2.3.15 Measuring And Response Times; Password Protection (On, Off); External Test/Reset Button (T/R) - Bender ISOMETER isoCHA425HV Manual

Function

2.3.15 Measuring and response times

The measuring time is the period essential for the detection of the measured value. The measuring time is
reflected in the operating time t
necessary measuring pulse duration, which depends on the insulation resistance R
capacitance C of the system to be monitored. The measuring pulse is generated by the measuring pulse
e
generator integrated in the ISOMETER®. The measuring times for C
System disturbances may lead to extended measuring times. In contrast, the time for the system voltage
measurement U is independent and considerably shorter.
n
Operating time t
ae
The operating time t
ae
resistance measured value depends on the insulation resistance R
Response delay t
on
The response delay t
on
each alarm message specified in the alarm assignment has its own timer for t
interference suppression in the case of short measuring times.
An alarm message will only be signalled when a limit value of the respective measured value is violated for the
duration of t . Each time the limit value is violated within the time t
on
Total response time t
The total response time t
Delay on release t
off
The delay on release t
alarm message specified in the alarm assignment has its own timer for t
An alarm message will be signalled until the limit value of the respective measured value is no longer violated
(including hysteresis) for the duration of t
during t , the delay on release "toff" restarts.
off
Start-up delay t
After connecting the supply voltage U
"t" (0...10 s).

2.3.16 Password protection (on, OFF)

If password protection is activated (on), settings can only be made after entering the password (0...999). For its
activation, see chapter 4.7.

2.3.17 External test/reset button (T/R)

Functions
• Reset = press the external button < 1.5 s
• Reset + self test = press the external button > 1.5 s
• Stop measuring function = press and hold the external button
16 isoCHA425HV_D00404_04_M_XXEN/10.2023
. For the insulation resistance measured value, it is mainly determined by the
ae
is the time required by the ISOMETER® to determine the measured value. The insulation
is set uniformly for all alarm messages in the "t" menu using the parameter "ton", while
an
is the sum of the operating time t
an
can be set uniformly for all alarm messages using the parameter "toff", while each
off
off
, the alarm output is suppressed for the time set in parameter
S
and the response delay t
ae
without interruption. Each time a limit value is no longer violated
and the system leakage
F
, U , U and R % are synchronous.
e L1e L2e
and the system leakage capacitance C
F
. This delay can be used for
on
, the response delay "ton" restarts.
on
.
off
.
e
.
on