- 76 -
9.3.10 Earth leakage relay
The Earth relay option provides a detector that will
trip the main circuit breaker Q1 when an earth fault
current is detected.
Q1 .......Main circuit breaker
X1 .......Main power supply (400 Vac)
Terminals L1, L2, L3, N (= neutral) and PE
(= earthing), hidden behind the control panel
door and behind a small transparent door.
N13 .....Earth leak detector
Detects and indicates an earth fault current
and activates the main circuit breaker Q1.
The detection level can be set at 30 mA fixed
with instantaneous trip but can also be
adjusted between 0.1 A and 1 A with time
delayed (0 - 0.5 sec) trip. N13 has to be reset
manually after eliminating the problem
(reset button marked R). It can be overridden
by means of the earth leak switch (S13,
labelled I
ΔN) but has to be tested monthly
by pushing test button T13.
S13 .....Lock-out switch for earth fault
protection (N13)
This switch is located inside the cubicle and
is labelled I
ΔN.
Position O: No tripping of the main circuit
breaker Q1 when an earth fault occurs.
Position 1: Tripping of the main circuit
breaker Q1 when an earth fault occurs.
X1
N13
X
View ”X”
S13
Q1
Position O will only be used in
conjunction with an external earth
fault protection unit (e.g. integrated
in a distribution board).
If S13 is in position O, proper
earthing is of the utmost importance
for the safety of the user.
Eliminating any earth fault
protection can lead to serious injury
or even death for anybody touching
the unit or the load.
To Next Page
Loading...
Need help?
General
