Motor-protective system ZEV
14
10/06 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
g
20 %.
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
(
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
(
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.
Summary of Contents for ZEV-XSW-145
Page 4: ...II ...
