Voltage Interruptions - Allen-Bradley Rockwell Automation 857 User Manual

10-20
Technical Data
857-UM001A-EN-P – July 2009
Voltage Sag & Swell
Table 10.46 – Voltage Sag & Swell
Voltage sag limit
Voltage swell limit
Definite time function:
- Operating time
Low voltage blocking
Reset time
Reset ration:
- Sag
- Swell
Block limit
Inaccuracy:
- Activation
- Activation (block limit)
- Operating time at definite time function
If one of the phase voltages is below sag limit and above block limit but another phase
voltage drops below block limit, blocking is disabled.

Voltage Interruptions

Table 10.47 – Voltage Interruptions
Voltage low limit (U1)
Definite time function:
- Operating time
Reset time
Reset ratio:
Inaccuracy:
- Activation
10 – 120 %
20 – 150 %
DT
0.08 – 1.00 s (step 0.02 s)
0 – 50 %
<60 ms
1.03
0.97
0.5 V or 1.03 (3 %)
±0.5 V or 3% of the set value
±5% of the set value
±1% or ±30 ms
10 – 120 %
DT
<50 ms (Fixed)
<60 ms
1.03
3% of the set value