Edition 050614
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clhr1de4ctr
20AP1:2 Fan control
The fan speed depends on the welding current. For loads up to 146 A, the fans
run at low speed, supplied at about 12 V. At load currents above 146 A, the
fans are supplied at 24 V and run at full speed. On conclusion of welding, the
fans continue to run for 6.5 minutes.
If the welding current is above 146 A and then is recuced to a lower value, the
fans continue to run at full speed for 6.5 minutes, before dropping to the lower
speed.
Machines with version 1 of the control board:
When the mains power supply is turned on, the fans start and run at full speed
for about ten10 seconds, before shutting down until welding starts.
Machines with version 2 of the control board:
When the mains power supply is turned on, the fans are off. After about 4
seconds they start and run at full speed, for a short moment, before shutting
down until welding starts.
20AP1:3 The CAN bus
A standardised communication (CAN -- Controller Area Network) bus is used
for communication between the units of the machine. Communication speed is
400 kbit/s.
The CAN bus is connected in parallel to the connectors CAN_A and CAN_B.
The +12V_Can and 0V_Can power supply is unregulated and is galvanically
isolated from other parts of the control board.
The shell of the CAN -- connectors is connected to 0V_Can. GND in the diagram
below is connected to the power unit chassis.
The CAN_A connector is connected to remote control unit connector XS3.
Connector CAN_B is used for internal communication, e.g. with the control
panel. See the machine connection diagram.
Voltage regulator VR1 supplies a 5 V power supply to the CAN circuits on
20AP1.
If the CAN bus fails, the control panel will normally generate a fault message.
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