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 e

ntire 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 re

Delay time adjustment........... Instantaneous, Contact rating.................... 5A 240V ACI

Number of shots.....................0~30 (step=1) Expected electrical life.......50,000 at rated current

Dead time.....................

Persistent fault time............... 0~500sec (step=1sec) ZERO-PHASE CURRENT TRANSFORMERS

Reclaim time.......................... 0~500min (step-1min)

Lockout self reset time........... 0~200hrs (step=1hour) Mounting............................Standard DIN 96x96mm panel

Programmable contact...........0~6 (step=1) Approximate we

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-segm

11.

CONNECTION DIAGRAM

12. CASE DIMENSION

..........1~500sec (step=1sec)

AUX

TRIP SAFE CONTACT*

COM

9 11 12 13 14 15

96mm

FRONT

▼

▲

0.10~1.00A (step=50mA),

1.00~10.0A (step=1.00A) OUTPUT CONTACTS

0.1~3.0s (step=0.1s) Contact arrangement.........Change over

0=Disable reclose function Expected mechanical life...5,000,000 operations

0=Disable To operate with Mikro's ZCT series of current transformers

0=Disable MECHANICAL

0=Disable mounting

ent display

REMOTE RESET

62 3 4 5 71

ALARM CONTACT

NX330A

COM

1610

L1 L2 L3 N PE

set..................... N.O. Dry contact

ight........... 0.58kg (excluding ZCT)

MIKRO ZCT

CONTACTOR

LOAD

The EARTH wire must not pass through the ZCT

90mm 70mm

SIDE

91±0.5mm

PANEL CUTOUT

91±0.5mm

NX330A Self-Reclosing Earth Leakage Relay User's Manual

A BRIEF OVERVIEW

NX 330A

TE S T

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

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 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.

Flt 1 - Fault record #1(Most recent)

Flt 2 - Fault record #2

Flt 3 - Fault record #3(Oldest)

RE S E T

Symbols

I - Sensitivity setting

- Time time delay setting

SHOTS - Nos of reclose operations

tDEAD - Dead time

tPF - Persistent fault monitoring time

tREC - Reclaim time

tLAR - Lockout auto reset time

RLY2 - Programmable Output contact

phase current transformer

2. LIGHT INDICATORS

LED

display

indicator

display

00000

No auxiliary supply

00XX1

Normal condition, no tripping

0BXXX

Leakage current > 50% of the I∆n

0FBXXX

Leakage current > 85% of the I∆n. Trip delay time running.

1100B

Relay tripped

00101

Scroll through setting

00111

Scroll through records

00B01

[DATA] programming mode

11XX“Ct”

ZCT connection fault

XXXX“tSt”

Manual trip test

XXXX“Loc”

Transient fault lockout by reclose function

XXXX“PLo”

Persistent fault lockout by reclose function

[FUNC]

[DP1]

[DP2]

Symbols

Description

Blank

Off

Note 1

Real-time leakage current display (Default)

OffOnI∆n

Sensitivity setting (A)

Off

On∆t

Trip time delay setting (second)

Off

SHOTS

Nos of shots / reclose operations

Off

tDEAD

Dead time (sec)

Off

tPF

Persistent fault monitoring time (sec)

Off

tREC

Reclaim time (min)

Off

tLAR

Lockout automatic reset time (hours)

Off

RLY2

Programmable contact

AOnNote 1

Flt 1

Fault record #1 (Most recent)

bOnNote 1

Flt 2

Fault record #2

cOnNote 1

Flt 3

Fault record #3 (Oldest)

[DATA]

Pre-fault Alarm

Leakage Trip

Manual Test Trip

Re-close Lockout

ZCT Connection Fault

2XXXX

3X√√√

4XX

X√X

6XXX√

√

Terms

Description

Dead time

Time when the trip safe contact de-activated due to leakage fault or manual test trip to the Reclaim time

Time required by the recloser to reset back to initial state since the last reclose operation

Lockout automatic

Time required for unlock and reset the self-reclosing module during lockout state. The

[Trip]

[Alarm]

[FUNC]

Table 1: Relay status displayed

1 = ON 0 = OFF X = Don't care B = Normal blink FB = Fast blink

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-f 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 th

• When step through the parameters, press [RESET] button and hold for 1.5 second to jump direct to the default

[FUNC].

[DP1]

[DATA]

Status

ault alarm condition then follow by 1.5s testing on

e various parameters.

• 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 t

• 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.

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.

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 Contac

0 X X X X X

Table 3: Programmable contact selection table

X = Disable √ = Enable

SELF-RECLOSE

Shots Nos of self-reclosing operation before lockout.

Persistent fault monitoring time

▲

▼

▲

√ √ √ √ √

√ √ √ √

time when the trip safe contact is activated by the recloser.

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.

he programming mode.

▲

▼

√

Table 2: List of [FUNC] code displayed Note 1: If DP2 is OFF. The unit for the [DATA] displayed is in mA.

d. Parameters Setting

• Step 1: Press [RESET] button to step to desired parameter.

If DP2 is ON. The unit for the [DATA] displayed is in ampere (A).

reset time

Transient fault lockout When the number of self reclosing operations match the number of shots setting, further

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

unlock operation is carry out when no operators attended the relay during lockout state.

fault trip will perform the l ockout.

Leakage

Trip Safe Contact

Dead Time

Persistent Fault

Lockout

Mikro NX330A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual