Siemens 7SR105 Rho - Phase Reversal (46 PH REV); Figure 4-3 Logic Diagram: Phase Reversal Detection (46 PH REV)

7SR105 Rho Description of Operation
©2018 Siemens Protection Devices Chapter 1 Page 40 of 57
4.3 Phase Reversal (46 PH REV)
Gn 46 PH REV Setting is the ratio of NPS:PPS current. A high value indicates incorrect current phase rotation.
This can be used to prevent inadvertent reverse operation of the motor.
Gn 46 PH REV Setting sets the NPS:PPS current percentage pick-up.
An output is given after elapse of the Gn 46 PH REV Delay setting.
Operation of the phase reversal elements can be inhibited from:
Gn 46 PH REV U/C Guarded Operation of the undercurrent guard function
Inhibit 46 PH REV A binary or virtual input.
<
<
&
<
<
&
Inhibit 46PHREV
&
Enabled
Gn 46
PH REV
Element
Yes
Gn
46 PH REV U/C
Guarded
Gn 46
PH REV U/C
Guard Setting
I
A
I
B
I
C
Gn
46 PH REV
Setting
En
Gn 46
PH REV
Delay
46
PH Rev
Figure 4-3 Logic Diagram: Phase Reversal Detection (46 PH REV)