9.
RECORDS
a.
Record the 3 latest tripped faults current or “tSt” for manual trip test.
b.
The records are stored in non-volatile memory.
c.
To clear the entire record database:
•
Step 1: When the relay is healthy, press [RESET] button to step to most recent trip fault record or [FUNC] digit
shown “A”.
•
Step 2: Press [ ] and [ ] buttons simultaneously and hold for 3.5s or the [DATA] show “0”. It will clear the
entire fault records database.
10.
TECHNICAL DATA
AUXILIARY SUPPLY
RECORDS
NX330A-230A(6)....................184~276 VAC
Fault record....................... 3 latest trip fault current or “tSt”
330A-110A(6)....................94~127 VAC
for manual trip test
Rated frequency.....................50Hz or 60Hz
Storage.............................. Non-volatile memory
VA Rating...............................3 VA typical
SETTING RANGES
DIGITAL INPUT PORT
Sensitivity adjustment............ 30mA, 50mA,
Remote reset..................... N.O. Dry contact
0.10~1.00A (step=50mA),
1.00~10.0A (step=1.00A)
OUTPUT CONTACTS
Delay time adjustment........... Instantaneous,
Contact rating.................... 5A 240V ACI
0.1~3.0s (step=0.1s)
Contact arrangement.........Change over
Number of shots.....................0~30 (step=1)
Expected electrical life.......50,000 at rated current
0=Disable reclose function
Expected mechanical life...5,000,000 operations
Dead time...............................1~500sec (step=1sec)
Persistent fault time............... 0~500sec (step=1sec)
ZERO-PHASE CURRENT TRANSFORMERS
0=Disable
To operate with Mikro's ZCT series of current transformers
Reclaim time.......................... 0~500min (step-1min)
0=Disable
MECHANICAL
Lockout self reset time...........0~200hrs (step=1hour)
Mounting............................Standard DIN 96x96mm panel
0=Disable
mounting
Programmable contact...........0~6 (step=1)
Approximate weight........... 0.58kg (excluding ZCT)
INDICATORS
Pre-fault alarm....................... Red indicator
Leakage trip delay time..........Red indicator
Leakage trip........................... 7-segment display and red indicators
Manual test trip...................... 7-segment display and red indicators
ZCT connection fault..............7-segment display and red indicators
Trip records............................7-segment display
Real-time leakage current......7-segment display
11.
CONNECTION DIAGRAM
12.
CASE DIMENSION
NX330A Self-Reclosing Earth Leakage Relay
User's Manual
A BRIEF OVERVIEW
1.
DESCRIPTION
The NX330A is microprocessors based earth leakage relay with built in self-reclosing function.
The earth leakage protection module is designed for measure the low-level current flowing from the live
part of the installation to the earth in the absent of the insulation fault. A zero phase current transformer
is connected to the relay and function as the sensor for sensing the leakage current. All conductors of
the circuit to be protected shall go through the ZCT.
While the self reclosing module provide multiple number of shots operation. It also incorporates
intelligent to differentiate the transient fault or persistent fault.
Symbols
I
- Sensitivity setting
SHOTS - Nos of reclose operations
n
tDEAD - Dead time
tPF - Persistent fault monitoring time
a - DATA display
b - Trip status indicator
c - Alarm status indicator
d - DP2 indicator
e - Decrement button
f - Increment button
g - RESET button
h - TEST button
i - Model
j - DP1 indicator
k - FUNC display
a
g
c
d
e
i
j
k
b
f
h
tLAR - Lockout auto reset time
tREC - Reclaim time
RLY2 - Programmable Output contact
- Time time delay setting
Flt 1 - Fault record #1(Most recent)
Flt 2 - Fault record #2
Flt 3 - Fault record #3(Oldest)
t
90mm
70mm
96mm
96mm
SIDE
FRONT
PANEL
CUTOUT
91±0.5mm
91±0.5mm
TRIP SAFE
CONTACT*
6
2
3
4
5
7
1
9
11
12
13
14
15
L
N
AUX
8
16
10
ALARM
CONTACT
LOAD
COM
The EARTH wire
must not pass
through the ZCT
L1 L2 L3 N PE
NX330A
REMOTE
RESET
CONTACTOR
MIKRO
ZCT
NO
NC
COM
NO
NC
▼
▲
NX 330A
TEST
RESET
NX
