Lenze LDEC Series, Системное руководство

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Function library
Monitoring
I
2
t monitoring
8
l
61
LDEDS−CCU210B EN 4.0
Description Possible settings Code
Selection Lenze Byte
< ñò
No.
C0478 SensoPart:
deceleration ramp Vx
ð
VLx for
frequency limitation distance in ...
^
57
1 RW EXT 4 50 1 {Hz/s} 255 ... Parameter set 1
2 50 ... Parameter set 2
C0610 R 4 SensoPart: current distance
^
57
0 {mm} 65535
8.6.2 I
2
t monitoring
By means of the I
2
xt monitoring, the motor utilisation is monitored. The monitoring
simulates a motor protection switch.
How to configure the motor protection switch:
ƒ
Enter the rated motor current in C0022.
ƒ
Enter the tripping class in C0121.
ƒ
Define the response in the case of overload in C0122.
(
Stop!
Possible overheating of the motor
The I
2
xt monitoring does not present a full motor protection, as the motor
temperature calculated is reset every time the mains is switched off.
Possible consequences:
ƒ
The connected motor can be overheated when the mains is switched on
again if ...
– ... the motor already is strongly heated and is continued to be overloaded.
– ... the cooling air supply is interrupted.
– ... the cooling air is too warm.
Protective measures:
ƒ
Provide for a full motor protection that is additionally equipped with a PTC
thermistor or a thermal contact in the motor.
ƒ
The PTC thermistor or thermal contact has to be wired and connected
correctly.