Function
17
isoPV425_D00028_09_M_XXEN/05.2018
3.2.2 Undervoltage/overvoltage monitoring
In the response value menu "AL" (see Chapter 5.3), the parameters ("U <" and
"U >") for monitoring the nominal system voltage U
n
can be activated or de-
activated. The maximum undervoltage value is limited by the overvoltage
value.
The r.m.s. value of the nominal system voltage U
n
is monitored. If the nominal
system voltage U
n
reaches, falls below or exceeds the limit values ("U <" or
"U >"), an alarm will be signalled. If the maximum permissible nominal system
voltage U
n
set for the ISOMETER® is exceeded, an alarm message will be initi-
ated even when the overvoltage limit value has been deactivated. The alarm
will be deleted when the limit values plus hysteresis (see Chapter 5.3.1) are no
longer violated.
3.2.3 Self test/error codes
The integrated self test function checks the function of the insulation moni-
toring device, and connection monitoring checks the connections to the sys-
tem to be monitored. The alarm relays are not switched during the self test.
This can be changed using the parameter "test" in the alarm assignment
(menu "out", Chapter 5.4.2). During the test, the display indicates "tES".
When malfunctions are detected or connections are missing, the LEDs "ON"/
"AL1"/"AL2" flash. The respective error codes ("E.xx") will be indicated on the
display and the relay "K2" switches.
The relays can be assigned to a device error with the parameter "Err" in the
"out" menu in the alarm assignment.
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