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Servicing the cell washer
4.7
Replacing the frequency converter
NOTE:
For more information about locating and identifying parts, see Section 5, “Parts”
and
Section 6, “Schematic.”
The frequency converter generates and monitors the current supply for the drive motor. It also monitors the
motor temperature and transfers the electrical energy produced during braking to the braking resistor.
If there is a problem with the frequency converter, it may need to be replaced.
You will need the following to replace the frequency converter:
►
2.5 mm Allen wrench
►
#20 TORX screwdriver
►
Standard 2-pin jumper
To replace the frequency converter
1
Remove the rotor from the cell washer, and leave the lid open.
2
Turn off the cell washer and disconnect it from power.
3
Use the Allen wrench to remove the front panel. For instructions, see Section 4.4, “Removing and
installing the front panel.”
4
Disconnect the wiring to other components. For more information, see Section 6, “Schematic.”
5
Using the TORX screwdriver, remove the four screws that secure the frequency converter board
and underlying heat sink to the interior housing, then remove the frequency converter and heat sink
together.
Left: Frequency converter. Right: Detail of one of four TORX screws that secure the
frequency converter to the interior housing.
6
Install the new frequency converter and reinstall the screws, making sure that there is sufficient heat
conduction paste between the heat sink and the interior housing. If necessary, scrape off the paste from
the old frequency converter and apply it on the new one.
7
Reconnect the wiring.
8
On the back of the front panel, locate the control/display board.
9
On the control/display board, add the 2-pin jumper and configure the jumpers for initialization mode.
For instructions, see Section 4.7.1, “Setting jumpers.”
10
Install the front panel. For instructions, see Section 4.4, “Removing and installing the front panel.”
11
Initialize the cell washer. For instructions, see Section 4.7.2, “Initializing the cell washer.”
12
Perform a functional check of the cell washer. For instructions, see Section 4.9, “Performing post-
repair checks.”
