Bender NGRM700 - Field Calibration (Menu 6.7)

Menu
50
NGRM7xx_D00292_07_M_XXEN/02.2022
Legend, Tab. 7.7
1)
Fail-safe: The relay is energized during normal operation and is de-energized in the event of
a fault ("fail-safe")
Non-fail-safe: The relay is de-energized in normal operation and is energized in the event of a
fault ("non-fail-safe")
2)
When set to "on", the function of the relay is checked during a test by switching it.
3)
Analogue output (menu 6.6.4)
Either NGR current I
NGR
or NGR resistance R
NGR
(HRG devices only) can be assigned to the
analogue output. In doing so, the voltage or current is proportional to the measured value.
See „chapter 9.1 Analogue output (menu 6.6.4)“ for more details.
7.9.7 Field calibration (menu 6.7)
During field calibration, all tolerances of the connected CD-series coupling device and
the NGR are considered. The current measured value is calibrated to the set nominal
value of the NGR (R
NGR nom
).
In order to achieve high accuracy, start the device and let it run for at least one hour in
the operating environment before carrying out the field calibration.
For the field calibration the device must be in auto mode
(menu 6.3.1 = auto).
If the digital input I1 is used with "Digital 1 > NGR method" (menu 6.6.5.3),
"Method > external" (menu 6.3.1) must be selected and I1 must be active
(refer also to page 44).
The trip relay is switched during field calibration!