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JetMove 203-230 5.2 Motor Protection
Jetter AG 41
5.2.3 Motor overload calculation according to
UL
For driving motors at a servo amplifier, the UL standard requires a motor load
recognition which functions according to the following criteria:
The "trip current" is defined to be 1.15 times the user-set nominal current.
• If the average motor current corresponds to the trip current, this must lead to
deactivating the motor after a limited time.
• If the value of the average motor current equals the double value of the trip
current, the motor current must be switched off after 8 minutes as the latest.
• If the value of the average motor current equals six times the value of the trip
current, the motor current must be switched off after 20 seconds as the latest.
This motor overload protection (error message 31 will occur) can be parameterised
only through the parameter "continuous rated current".
It is always active and cannot be deactivated.
Important
As, after activating, the motor overload calculation to UL always starts with value
zero, the motor load can only be calculated correctly, if, at activating the servo
amplifier JetMove 203-230 (i.e. it has been connected to the 24 V logic power
supply) is cold.