Eaton ZEB Series, Руководство пользователя

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Tripping characteristics
39
10/13 MN03402007Z-DE/EN
Phase failure
ZEB overload relays are phase-loss sensitive.
In the event of a phase loss, i.e. a phase imbalance
f
50 %
causes a trip of 10 seconds ±2 %.
h
If a ZEB relay is to monitor an AC motor, the current must
be fed on all three poles in order to prevent early tripping.
DC motors cannot be monitored.
 DANGER
The device settings of the ZEB allows a deactivation of the
phase lost sensitivity (
a
Section “Device settings”,
page 48 ).
When using the ZEB overload relay to protect motor in
potentially explosive environment, do not deactivate the
phase lost sensitivity to avoid a potential motor overhea-
ting.