M&C TechGroup MP47 Ex Operator's manual - Handbuch (Seite 92)

KNF Motor M 56 Ex Installation and connection
Translation of orignal Operating and Installation Instructions, english, KNF 121220-121648 01/13 12
or mechanical effects, so that in operation the protection
against explosion remains effective.
Î When selecting cables and wiring, the general requirements for
use in potentially explosive atmosphere must be met (see EN
60079 or DIN VDE 01 65). In particular, cables and wiring must
be chosen to withstand the expected mechanical, chemical,
and thermal conditions.
Î When routing cables and wiring, and making connections, the
necessary conditions and safety measures must be observed
(see EN 60079 or DIN VDE 0165).
Î The cable fittings must be tested for potentially explosive
atmosphere and approved with an EC-Type Examination Cer-
tificate.
Î The motor must be installed so that there is no danger of
ignition from an electrostatic charging.
Î If there is danger from an atmospheric discharge, protection
against lightning must be arranged.
Î When they are triggered, protection and monitoring devices
must disconnect the equipment from all external conductors,
and not reconnect automatically.
In addition to the requirements listed above and the instructions for
installation (see below) the following points must be observed for
installation and electrical connection of the motors:
Î The customer must arrange to protect the motor against ex-
cessive heating as a result of overload in compliance with EN
60079-14 by means of a current-dependent delayed protection
switch with current-dependent allpole triggering as per EN
60947. The protection device must be set for the highest rated
motor current (see type plate).
Î Protective equipment must be included which protects the
motor even if an outer conductor fails.
Î Current-protected motors may only be used continuously, with
unloaded and infrequent starts, which do not produce signifi-
cant heating.
Î Additional overload protection by a direct monitoring device
with temperature sensors (PTCs) may be used, if this is certi-
fied and specified on the type plate. Connect the temperature
sensors by means of foreseen additional terminals in the main
terminal box or via an additional terminal box. If a continuity
test of the temperature sensors is required, do not apply
voltages greater than 2.5 V!
Î The overload protection by means of a current-dependent
delayed triggering must be chosen so that the time delay for
triggering the motor protector is less than the safe locked-rotor
time t
E
. The time delay may be read from the characteristic
curve of the protection switch for the I
A
/I
N
ratio of the protected
motor. The ratio I
A
/I
N
may be read from the motor type-plate.
Requirements for installation
and electrical connection of the
motors