Electronic Speed Regulator - Atlas Copco QAS 14 Kd S5 ESF Instruction Manual

Table of Contents

Q1 ....... Main circuit breaker

Interrupts the power supply to X1 when a

short-circuit occurs at the load side, or when

the earth leak detector (30 mA) or the

overcurrent

protection

is activated or when the shunt

QAS 20: 32 A)

trip is energized. It must be reset manually

after eliminating the problem.

X1 ....... Main power supply (400 V AC)

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 0.03 A 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 IΔN) but has to be tested monthly

(by pushing test button T).

S13 ..... Lock-out switch for earth fault

protection (N13)

This switch is located inside the cubicle and

is labelled IΔN.

(QAS 14:

20 A,

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.

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

Eliminating

protection can lead to serious injury

or even death for anybody touching

the unit or the load.

2.4.3