VAMP Ltd
Feeder and motor manager
Technical description
VAMP 257
VM257.EN002
VAMP 24h support phone : +358 (0)20 753 3264
143
5.3.5.
Voltage protection
Overvoltage stages U>, U>> and U>>> (59)
Overvoltage setting range:
50 - 150 %U
n
(U>)
50 - 160 % U
n
(U>>, U>>>)
Definite time characteristic:
- operating time
0.08
**)
- 300.00 s (step 0.02) (U>, U>>)
0.06
**)
- 300.00 s (step 0.02) (U>>>)
Release delay
0.06 - 300.00 s (step 0.02) (U>)
Hysteresis
0.1 - 20.0% (step 0.1%) (U>)
Starting time
60 ms
Resetting time
80 ms
Resetting ratio
0.97 (depends on the hysteresis setting)
Inaccuracy:
- starting
±3% of the set value
- operate time
±1% or ±30 ms
**) This is the instantaneous time i.e. the minimum total operational time including the fault
detection time and operation time of the trip contacts.
Undervoltage stages U<, U<< and U<<< (27)
Undervoltage setting range
20 - 120 % U
n
Definite time characteristic:
- operating time
0.08
**)
- 300.00 s (step 0.02) (U<)
0.06
**)
- 300.00 s (step 0.02) (U<<, U<<<)
Release delay
0.06 - 300.00 s (step 0.02) (U<)
Hysteresis
0.1 - 20.0% (step 0.1%) (U<)
Self-blocking value of the undervoltage
0 - 80 % U
n
Starting time
60 ms
Resetting time
80 ms
Resetting ratio
1.03 (depends on the hysteresis setting)
Inaccuracy:
- starting
±3% of the set value
- operate time
±1% or ±30 ms
**) This is the instantaneous time i.e. the minimum total operational time including the fault
detection time and operation time of the trip contacts.
Residual voltage stages U
0
> and U
0
>> (59N)
Residual voltage setting range
10 – 60 %U
0n
Definite time function:
- Operating time
0.3 – 300.0 s (step 0.1 s)
Start time
<300 ms
Reset time
<300 ms
Reset ratio
0.97
Inaccuracy:
- Starting
±2% of the set value or ±0.3% of the rated
value
- Operate time
±1% or ±150 ms
