Wascomat EX-30 S and EX-50 S Operating & Maintenance Manual - page 46
46
Mechanical and electrical design
For the 220 l machine there is a cooling fan on the MCU, on account of its
higher wattage. The fan starts up automatically when the heat sink reaches
a temperature of approx. 65
°
C, which can arise during extraction if the load
is unfavourable or if the ambient temperature is high. When the machine
power supply is first switched on the fan operates for a short time.
The MCU has an interlock signal input connected to a switch in the door,
which supplies the input with main voltage when the door is locked.
PCB connector/Function
X301: Serial communication
Communications between MCU and PCU. With an interface it is
possible to connect a PC for testing machine operation/functions.
X 301:2 Gnd
X 301:3 Txd
X 301:4 Rxd
X302: Input lock sequence
An input voltage of 96-276 VAC is required to start the motor.
The function of this input is to stop/not start the motor when the door
lock is open.
Input voltage: 120 V-20 % (=96 V) - 240 V+15 % (=276 V), 50/60 Hz
Current:
Max. 0.01 A
X304: Relay output
The relay is controlled via commands from the PCU (X301). The relay is
not to be activated if communication with the PCU is lost.
Isolation voltage:
3750 V
Voltage:
250 VAC
Current:
max. 2 A
Relay connections: 1-pole, 2-way (three connections)
Connector:
X304:1
Normally open
X304:2
Normally closed
X304:3
Common
X307: Internal
For 220 l machines, this contact is used for connection of a fan for
cooling the MCU.