Generac Power Systems IM Series - Manual (Page 20)

Step 4 - Check Control Relay CR1
Test Procedure: Refer to Step 6 under Problem No. 1.
Test Results:
A. Control Relay CR1 checks GOOD: Go to Step 5.
B. Control Relay CR1 checks BAD: Replace Control
Relay CR1.
Step 5 - Check Stator Battery Charge Windings
NOTE: The Volt-Ohm-Mllllammeter (VOM) used to
test Stator windings must be accurate. Recom-
mended Is a digital meter of high accuracy.__________
Test Procedure: Disconnect Wires 66 and 77 (Fig. 11)
from the Battery Charge Rectifier BCR terminais. Set a
VOM to its "Rxl" scaie and zero the meter. Connect the
meter test ieads across the terminal ends of Wires 66 and
77, just removed from Battery Charge Rectifier BCR. The
VOM should indicate Stator Battery Charge Winding
resistance, as follows:
Series NP45G = 0.12 ohm
Series NP55G = 0.09 Ohm
Series NP65G = 0.07 ohm
All test readings are plus or minus 10%.
Now, set the VOM to its "Rxl 0,000" scale and zero the
meter. Connect one VOM test lead to terminal end of
Wire 66, remaining test lead to a dean frame ground. No
upscale movement of the meter should be noted (infinity).
Test Results:
A. Battery Charge Winding checks GOOD: Go to Step 6
B. Battery Charge Winding checks BAD: Replace Stator
Assembly.
Test Procedure: Inside the generator panel, locate
Resistor R1 (Fig. 12). Test wire 0 (between Resistor R1
and frame ground connection) for an open condition.
Correct open condition, if necessary, before proceeding.
Disconnect Wire 55 form the Resistor to prevent interac­
tion. Set a VOM to Ks "Rxl" scale and zero the meter.
Connect the first meter test probe to the Wire 55 terminal
of Resistor. Connect second test probe to a clean frame
ground. Meter should indicate about 1 ohm (plus or minus
5%).
Test Results:
A. Resistor R1 checks GOOD: Repeat Steps 1 through 4
under Problem No. 3.
B. Resistor R1 checks BAD: Replace Resistor R1.
Figure 12. Resistor R1
X BATTERY CHARGE
7
WINDING
66
-T
55
R1
00053
rh
GROUND
Problem No. 4 - Engine Starts Hard, Runs
Rough
Step 1 - Check Engine Ignition System
Test Procedure: Refer to ENGINE TROUBLESHOOT­
ING section. Also see ENGINE SERVICE MANUAL.
Test Results:
A. Ignition system checks GOOD: Go to Step 2.
B. Ignition system checks BAD: Repair or replace defec­
tive component(s).
Step 2 - Check Carburetlon
Test Procedure: See ENGINE TROUBLESHOOTING
section. Also see ENGINE SERVICE MANUAL.
Test Results:
A. Checks GOOD: Go to Step 3.
B. Checks BAD: Adjust, repair or replace as necessary.
Step 3 - Check Engine Compression
Test Procedure: Refer to ENGINE TROUBLESHOOT­
ING section. Also see ENGINE SERVICE MANUAL.
Test Results:
A. Engine checks GOOD: Go to Step 4.
B. Engine checks BAD: Repair as required.
18