RUN EXCITE: Service & Maintenance Manual - rev. 1.5
Page 6.10
6.3. THE ENCODER DOES NOT WORK PROPERLY
First of all, check the configuration value of parameter P60 of the inverter, because of it
requires a different value according to the encoder model, mounted on the machine. In
particolar set:
• P60 = 100 in case of a HEDR encoder;
• P60 = 360 in case of an ELTRA encoder.
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 inverter stops functioning with error code
EAC 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 inverter may in
certain cases also lock out with an 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. Start the machine, bringing it to a speed of 12.6 km/h. The value of parameter D01
(inverter frequency) should be approximately 49.1 Hz;
c. Check the value of parameter D20 (encoder frequency) It should be the same as the value
shown for D01, with a tolerance of ± 2 Hz, that is to say within the range 47.1 to 51.1 Hz.
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.
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