User`s manual

apfiff09 marine vacon • 199
24-
6
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 is off synchronization 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 re-activated once a speed
error is detected (set parameter again or power down the drive).
P2.12.4.1 Speed error fault function ID752
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
Defines the limit when fault situation is noted. 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
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.