Description Of Encoder Signals; Encoder Breakage Recognition; Adjustment Of Increments Per Revolution (Ec.1); Installation And Start-Up - KEB COMBIVERT F5 Handbuch

Installation and Start-up

1.7.3 Description of encoder signals

Tracks C and D are giving an absolute signal to the control unit. The period is correspond
exactly to one mechanical revolution of the encoder. At starting the control unit will start with
this relative inaccurate absolute value. With the first zero pulse the position will be corrected.
Thus a reference point search is not necessary.
The output signals of tracks A and B are dependent on the encoder line number. If the encoder
line number, adjusted in parameter Ec.1, is not correspond with the actual encoder line number,
an error will be triggered immediately after revolution of the rotor axis.
The zero track will permanently be compared with the position. In case a difference occurs
the position will be corrected with a ramp time after a filter. In addition the position value of
the absolute track (C and D) will be compared with the position any 30 ms. Since the absolute
track is relatively inaccurate, corrections are only made until a valid zero signal is recognized.
Then only an error is released, if the difference exceeds a maximum value.
If no absolute and/or zero track is recognized during power-on, this functions are
getting deactivate. Operation with exclusively utilization of the high resolution tracks
A and B is possible.

1.7.4 Encoder breakage recognition

The recognition of encoder breakage is a software function and dependent on the encoder
type. It is possible to insert the encoder during operation. By writing on Ec.0 the initialization
starts. After fault-free initialization the correct position will be send.
The absolute track is monitored approx. all 30 ms and the incremental track is monitored
approx. all 16 ms. An error is triggered, if the permissible signal levels are fallen below.
Dependent on the encoder type the response time can be 100 ms and more.

1.7.5 Adjustment of increments per revolution (Ec.1)

The inc/r of the inverter has to correspond with the inc/r of the encoder. In case of SIN/COS
encoders the interface is not able to recognize the inc/r of the encoder and generates an error
message (status ec.37=69) after the rotation of the rotor axis.
2. Installation and Start-up
2.1

Mechanical installation

All kind of works on the inverter may be carried out by authorized personnel in accordance
with the EMC and safety rules only.
• Switch inverter de-energized and await capacitor discharge time
• Pull off operator
• Remove plastic cover
• Remove fixing bolt
• Fix interface board beginning from the socket connector straightly
• Screw in fixing bolt
• Attach plastic cover
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