ABB REG316 4 Series - Standstill Protection Using an Overcurrent Function

ABB Switzerland Ltd REG 316*4 1MRB520049-Uen / Rev. B
4-12
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 %.
HEST 935 008 FL
U
I
Trip
Block
Function No.1 Voltage
U-Setting
Delay
= 0.85 UN
= 1.00 s
Function No.2 Delay
TRIP time
Reset time
= 0.0 s
= 20.0 s
Function No.3 Current
I-Setting
Delay
= 1.5 IN
= 0.02 s
TripTrip
Standstill
protection
Fig. 4.4 Block diagram of a standstill protection scheme
based on an overcurrent function