S0740 800 179/E071123/P64
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ct33f3soft
Soft starting
We recommend soft starting of the machine after replacing control circuit board 20AP1,
power supply board 2AP1 and circuit boards or components in the power module. Soft
starting supplies the power module with a low voltage in order to avoid injury to persons or
damage to components.
It is a good idea to use soft starting when fault tracing.
Special equipment
To soft--start the machine you need soft--starting tool SST 1, this is described on page 42.
Instructions
1. Disconnect wires 1501, 1502, 1503, 1504, red and yellow from circuit boards 2AP1 and
15AP1, see the circuit diagram below.
Disconnections prior to soft starting
2. Connect the 230 V AC input of the SST 1 to terminals B2 and B4 on circuit board
2AP1.
3. Connect the 325 V DC output of the SST 1 to terminals F1 and F3 on circuit board
2AP1.
The SST 1 connected to 2AP1
4. Disconnect connector 20XS4 from terminal PS of power supply board 2AP1. Connect
the voltage test cable of the SST 1 to terminal PS of power supply board 2AP1.
5. Connect the power source to the mains and turn on the mains switch.
6. Verify the output voltages from 2AP1, all LEDs on the SST 1 must light.
7. Switch off the machine. Disconnect the voltage test cable and reconnect connector
20XS4 to terminal PS of circuit board 2AP1.
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