2. System settings of the relays (menu 6.5)
The factory setting for the relays is fail-safe. In the case of
a test, the relays change state.
i
Fail-safe: The relay is energized during normal op-
eration 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")
3. Field calibration (menu 6.6)
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 nomi-
nal 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.
i
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. The trip relay is switched
during field calibration!
4. RMS trip signal, fundamental frequency,
harmonics
The measured value which causes tripping can be select-
ed via the "Trip signal" parameter (menu 6.4.11). Trip sig-
nal can be:
• RMS
: The RMS value of
I
or
U
over the entire fre-
quency range (up to approx. 3.8 kHz).
• Fundamental frequency
: Only the RMS value of
the fundamental frequency (50 or 60 Hz).
• Harmonics
: The filtered RMS value on the selected
range of harmonics with
H0 = DC; H1 = fundamental frequency; H2 = 2 x funda-
mental frequency; … H32 = 32 x fundamental frequency
i
In the "Harmonics" measured value display (menu
2) all spectral lines are always displayed. This is in-
dependent of the trip signal setting.
i
On the standard display, the
trip signal
is indicat-
ed as
resistance
(in Ω or %)
or
as
current
(in A or
%). The setting is entered in "Display" (menu 5).
5. Initial measurement
During device start, all measured values are recorded.
Factory settings
Menu
Factory settings
Menu 6.1: HRG/LRG system
1.
U
sys (L-L)
400 V
2. CD-NGRM
CD1000
3. Frequency
50 Hz
4.
I
NGR nom
5 A
5.
R
NGR nom
150 Ω
Menu 6.2: CT
1. CT primary
600
2. CT secondary
1
3. CT connection
50 mA
Menu 6.3: NGR
1. Method
auto
2. Filter
off
Menu 6.4: Response values
HRG
LRG
1.
U
NGR Trip
60 %
2.
I
NGR trip
60 %
3. >
R
NGR
150 % (HRG), 250 Ω (LRG)
4. <
R
NGR
(HRG only)
–
50 % (HRG)
5.
t
NGR trip
4.
t
NGR trip
0 s
6. Ground-fault
trip
5. Ground-fault
trip
on
7.
t
GF trip
6.
t
GF trip
5 s
8. Alarm stored
7. Alarm stored
on
9.
t
restart
8.
t
restart
5 s
10. Max. no. of
restarts
9. Max. no.
restarts
2
11. Trip signal
10. Trip signal
RMS
12. Upper limit
harmonic
11. Upper limit
harmonic
32
13. Lower limit
harmonic
12. Lower limit
harmonic
0
NGRM500 (HRG), NGRM550 (LRG)
NGRM5xx_D00373_08_Q_XXEN/11.2022 7
