Mikro MK300 User Manual

MK300 / MK300E Earth Leakage Relay User's Guide

A BRIEF OVERVIEW

j
i
h
g

1. DESCRIPTION

The MK300 and MK300E are microprocessor based numerical earth leakage relays designed to monitor the
leakage current in a electrical installation. With the use of microprocessor technology and digital signal processing
technique, the MK300 and MK300E relays are equiped with state-of-the-art digital hormonic filter to minimise
nuisance tripping.
The MK300 & MK300E relays can continuously display the leakage current on the front display panel. When the
relay trip as a result of a leakage being detected, the leakage current will be recorded. This recorded leakage
current and all the settings on the relay can be viewed at by pressing the RESET button on the relay
MK300E comes with two additonal remote control inputs. The additional inputs are remote test input and the
remote reset input. Other additional features of the MK300E include positive safety output contact and 50% pre-fault
contact.

2. LIGHT INDICATORS

The indicators display the status of the system as follow:
Indicator
Aux Trip Delay FUNC
0 0 0
1 0 0
1 0 1
1 B 0
1 0 X
1 0 X
Table 1: System Status
VL
0 0 No auxiliary supply.
0 1 Normal condition, no tripping.
Leakage current exceeded set limit,
X X
time delay coundown started.
X B Delay time lapsed and relay tripped
1 1 Scroll through setting.
B 1 Programming mode.
a
b
c
d
e
f
Status
a - Auxiliary power supply indicator
b - Relay trip status indicator
c - Time delay status indicator
d - Down key
e - Up key
f - Reset key
g - Test key
h - DP indicator
i - FUNCTION indicator
j - VALUE indicator
Symbols
I ∆n - Sensitivity setting
∆t - Time delay setting
Data - Previous tripped value
1 = ON
0 = OFF
X = don't care
B = Blinking
VL = VALUE
FUNC = FUNCTION