CYG PRS-7367 - Principle; Settings

Protection Functions
PRS-7367 227
Signal
Description
Str
The start signal
Op
The operation signal.
3.50.2 Principle
The locked-rotor protection automatically exits during the starting process of the motor, and is
automatically put into operation after starting. It is used for the locked-rotor protection that occurs
during the normal operation of the motor. The locked-rotor protection current is composed of
positive sequence current, with IA1, IB1, and IC1 being the positive sequence current of the
terminal current. The locked-rotor protection time is set according to the maximum allowable
locked-rotor operation time.
MDZS_EnaSET
Ia>MDZS_Cur_StrANA
SIG MST_Str
MDZS Op
SIG
Ib>MDZS_Cur_StrANA
Ic>MDZS_Cur_StrANA
&
1
MDZS_T_Op
MDZS Str
SIG
T_MStr
Figure 3.50-2 The locked-rotor protection logic
3.50.3 Settings
No
Name
Values(Range)
Unit
Step
Default
Description
1.
MDZS_Ena
0~1
-
1
0
MDZS enable
2.
MDZS_Cur_Str
0.04~20In
A
0.01
20In
MDZS current startup setting
3.
MDZS_T_Op
0.00~60
s
0.1
0.02
MDZS operating time delay