TP-6461 1/0894 Section 6, Component Replacement, Model KSS Switches
6.6 Solenoid and Rectifier
Replacement
6.6.1 Solenoid and Rectifier
Replacement, 40--225 Amp Models
Required tools and equipment:
Basic electricians hand tools
Multimeter digital or analog
Solenoid
Tie wraps
Required protective equipment:
Rubber insulating gloves class 0
Safety glasses
Electrical hazard safety shoes
Procedure
1. Open the ATS enclosure.
2. Prevent all connected generator sets from starting.
a. Place the generator set master switch in the
OFF position.
b. Disconnect the battery charger, if equipped.
c. Disconnect the generator set engine starting
batter(ies), negative (--) lead first.
3. Disconnect main power.
4. Verify zero volts across each phase.
5. Remove DC fast-on connections from the rectifier
terminals. See Figure 6-14.
Figure 6-14 Rectifier Connections (DC solenoid
leads shown disconnected)
6. Check the coil resistance. See Figure 6-15.
Note: If the resistance reading is infinite or
shorted, replace the coil.
Figure 6-15 Checking Coil Resistance
Rectifier Check and Replacement
7. Remove the AC fast-on connections from the AC
terminals of the rectifier.
8. Check the diode operation of the rectifier. See
Figure 6-16 and Section 3.5 for rectifier test
instructions. If the rectifier is good, go to step 11. If
the rectifier is bad, continue on.
9. Remove the faulty rectifier.
10. Install the new rectifier so that the red dot is in the
upper right corner.
11. Connect the AC fast-on connections to the AC
terminals.
Note: The AC terminals are in the upper left and
lower right hand corners.
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