Generac 86640 - Manual (Page 20)

Using the Troubleshooting Flow Chart
When a problem occurs with an RV/IM series generator
set, the first step is to determine exactiy what that problem is.
The nature of the problem can usually be found by checking
the unit’s no-load AC output voltage and frequency. This is
Test 1 in the Flow Chart. A check of the no-load voltage and
frequency will usually end with one of the following results;
1. Voltage and frequency are both good. If this is the case,
the next step is to check voltage and frequency with electrical
load applied.
2. Voltage and frequency are both high or bw, usually an
engine governor problem, I.e., governed speed too high or
too low.
3. Voltage is low, but AC frequency is good. The cause of
this problem can often be found by perfomiing a "Fixed
Excitation" test
4. Voltage and frequency read "zero".
Once the nature of the problem is defined, the cause of
the problem can usually be found by following the explana­
tions and arrows in the Flow Chart
Use the'TROUBLESHOOTING FLOWCHART in con­
junction with test instructions in Section 1.6, 'TROUBLE­
SHOOTING TEST PROCEDURES'.
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