Motor-protective system ZEV
14
11/01 AWB2300-1433GB
Phase failure
In the event of a phase failure, i.e. with an imbalance of
f 50 %, the unit is tripped within a delay time of
2.5 seconds g20 %.
Earth fault monitoring
In addition to standard motor-protective functions, such as
the protection from overload or phase failure and imbalance,
the device is also equipped with a thermistor input for direct
temperature monitoring and with the option of monitoring
earth faults via an auxiliary core-balance transformers.
Table 4: Core-balance transformers for earth fault monitoring
In addition to the message shown on the display of the ZEV
(a fig. 30 on Page 31), the "earth fault" signal can also be
used to switch over one of the contacts 05-06 or 07-08
(a fig. 7 on Page 18).
Core-balance
transformer
Opening
diameter
Fault current
mm A
SSW40-0,3 40 0.3
SSW40-0,5 40 0.5
SSW40-1 40 1
SSW65-0,5 65 0.5
SSW65-1 65 1
SSW120-0,5 120 0.5
SSW120-1 120 1
Caution!
An earth fault does not lead to a changeover of the
contacts 95-96 and 97-98.
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