VACUUBRAND MZ 2C EX +IK+EK - Manual (Page 66)

page 66 of 75
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. manual-no.: 999128 / 29/04/2014
ELNOR MOTORS NV
12/12/08 INSTRUCTIONS MANUAL 3 / 5
Note: If a spare opening for a cable gland isn't used, only the use of a certified explosion proof
plug retains the explosion proof characteristics.
Particular attention is to be given to the fixing torque of bolts and screws. The motor fixing bolts
are factory mounted with the correct torque and should not be touched.
It may be necessary to open the terminal box for connecting the motor. When re-mounting the
cover, only use the original screws.
IMPORTANT: Firstly tighten all screws by hand before applying the full torque. Then tighten the
screws until the spring ring is flat.
Using a pulley or a coupling device:
Apply only well balanced discs and couplings. Check the alignment after assembling
Take care while mounting of the pulley on the shaft: Hammering on the shaft will damage the
motor bearings. Pulleys should only be mounted with appropriate mounting tools that do not
stress the motor bearings.
Following these recommendations will greatly increase the expected motor bearing life.
Safety regulations in respect of guarding couplings and belts from being accidentally touched
must be applied.
Use of a frequency converter:
In areas with an explosion risk, the use of the motor over a frequency converter is limited.
The frequency converter must in such case be placed outside the explosion-endangered area. If
the frequency converter needs to be placed inside the explosion-endangered area, the
additional requirements for such an installation must be respected.
It should be verified that the functioning of the motor is not influenced in a way that the
requirements for Ex-environments are no longer satisfied.
MOTOR PROTECTION
If the motor is equipped with an automatic reset thermal protection, the motor will in case of
thermal cutout restart automatically and without warning after a certain cooling period. Contact
the manufacturer if you need more information on the type of protection that is used.
If the motor is supplied with a thermal protection that is brought out separately, the user must
connect the protection in a way that the motor is switched off when the protector switches.
MAINTENANCE
The maintenance of the motor can be limited to periodic inspection of the ventilation circuit, to
keep it conveniently unobstructed, and to the replacement of the bearings; this period depends
on the working conditions and ambient. Re-greasing is not necessary, the ball bearing are
lubricated for life. In the presence of dust, the motor needs to be cleaned on a regular basis.
In the case of DC motors with brushes in continuous contact with the slip rings, the slip rings,
the brushes and the brush-holders should be periodically cleaned by vacuum cleaning.
REPAIR
The explosion proof motor must not be opened while the motor is energised.
Qualified persons only may do repair or service of the motor. If the customer himself carries out
the operation, he must observe the valid standards. If a repairer treats the motor, he has to
hand a certificate of conformity to the user.
The manufacturer is not responsible for motors that are modified or opened without his written
agreement.