Bender ISOMETER isoCHA425 Manual page 10

Function
Internal device errors E.xx can be caused by external disturbances or internal hardware
errors. If the error message occurs again after restarting the device or after a reset to
factory settings (menu item "FAC") , the device must be repaired. After eliminating the
fault, the alarm relays switch back automatically or by pressing the reset button. The self
test can take a few minutes.
It can be suppressed for the duration of the device start by setting the parameter in the
menu "SEt" to "S.Ct = off". This allows the ISOMETER® to enter measurement mode quickly
after connecting the supply voltage U
Automatic self test
The device runs a self test after connecting the supply voltage U
lectable at „t" menu on page 17 : off, 1h, 24 h).
Manual self test
By pressing the external test/reset button or the test button "T" on the device for > 1.5 s,
a self test is started. While holding down the test button "T", all device-relevant display
elements appear on the display.
3.2.7 Malfunction
In addition to the described self test, several functions in the insulation monitoring de-
vice are continuously checked during operation. If a fault is detected, the device error
("Err") will be signalled, the error code "E.xx" appears on the display as an identifier for the
error type xx and the LEDs "ON"/"AL1"/"AL2" will flash.
If the error occurs again after restarting the device or after restoring the factory settings,
please contact Bender Service.
3.2.8 Signalling assignment of the alarm relays K1/K2
The notifications for "device error," "insulation fault", "insulation impedance fault",
"undervoltage/overvoltage fault", "device test" and "device start with alarm" can be as-
signed to the alarm relays via the "out" menu. An insulation fault is indicated by the
messages "+R1", "-R1", "+R2" and "-R2". Messages "+R1" and "+R2" indicate an insulation
fault assigned to conductor L+, and the messages "-R1" and "-R2" indicate an insulation
fault assigned to conductor L-.
The message "test" indicates a self test.
The message "S.AL" indicates a so-called "device start with alarm". After connecting to the
supply voltage U and setting the parameter value to "S.AL = on", the ISOMETER® starts
s
with the insulation measured value R
be cleared only when the measured values are up-to-date and no thresholds are ex-
ceeded. In the factory setting "S.AL = off", the ISOMETER® starts without an alarm. It is
recommended that the value set for the "S.AL" parameter value is identical for both re-
lays.
10
.
s
and later every 24 h (se-
s
= 0 Ω and sets all activated alarms. The alarms will
F
Function
3.2.9 Measuring and response times
Operating time
ae
The operating time t is the time required by the ISOMETER® to determine the measured
ae
value. For the insulation measuring value R
voltages U und U and the fault location R%, it is dependent on the insulation re-
L+e L-e
sistance R and the system leakage capacitance C
F
longer operating times. The measuring time of the mains voltage U
this and significantly shorter.
Response delay
on
The response delay t can be set uniformly for all messages in the "t" menu using the
on
parameter "ton", whereby each alarm message specified in the alarm assignment hast its
own timer for t . This delay time can be used for interference suppression in the case of
on
short measuring times.
An alarm will only be signalled when a threshold value of the respective measuring value
is violated for the period of t without interruption. Every time the threshold value is vi-
on
olated within the time t , the response delay "ton" restarts once again.
on
Total response time
an
The total response time t is the sum of the operating time t
an
time t .
on
Delay on release
off
The delay on release t can be set uniformly for all messages in the "t" menu using the
off
parameter "toff", whereby each alarm message specified in the alarm assignment hast its
own timer for t . An alarm will continuously be signalled until the threshold value of the
off
respective measured value is not violated (including hysteresis) for the period of t
without interruption. Each time the threshold value is not violated for the period of t
the delay on release "toff" restarts once again.
Start-up delay
After connection to the supply voltage U
(0...10 s) in the parameter "t" is suppressed.
, the system leakage capacitance C
F
. System interferences can lead to
e
is independent of
n
and the response delay
ae
the alarm indication for the preset time
S
isoCHA425_D00352_01_M_XXEN/10.2019
, the
e
off
,
off