ABB REF 541 - Page 31

Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG
31
Start-up supervision for motors, MotStart, I
s
2
t n< (48)
Start current (for motor)
Start time (for motor)
Time-based restart inhibit limit
Countdown rate of the time counter
Stalling time permitted for rotor
Operation mode
Start counter (Read-only parameter)
Time to restart enable (Read-only parameter)
Stall input (signal for motor stalling indication;
read-only parameter)
1.0...10.0 x In
0.3...250.0 s
1.0...500.0 s
2.0...250.0 s/h
2.0...120.0 s
Not in use
I
2
t
I
2
t & Stall
0...99999
0...99999 min
Not active
Active
Operation accuracy
Start time
Reset ratio, typically
Retardation time
f/fn = 0.95...1.05: ±2.5% of set value or ±0.01 x In
f/fn = 0.95...1.50:
internal time < 22 ms
total time < 30 ms
f/fn = 0.50...0.95:
internal time < 32 ms
total time < 40 ms
0.95
< 50 ms
Three-phase overload protection for shunt capacitor banks, OL3Cap, 3I>3I< (51C)
Operate times of the overload stage Ib>
I/Ib> t [s] Standard durations [s] Standard
1.15
1.20
1.30
1.40
1.70
2.00
2.20
1799
299
58
13.5
0.9
0.29
0.1
1800
300
60
15
1
0.3
0.12
IEC 60871-1
IEC 60871-1
ANSI/IEEE 37.99, IEC
60871-1
ANSI/IEEE 37.99
ANSI/IEEE 37.99
ANSI/IEEE 37.99
ANSI/IEEE 37.99
Note! The minimum operate time is 100 ms
Start current of trip stage
Time multiplier k for trip stage
Start current of alarm stage
Operate time of alarm stage
Start current of undercurrent stage
Operate time of undercurrent stage
Setting of reconnection inhibit time t
rec
0.30...1.50 x In
0.05...2.0
0.80...1.20 x Ib
0.5...6000.0 s
0.10...0.70 x Ib
0.1...120 s
0.5...6000 s
Operation accuracies
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy at definite time mode
(alarm stage I
a
>, undercurrent stage I<)
Operate time accuracy at inverse time mode
(trip stage I
b
>)
Note! The values below apply when f/f
n
=0.95...1.05
2.5% of set value or 0.01 x I
n
Injected currents = 2.0 x start current
internal time < 32 ms
total time < 40 ms
40...1000 ms (depends on the minimum pulse width set
for the TRIP output)
Overload stages: Typ. 0.95
Undercurrent stage: Typ. 1.05
Total retardation time when the current exceeds the
start value: < 50 ms
2% of set value or 20 ms
Depends on the frequency of the current measured:
10% of theoretical value or 40 ms