Mikro NX330A User manual

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
kb
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*
62 3 4 5 71
9 11 12 13 14 15
LN
AUX
8
1610
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
TE S T
RESET
NX

2. LIGHT INDICATORS
[Trip]
LED
[Alarm]
LED
[FUNC]
display
[DP1]
indicator
[DATA]
display
Status
0
0
0
0
0
No auxiliary supply
0
0
X
X
1
Normal condition, no tripping
0
B
X
X
X
Leakage current > 50% of the I
∆
n
0
FB
X
X
X
Leakage current > 85% of the I
∆
n. Trip delay time running.
1
1
0
0
B
Relay tripped
0
0
1
0
1
Scroll through setting
0
0
1
1
1
Scroll through records
0
0
B
0
1
[DATA] programming mode
1
1
X
X
“Ct”
ZCT connection fault
X
X
X
X
“tSt”
Manual trip test
X
X
X
X
“Loc”
Transient fault lockout by reclose function
X
X
X
X
“PLo”
Persistent fault lockout by reclose function
Table 1: Relay status displayed
1 = ON 0 = OFF X = Don't care
B = Normal blink FB = Fast blink
3. PUSH BUTTONS OERATION
a. Integral Trip Test:
•Press the [TEST] button and hold for 3.5s to perform an integral test on the relay ranging from the analog
sensing circuitry to output contacts of the relay as well as the relay indicators and display.
•During the testing process, the first 2s is to simulate the pre-fault alarm condition then follow by 1.5s testing on
the trip time delay. End of time delay, relay trip.
b. Trip Reset; Lockout Reset and ZCT Connection Fault Reset:
•Press the [RESET] button once or through digital input port.
•ZCT connection fault reset is inhabited if the fault is not rectify
c. Parameters Viewing:
•When the relay is operate normal and no tripping, press [RESET] button to step through the various parameters.
•When step through the parameters, press [RESET] button and hold for 1.5 second to jump direct to the default
[FUNC].
[FUNC]
[DP1]
[DP2]
Symbols
Description
Blank
Off
Note 1
Real-time leakage current display (Default)
1
Off
On
I
∆
n
Sensitivity setting (A)
2
Off
On
∆
t
Trip time delay setting (second)
3
Off
Off
SHOTS
Nos of shots / reclose operations
4
Off
Off
tDEAD
Dead time (sec)
5
Off
Off
tPF
Persistent fault monitoring time (sec)
6
Off
Off
tREC
Reclaim time (min)
7
Off
Off
tLAR
Lockout automatic reset time (hours)
8
Off
Off
RLY2
Programmable contact
A
On
Note 1
Flt 1
Fault record #1 (Most recent)
b
On
Note 1
Flt 2
Fault record #2
c
On
Note 1
Flt 3
Fault record #3 (Oldest)
Table 2: List of [FUNC] code displayed
Note 1: If DP2 is OFF. The unit for the [DATA] displayed is in mA.
If DP2 is ON. The unit for the [DATA] displayed is in ampere (A).
d. Parameters Setting
•Step 1: Press [RESET] button to step to desired parameter.
•Step 2: Press [ ] and [ ] buttons simultaneously and hold for 1.5s to enter programming mode. The [FUNC]
digit blink to indicate the relay has enter into the programming mode.
•Step 3: Press [ ] or [ ] button to increase or decrease the parameter value.
•Step 4: To save the selected value, press [ ] and [ ] buttons simultaneously and hold for 1.5s. It will exit the
programming mode with [DATA] displaying the new setting.
•To exit programming mode without saving the selected setting, press the [RESET] button once.
4. DIGITAL INPUT PORT
a. The digital port is for remotely reset the relay when tripped, lockout or ZCT connection fault.
b. To reset the relay, make a connection between terminals 5 and 6 of the relay.
5. OUTPUT CONTACTS
a. Trip Safe Contact:
•Activated and latch when the relay is in normal power-up condition with the measured leakage current less than
0.85 I∆n. De-activated during leakage trip, manual test trip or ZCT connection fault.
b. Programmable Contact:
[DATA]
Pre-fault Alarm
Leakage Trip
Manual Test Trip
Re-close Lockout
ZCT Connection Fault
0 X X X X X
1
√ √ √ √ √
2
X
X
X
X
√
3
X
√
√
√
X
4
X
X
X
√
X
5
√ √ √ √
X
6
X
X
X
√
√
Table 3: Programmable contact selection table
X = Disable √ = Enable
6. SELF-RECLOSE
Terms
Description
Shots Nos of self-reclosing operation before lockout.
Dead time
Time when the trip safe contact de-activated due to leakage fault or manual test trip to the
time when the trip safe contact is activated by the recloser.
Persistent fault
monitoring time
Fault detected immediately after the trip safe contact is activated by the recloser is called
persistent fault. An time frame for monitor the persistent fault is called persistent fault time.
Reclaim time
Time required by the recloser to reset back to initial state since the last reclose operation
Lockout automatic
reset time
Time required for unlock and reset the self-reclosing module during lockout state. The
unlock operation is carry out when no operators attended the relay during lockout state.
Transient fault lockout When the number of self reclosing operations match the number of shots setting, further
fault trip will perform the lockout.
Persistent fault lockout Relay lockout when the tripping is initiated by the persistent fault
Table 4: Self reclose function explanation
a) Shots, Dead Time and Reclaim Time b) Persistent Fault Monitoring Time
Leakage
Trip Safe
Contact
Dead Time
Reclaim
Time
Shots
Counter
0120
Leakage
Trip Safe
Contact
Dead Time
Persistent
Fault
Lockout
▲
▲
▲
▼
▼
▼