Isolation From The System To Be Monitored; Monitoring The Insulation Resistance; Undervoltage/Overvoltage Monitoring; Self Test/Error Codes - Bender ISOMETER isoGEN423 Manual

Function
2.3.3

Isolation from the system to be monitored

If the device has no supply voltage U
the IT system being monitored. In this case, an insulation resistance measurement up to maximally DC 500 V
can be carried out using an insulation tester.
2.3.4

Monitoring the insulation resistance

The insulation resistance R
chapter 4.4). The value 'R1' can only be set higher than the value 'R2'. If the insulation resistance R
falls below the activated values 'R1' or 'R2', an alarm message will be signalled. If R
'R2' plus the hysteresis value, the alarm will be cleared.
2.3.5

Undervoltage/overvoltage monitoring

The two parameters ('U ˂' and 'U ˃') used to monitor the nominal system voltage U
disabled in the response-value menu 'AL' (chapter 4.4). The maximum undervoltage value is limited by the
overvoltage value.
The RMS value of the nominal system voltage U
falls below, or exceeds the limit values ('U ˂' and 'U ˃'), an alarm message will be signalled. If the maximum
permissible nominal system voltage U
even when the overvoltage limit value has been deactivated. The alarm will be deleted when the limit values
plus hysteresis (chapter 4.4.2) are no longer violated.
2.3.6

Self test/error codes

The self test checks the function of the ISOMETER®, and monitors the connection to earth as well as the
connection to the system to be monitored. The alarm relays do not switch during an automatically started self
test. For a self test started manually, the switching of the alarm relays can be set using the parameter 'test' in
the alarm assignment (menu 'out', chapter 4.5.2). During the test, the display indicates 'tES'.
When malfunctions are detected or connections are missing, the LEDs 'ON'/'AL1'/'AL2' flash. The display shows
the respective error codes ('E.xx'), and in the factory setting relay 'K2' switches. The relays can be assigned to a
device error with the parameter 'Err' in the 'out' menu in the alarm assignment.
In the event of a device error, error codes are shown in the display. Some of these are described below:
Error code
PE connection error
The connection of 'E' or 'KE' to earth is interrupted.
E.01
Action: Check connection, eliminate error. The error code will be erased automatically once the
error has been eliminated.
System connection error
The internal resistance of the system is too high or the connection of 'L1/+' or 'L2/–' to the system is
E.02 interrupted. The terminals 'L1/+' and 'L2/–' are connected incorrectly.
Action: Check connection, eliminate error. The error code will be erased automatically once the
error has been eliminated.
10 isoGEN423_D00221_05_M_XXEN
or is in stop mode, it decouples terminals 'L1/+' and 'L2/–' internally from
s
is monitored by means of the parameters 'R1' (prewarning) and 'R2' (alarm) (see
F
n
set for the ISOMETER® is exceeded, an alarm message will be initiated
n
is monitored. If the nominal system voltage U
Meaning
reaches or
F
exceeds the values 'R1' or
F
can be enabled or
n
reaches,
n