Cub Cadet CC 500 EL Shop Manual page 15

Rectifier
The rectifier is a device that will take AC voltage and
change it in to DC voltage. Rectifiers are made up of
diodes. A half wave rectifier can be something as sim-
ple as a diode placed in the circuit to block the negative
half for the AC wave form. See Figure 2.17.
Negative deflections blocked
Figure 2.17
This mower uses a full bridge rectifier. That is just four
diodes wired in such a way as to take the negative side
of the AC wave form and make it positive. See Figure
2.18.
AC
power
Figure 2.18
Rectifier
11
Because the rectifier is just reversing the negative side
of the AC wave form, it does not have a smooth output
wave form. See Figure 2.19.
NOTE: For a motor, that is fine. If using elec-
tronic devices, the wave form would need to be
smoothed out.
Negative deflections have been reversed
Testing the rectifier
The rectifier can only be tested while power is supplied
to it.
CAUTION: Use extreme caution while working
with electricity. Touching the circuit while it is
energized is a shock hazard.
To test the rectifier:
1. Remove the motor cover following the steps
described in chapter 3 Repair Procedures.
2. Plug the mower in using an appropriate size
extension cord.
CAUTION: Use of the wrong sized extension
cord can result in damage to the motor or a ther-
mal failure of the cord.
Cord length
in feet
25
Wire gauge
size 16
ELECTRICAL SYSTEM
Figure 2.19
50 100
16 14
150
12