Vacon apfiff09 marine, Applications Manual, Page: 238 / 310

apfiff09 marine VACON®
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7.12.4 Speed Error
The Speed error monitoring function compares the encoder frequency and the ramp generator
output. The function is used with a PMS motor to detect if the motor synchronization is off or to
disable the open loop function using the encoder speed for slip compensation. The slip
compensation is disabled regardless of the response and needs to be activated again once a speed
error is detected (set parameter again or power down the drive).
Note: Disable P2.3.12.2 CLRmpFollEncFreq parameter if drive is used for hoisting and this for
detecting runaway load.
P2.12.4.1 Speed error fault function ID752
“Speed Error Mode”
Defines the fault function when the speed reference and the encoder speed are above
the set limits.
0 = No response
1 = Warning
2 = Fault, stop mode after fault always by coasting
P2.12.4.2 Speed error maximum difference ID753
“SpeedErrorLimit”
Defines the limit when fault situation is noticed. The difference between the speed
reference and the encoder speed. Percentage value is in relation to motor nominal
frequency.
+ 5 %
- 5 %
P2.12.4.3 Speed error delay ID754
“Speed Fault Delay”
Defines the delay after which a speed error is considered as a fault.
When used to disable open loop slip compensation based on encoder frequency, it is
recommended to set this time to zero to avoid a speed jump at the time of encoder
malfunction.
P2.12.4.4 Over Speed Protection ID1812
“OverSpeed F Resp”
Response when motor speed minimum or maximum speed is exceeded by 5 Hz.