Generac Not explicitly stated — Results

For the Generac Not explicitly stated.

Applies to: Generac Not Explicitly Stated

Procedure

1. 4. If battery voltage was measured in , repair or replace Wire 29 (white) between DB1 and R4.
2. 4. If battery voltage was not measured in , but
3. 10. was measured in , replace DB1.
4. 10. If battery voltage was not measured in , Test 3 – Test DB2 Fly Back Diode General Theory A kick back voltage is created when any magnetic field collapses. The fly back diode is connected to Wires 1 and 4 and serves to shunt this kick back voltage to ground when the rotor's magnetic field collapses. The diode is connected to allow current to be blocked during normal operation and shunt to ground when the polarity reverses during the collapse of the magnetic field. If the diode is connected improperly and allows current to flow during normal operation, field boost voltage will be shunted to ground and the output at the breaker will remain minimal. Disconnect yellow Wire 4 (B on DB2) and black Wire 1 (A on DB2) from the diode. Set DMM to the diode test position. Connect the red meter lead to test point A and the black meter test lead to test point B. Measure and record the voltage indicated. Connect the black meter lead to test point A and the red meter test lead to test point B. Measure and record the voltage indicated. Results
5. 3. If the DMM indicated 0.4–0.5 VDC in and 0
6. 4. VDC (OPEN) in , refer to the flow chart. Replace the DB1 diode if any other results are measured. Test 4 – Test AC Excitation (DPE) Circuit General Theory The AC excitation circuit (DPE) is the power supply to the voltage regulator. The voltage regulator also rectifies the AC voltage to a varying controlled value of DC field excitation. This testing procedure is going to verify the integrity of the DPE winding. (000236) DANGER Automatic start-up. Disconnect normal power source and render unit inoperable before working on unit. Failure to do so will result in death or serious injury. A B 003194 A B USE NOTCH FOR PROPER ORIENTATION Section 2.2 AC Diagnostic Tests Diagnostic Repair Manual 35 Procedure Set DMM to measure resistance. Locate the TB1 terminal block (WAGO Block) in the customer connection box. Locate and disconnect Wires 2 and 6 from the TB1 terminal strip that connect to the control panel. Insert test leads into the WAGO block test ports that correspond to Wires 2 and 6. Measure and record the value indicated by the DMM. the WAGO block. a. If the DMM indicated the resistance of the DPE winding indicated in Section 1.1 Rotor And
7. 4. proceed to . b. If the DMM indicated INFINITY, or lower or higher than expected resistance, verify the integrity of the connections at the TB1 terminal block and the integrity of the wire running to the stator. If the DMM continues to indicate a value Locate Wires 2 and 6 on the WAGO block. Set meter to measure resistance. Using the test ports on the WAGO block, measure Wire 2 to ground and Wire 6 to ground. Record the results. a. If low ohms or low K ohms are measured to ground, the winding is shorted to ground. Replace the stator. b. If INFINITY is measured to ground, go to the next step. Reconnect the control panel Wires 2 and 6 to the TB1 terminal block (WAGO block) and disconnect Wires 2 and 6 on the WAGO block that come from the stator. Connect one meter test lead to Wire 2 at PZ-1 Pin 1 at the back of the control panel. Connect the other meter test lead to TB1 Wire 2. Measure and record the resistance indicated. a. If the DMM indicated CONTINUITY, proceed to
8. 7. . b. If the DMM indicated INFINITY or a high resistance, repair or replace the wire between Wire 2 on the back of the control panel and the TB1 Wire 2 connections. Connect one meter test lead to Wire 6 at PZ-1 Pin 3 at the harness connections to the control panel. Connect the other meter test lead to TB1 Wire 6. Measure and record the resistance indicated. a. flow chart. 005345 005346 005347 005348 Section 2.2 AC Diagnostic Tests 36 Diagnostic Repair Manual b. If the DMM indicated INFINITY or a high resistance, repair or replace the wire between Wire 6 at the harness connections to the control panel and the TB1 Wire 6 connections. Reconnect control panel Wires 2 and 6 to the TB1 terminal block (WAGO block). Test 5 – Test AC Sensing Circuit General Theory The AC sensing circuit serves to provide a reference of stator output voltage at the main circuit breaker. The regulator reacts to the change in AC sensing voltage by increasing DC field excitation if voltage goes low, and decreasing DC field excitation if output is too high. If the regulator does not receive this voltage, output at the breaker will be minimal. Procedure Set a digital multimeter (DMM) to measure resistance. Connect one meter test lead to Wires S1/S2 (1- Phase) or Wires S1/S2/S3 (3-Phase) at the MLCB and the other meter test lead to the appropriate AC sensing input to the control board. Measure and record the resistance indicated. a. If the DMM indicated CONTINUITY, proceed to
9. 3. . b. If the DMM in dicated INFINITY on any sensing lead, repair or replace the wire between MLCB and the control board. Connect one meter test lead to Wire 00 at the neutral bar and the other meter test lead to neutral sensing input PZ8 Pin 4. Measure and record the resistance indicated. a. If the DMM indicated CONTINUITY, contact Technical Support. b. If the DMM indicated INFINITY on PZ8 Pin 4, repair or replace the wire between neutral bar and the control board. 005349 015305

Source: manual:Generac Diagnostic Repair Manual Power Zone A0003109811.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.