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 (RNGR 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 Ior Uover 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. Usys (L-L) 400V
2. CD-NGRM CD1000
3. Frequency 50 Hz
4. INGR nom 5 A
5. RNGR 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 o
Menu 6.4: Response values
HRG LRG
1. UNGRTrip 60 %
2. INGR trip 60 %
3. > RNGR 150 % (HRG), 250 Ω (LRG)
4. < RNGR
(HRG only) – 50 % (HRG)
5. tNGR trip 4. tNGR trip 0 s
6. Ground-fault
trip
5. Ground-fault
trip on
7. tGF trip 6. tGF trip 5 s
8. Alarm stored 7. Alarm stored on
9. trestart 8. trestart 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
