Standstill Protection Using An Overcurrent Function - ABB REG316 4 Series Operating Instructions Manual

ABB Switzerland Ltd
4.2.2.2.

Standstill protection using an overcurrent function

The overcurrent function is enabled by an undervoltage function,
if the period without voltage exceeds a given time.
The standstill protection scheme comprises the following items:
an overcurrent function "Current"
an undervoltage function "Voltage"
a timer "Delay".
The block diagram can be seen from Fig. 4.4. The computing re-
quirement is 23 %.
U
I
Fig. 4.4
4-12
Function No.1 Voltage
U-Setting = 0.85 UN
Delay = 1.00 s
Function No.3 Current
I-Setting
Delay
Block diagram of a standstill protection scheme
based on an overcurrent function
REG 316*4 1MRB520049-Uen / Rev. B
Function No.2 Delay
Trip
TRIP time
Reset time
Block
= 1.5 IN Trip
= 0.02 s
Standstill
protection
Trip
= 0.0 s
= 20.0 s
HEST 935 008 FL