4.5 Safety Concept
20
Insulation Monitoring (optional)
An insulation monitoring device continuously monitors the total insulation resistance of the DC-circuit
of an output channel against ground (PE) and issues a warning message or an error message if one
of the set response values is undershot. By default this values are set to:
R
〈
an
〉
1
=50
k
Ω
(Warning-threshold)
and
R
〈
an
〉
2
=25
k
Ω
(Error-threshold)
.
During monitoring a measuring current in the range of some
μ
A is superimposed onto the load current
and analyzed by a measurement circuit. The current insulation resistance as well as the thresholds
can be read from the display of the isolation monitor. Devices of the ERS series are optionally equipped
with one or two insulation monitoring devices.
⚠
WARNING
Operating the device in single channel mode safely is only possible when two insulation
monitoring devices are installed.
When there are two insulation monitoring devices one of them is automatically deactivated when
either “serial” or “parallel” mode is activated.
If the attached load features its own monitoring system, the monitoring device in the ERS can be
switched off.
If the factory-set values of the insulation monitoring are to be changed, this can be done via the
menu Alarm settings on the insulation monitor. For "Alarm 1"(warning) and "Alarm 2"(error) an insula-
tion resistance of 1
k
Ω
...10
M
Ω
can be set. Please note that the set value of "Alarm 1" should always be
greater than "Alarm 2", otherwise no warning is triggered.
The setting of the response values is done via a setting menu using the device keys and a graphic
LCD. The selected settings are stored in a permanent memory.
After switching on, the insulation monitor carries out a self-test. This takes about 15...20 s and is
normally completed before the ERS itself is ready for operation.
Further information about operation and settings of the insulation monitor iso685 from Bender can
be found on the support page
https://www.bender.de/en/service-support/downloads
.
Channelstop/Performance Level C(optional)
This option offers protection against unintentional reconnection of the DC output by integrating out-
put contactors with status feedback, as well as a channel-specific triggering with feedback.
Thereby the performance level C according to ISO 13849-1:2006 is achieved.
Channelstop/Performance Level D(optional)
This option offers protection against unintentional reconnection of the DC output by integrating re-
dundant output contactors with status feedback (safe separation), as well as a channel-specific trig-
gering with feedback.
Thereby the performance level D according to ISO 13849-1:2006 is achieved.
Quick Discharge(optional)
With this option, a connected load can be actively discharged via water-cooled power resistors. The
discharge is carried out in less than 2 seconds to less than 60
V for a maximum capacity of 1 mF and
an output voltage of 1000
V. This option can only be used while using "battery simulation" and is
activated when the respective channel is switched off
N O T I C E
When quick discharge is activated no power sources (e.g. Batteries) may connected with the ERS,
otherwise you risk overloading and destroying the resistors!