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KFU 2-/4-
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17.7.3 Speed Sensor Monitoring
Failures of the speed sensor lead to a faulty behavior of the drive, as the measured
speed forms the foundation of the control system. By default, the speed sensor moni-
toring system continuously monitors the speed sensor signal, the track signals. If an
extension module EM is connected, the number of division marks is monitored addi-
tionally. If, while the frequency inverter is released, a faulty signal is recognized for
longer than the timeout, a fault switch-off is affected. If the parameter
Operation mode
760
is set to zero, the monitoring function is deactivated.
Operation Mode
760
Function
0
-
Off
The function is deactivated
2
-
Error
A fault message is displayed according to the timeouts set.
The speed sensor monitoring is to be parameterized in the part functions according to
the application. The monitoring function becomes active with the release of the fre-
quency inverter and the start command. The timeout defines a monitoring time in
which the condition for the fault switch-off must be fulfilled without interruption. If one
of the timeouts is set to zero, this monitoring function is deactivated.
Parameter
Settings
No.
Description
Min.
Max.
Fact. sett.
761 Timeout: Signal fault
0 ms
65000 ms
1000 ms
762 Timeout: Track fault
0 ms
65000 ms
1000 ms
763 Timeout: Direction of rotation fault
0 ms
65000 ms
1000 ms
Timeout: Signal fault
The actual speed measured is compared with the output value of the speed control-
ler. If the actual speed value is exactly zero for the time selected with the parameter
Timeout: Signal fault
761
, although a reference value is available, the fault is dis-
played with the message "F1430".
Timeout: Track fault
The actual speed measurement monitors the sequence in time of the signals in the
quadruple evaluation of the speed sensor operation mode. If the speed sensor signal
is faulty for the time selected with the parameter
Timeout: Channel fault
762,
the fault
is displayed with the message "F1431".
Timeout: Direction of rotation fault
The actual speed measured is compared with the reference speed. If the sign be-
tween reference value and actual value differs for the time selected with the parame-
ter
Timeout: Direction fault
763
, the fault is displayed with the message "F1432". The
monitoring function is reset when the drive mechanism has moved in the reference
value direction by a quarter of a revolution.