press "ESC" three times.
7. Press the right arrow key until "Debug" is flashing.
8. Press "Enter".
9. Press the right arrow key until "Outputs" is flashing.
10. Press "Enter".
OUTPUTS 1 - 8:
1 0 1 1 0 0 0 1
Figure 77. The Home Page, Debug and Output Screens
11. Digital Output 8 is the Wire 23 output from the controller.
Refer to Figure 77.
12. If Output 8 shows a "1" then the control board is
grounding Wire 23. Replace the controller.
13. Locate the terminal strip in the generator control panel.
Disconnect Wire 23 coming in from the transfer switch
(customer side, see Figure 79).
14. Connect the positive meter test lead to Wire 194 at the
terminal strip in the generator and connect the negative
meter test lead to Wire 23 just removed from the terminal
strip in Step 13 (Customer Side).
a. If 0 VDC was measured, proceed to Step 15.
b. If 12 VDC was measured, a short to ground exists on
Wire 23 between the generator and transfer switch.
Repair or replace Wire 23 as needed between the
generator control panel and transfer switch relay (TR1).
Section 3.4
Diagnostic Tests
DEBUG
OUTPUTS
OUTPUT 8
Page 81