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INTERNAL COM. I/O
41:1 CHARGE CIRCUIT
The DLCU on I/O board 10 contains an arming circuit that is charged when the door lock coil is
to be activated. For safety reasons, this arming circuit must be discharged when the door lock
coil is not to be activated. If the arming circuit for operating the door lock is charged when it is
not supposed to be, an error message will be sent to the CPU. If the error ceases, the message
will not be sent to the CPU.
CPU reads the error message when the door is locked and unlocked and generates an error. The
error is ignored between these two occasions.
Cause
• The error can bee caused by overloads and/or defective components in the DLCU on I/O
board 10.
41:2 SET SIGNAL NO TACHO
The DLCU on I/O board 10 counts the tacho pulses from the motor in order to guarantee that the
drum is stationary when the door is opened. To ensure that the signal from the tacho generator
is working correctly, DLCU compares the tacho signal to a digital bit value from the CPU, which
is due to the CPU having activated the motor. The tacho signal should always correspond to the
digital bit value and if the tacho signal is not present when the digital bit value is present, an error
message will be generated to CPU.
The error message is filtered in such a way that the digital bit value should have been on for 2
seconds; if this is the case, a check is made that the pulses from the tacho sensor are present when
the digital bit value ceases.
Internally the DLCU will automatically clear an error if it disappears during program run.
CPU reads the error message when the program finishes and generates an error code, the error
message is ignored between these two occasions.
Cause
• The error can be caused by breaks in the circuits for the tacho sensor, or caused by a error
in the magnet in the tacho sensor.
• Collateral damage due to a error in the motor system.
41:3 ACTUATOR CIRCUIT
The DLCU controls the door lock actuator coil. The DLCU checks continuously that the coil is
engaged. DLCU can detect a break in the circuit (>50 kΩ) (DLCU cannot detect a short in the circuit).
If there is a break in the actuator circuit, CPU will be notified; the error code will disappear if the
error ceases.
CPU reads the error message when the program starts and finishes and generates an error code,
the error message is ignored between these two occasions.
Cause
• The error can be caused by a break in the cables between the hatch lock and the I/O board 10,
or caused by a error in the hatch lock solenoid.
• Error or break in the I/O board 10 circuits.
Summary of Contents for W555H
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