Westerbeke 6.5KW - Page 100

Low Voltage Output
1. Verify voltage output at generator output leads with load applied
to generator, check no load condition also. Check voltage at the
load. Check rating for generator and verify load with amp probe
at output leads. Check all connections to insure they are clean
and secure. Insure that the wire size carrying the voltage to the
load is of sufficient size so as not to produce a voltage drop.
NOTE: Beware of motor starting loads and the amperage draw placed
on the generator from these types of loads. Generally, the
amperage draw of a motor at start up will be 3 - 5 times the
amperage needed when running.
2. Check generator with Hertz meter:
No Load Hertz
No Load Voltage
No Load Voltage
3. Test Bridge Rectifier:
61 - 61.5 (51 - 51.5)
131 - 135 Volts (Generator Cold)
126 - 130 Volts (Generator Hot)
Bridge rectifier may be faulty and should be checked as follows.
(1) Set ohmmeter
scale on Rxl
(+DC) zero the
meter.
(2) Connect the (+)
lead from the
meter to point
#4, with the
(-) lead from the
meter momentarily
contact points
iI, i 2 , i 3 and
i5. No deflec-
tion of the
needle should
occur showing
iI)finite
resistance.
(3) Remove the (+)
lead from Point
Point #5
(Rectifier Mounting Hole)
____ -Point #3
i4 and connect the (-) lead to Point i4 and with the (+)
lead, momentarily touch Points iI, i2 and i3. Points #1 and
i3 should show an a-ohm resistance +2 ohms. Point i2 shoudl
show a 40-ohm resistance +5 ohms.
(4) Touch
Point i5 with the (+) lead, no deflection of the needle
should occur. IF THE RECTIFIER FAILS ANY OF THE ABOVE TESTS,
IT IS DEFECTIVE AND SHOULD BE REPLACED.
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