Test 15 - Check Load Voltage & Frequency; Test 16 - Check Load Watts And Amperage; Test 17 - Check Battery Charge Output; Test 18 - Check 10 Amp Battery Charge Output - Generac Power Systems GP Series Diagnostic And Repair Manual

Test 15 – Check Load Voltage and
Frequency
Procedure
Perform this test in the same manner as Test 1, but apply
a load to the generator equal to its rated capacity. With
load applied check voltage and frequency.
Frequency should not drop below about 59 Hertz with the
load applied.
Voltage should not drop below about 235 VAC with load
applied.
Results
If voltage and/or frequency drop excessively when
1.
the load is applied, go to Test 16.
If load voltage and frequency are within limits, end
2.
tests.
Test 16 – Check Load Watts and
Amperage
Procedure
Add up the wattages or amperages of all loads powered
by the generator at one time. If desired, a clamp-on
ammeter may be used to measure current flow.
Results
If the unit is overloaded, reduce the load.
1.
If load is within limits, but frequency and voltage
2.
still drop excessively, refer back to flow chart.
Test 17 – Check Battery Charge Output
Procedure
Disconnect wire 15 (center terminal) from battery
1.
charge rectifier 2 (BCR2), which is located under
BCR1. They are stacked.
See Control Panel Component Identification
and BCR2 location.
15
15
66A
BCR2
Figure 4-24. Testing BCR2
Diagnostic Repair Manual
for BCR1
2.0 A
77A
004613
Set DMM to measure DC Amps.
2.
a. Connect the positive (+) test lead to the center
terminal of the battery charge rectifier.
b. Connect the negative (-) test lead to wire 15
disconnected in step 1.
Start the generator.
3.
a. The amp reading on the meter should be
approximately 0.6 Amps.
b. Apply full load to the generator.
c. The amp reading should increase to
approximately 2 Amps.
Results
If amperage was measured between 0.6 to 2 Amps
1.
in step 2 and step 3, the charging system is working.
If no amperage was measured, check the meter
2.
fuses and verify the functioning of the meter. If
meter is good and no current is measured refer to
flow chart.
Test 18 – Check 10 Amp Battery
Charge Output
Procedure
NOTE: The battery charge cable must be connected to
the 12 VDC panel receptacle and be charging a separate
battery to perform this test.
Disconnect wire 13A (center terminal) from battery
1.
charge rectifier 1 (BCR1), which is located on top
of BCR2. See
Identification for BCR1 and BCR2 location.
See Figure 4-25. Set DMM to measure DC
2.
Amperage.
a. Connect the positive (+) test lead to the center
terminal of the battery charge rectifier.
b. Connect the negative (-) test lead to wire 13A
previously disconnected.
13A
66
BCR1
Figure 4-25. Testing BCR1
Section 4 AC Diagnostic Tests
Control Panel Component
77
004614
45