RUN MED: Service & Maintenance Manual - rev. 1.0
Page 6.6
6.2. THE ENCODER DOES NOT WORK PROPERLY
A fault in the tread-belt motor encoder may result in the following:
1. Failure to function
In this case the encoder does not generate any pulses. The AT driver stops functioning with error
code EdA and the machine displays the “SPEED ERROR” message. Also, the value of parameter
PAR 13 is set to 1.
When the machine is next switched on, it will function in open loop mode, i.e. ignoring the encoder
signal.
2. Incorrect operation
In this case the encoder generates pulses, however their frequency is incorrect. This will cause the
tread belt to move jerkily, much like when a motor phase is disconnected. The AT driver may in
certain cases also lock out with an OC (overcurrent), OU (overvoltage) or UU (undervoltage) error.
However these errors can be misleading!
To make sure that the encoder is working properly, carry out the following procedure:
a. Set parameter PAR 13 to 1, in order to use the machine in open loop mode;
b. Access the manual inverter test function as described in paragraph 6.1.2.2 “Man. Inverter
Test”.
c. Bring the frequency to a value approximately between 4920 and 4970 Hz, by varying the
speed. When in this frequency range, the speed should be equal to 12.6 ± 0.6 km/h;
If this is the case, the encoder is working correctly. Otherwise, replace the encoder or check its
fixing onto the motor shaft.
After finishing, remember to reset the value of parameter PAR 13 to 0.
To Next Page
Loading...
