Data Sheet

5
70 Series - Line monitoring relay
IX-2012, www.findernet.com
Functions
Type
70.31
70.41
70.61
Phase loss and phase rotation
Neutral loss and asymmetry
Type
70.41
Output relay On (NO closed) when all OK: positive logic.
If the sequence (L1, L2, L3) is incorrect at power-on, the output
relay will not turn-on.
If a phase is lost, the output relay turns off immediately.
When the phase is again active, the output relay turns on
immediately.
For type 70.61:
Phase loss monitoring possible even under regeneration up to
80% of the average of the other 2 phases.
If the neutral is lost (and the Neutral control function is set), the
output relay turns off immediately.
When the neutral is again present, the output relay turns on
immediately
If the asymmetry (U
max
- U
min
)/U
N
is above the % set value, the
output relay turns off after the set delay T.
When the asymmetry is again below the % set value (with a fixed
hysteresis of approximately 2%), the output relay turns on after
the Switch-on lock-out time.
Asymmetry
Neutral Loss