Function; Intended Use; Device Features - Bender ISOMETER isoES425 Manual

Function

2 Function
2.1

Intended use

The ISOMETER® isoES425 monitors the insulation resistance R
systems) for energy storage devices up to AC/DC 400 V.
DC components existing in AC systems do not influence the operating characteristics when a minimum load
current of DC 10 mA flows. A separate supply voltage U
By using the isoES425 in network operation, the connection to earth is monitored for interruptions, which are
displayed as faults. When operated as an island network, the isoES425 takes over the monitoring of the island
network (IT system).
In order to meet the requirements of the applicable standards, customised parameter settings must be made
on the equipment in order to adapt it to local equipment and operating conditions. Please heed the limits of
the range of application indicated in the technical data.
Any other use or a use that goes beyond this constitutes improper use.
To ensure that the ISOMETER® functions correctly, an internal resistance of ≤ 1 k must exist between L1/+
and L2/– via the source (e.g. PSU) or the load.
If the ISOMETER® is installed inside a control cabinet, the insulation fault message must be audible and/or
visible to attract attention.
2.2

Device features

• Monitoring of the insulation resistance R
• Measuring the system voltage U
• Measuring the DC residual voltages U
• Selectable start-up delay, response delay and delay on release
• Alarm output via LEDs ("AL1", "AL2"), display, and alarm relays ("K1", "K2")
• Automatic device self test with connection monitoring
• Selectable n/c or n/o relay operation
• Measured value indication via multi-functional LC display
• Activatable fault memory
• Automatic adjustment to the system leakage capacitance C
• Two separately adjustable response value ranges 1...990 k (prewarning, alarm)
• RS-485 (galvanically isolated) including the following protocols:
– BMS (Bender measuring device interface) for the data exchange with other Bender devices
– IsoData (for continuous data output)
• Password protection against unauthorised changing of parameters
8 isoES425_D00214_01_M_XXEN/10.2023
s
for unearthed AC/DC systems
F
(True-RMS) with undervoltage/overvoltage detection
n
(L1/+ to PE) and U
L1e
of unearthed AC, AC/DC and DC systems (IT
F
allows de-energised systems to be monitored as well.
(L2/– to PE)
L2e
up to 100 F
e