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©2020 Regal Beloit Corporation, All Rights Reserved. MCIM20001E • Form# SB0098E
Specific conditions of use for Hazardous Area Motor:
• WARNING!
The equipment may present a potential
electrostatic charging hazard: the user instructions shall
be followed in order to minimize the risk of electrostatic
discharge.
• For arrangements that include a separately motor driven
cooling fan, these shall be tested to verify that the rating
of the cooling fan motor is not exceeded.
• The thermal protection devices, when fitted with the
motors with Variable Voltage Variable Frequency (VVVF)
drives, shall be connected into motor control circuit in
such a manner as to disconnect the source of supply in
order to prevent the nominated temperature class from
being exceeded.
• The stator Resistance Temperature Detector (RTD) and
thermistors can be connected vis standard industrial
controller provided that the controller is located in a
safe area.
• The plug and socket type DXN1 shall not be used on
inverter driven motors above 50/60Hz.
• The plug and socket type DXN1 are limited to use within
low impact areas.
7.0 CABLE ENTRIES
Cable entries are via appropriate cable glands or conduits
fitted to the threaded entries in the wall of the terminal box
or the gland plate attached to it. Cable entries for various
frame sizes are as per the following table.
Motor
frame
No. of
entries
Entry size
x pitch
Reference drawing
for Ex motors
80 - 100
M20 x 1.5 or
M25 x 1.5
B - PPA149
112 - 132
1 or 2
M20 x 1.5 or
M25 x 1.5
B - PPA125 &
B - PPA126A
B - PPA132A
160 - 200
1 or 2
M25 x 1.5 or
M32 x 1.5 or
M40 x 1.5 or
M50 x 1.5
B - PPA125,
B - PPA127 &
B - PPA133
225 - 315
1 or 2
M40 x 1.5 or
M50 x 1.5 or
M63 x 1.5
B - PPA125,
B - PPA129A,
B - PPA130A,
B - PPA130B,
B - PPA130C,
B - PPA134 &
B - PPA135
*355 - 400 1 or 2
B - PPA125 &
B - PPA131
*355 and 400 frames are supplied with a blank gland plate for the
customer to create gland entry holes as appropriate.
Cable glands used by installer on hazardous location
motors must be of IEC Ex certified type as appropriate to
the installation requirements. Unused cable entries must
be blanked off by installer using IEC Ex certified conduit
stops as appropriate.
Cable glands and conduit stops must be of an IP Rating
equal to or better than that of main motor as marked on
the nameplate.
Vibration sensors and shaft encoders when fitted by the
installer are to be appropriately certified by IECEx or ATEX
for Zone 1 Group II T3 for Ex e, Zone 2 Group II T3 for
Ex nA or Zone21 T135oC for Ex t.
7.1 SUPPLY CABLE/ TERMINALS
Supply terminals are located in the terminal box. They are
suitable for receiving crimped lugs on the supply cables. In
addition the terminal box also houses an earthing terminal.
Motor frame
Terminal Size
80 – 132
M5
160 – 200
M8
225 – 280
M10
315 - 400
M12
8.0 ELECTRICAL CONNECTION
• WARNING!
Ensure all electrical connections are solid
and continuous.
• WARNING!
All circuit breakers, High Rupturing Capacity
(HRC) fuses or protective devices associated with the
motor must be rated to suit motor running current and
starting chatracteristics.
• WARNING!
Ensure that proper earthing connection is
made with all washers as provided.
• WARNING!
Check that the cable glands used on
hazardous location motors are Ex approved by the
standards organisation. Gland plugs to be of approved type.
• Check motor starter and overloads for correct rating and
trip setting.
• Supply cables must be appropriately selected considering
the voltage drop.
• When using long supply cables with VVVF drive, check
with Regal for proper recommendations to avoid high
voltage transients occurring at motor terminals.
• Check the connection diagram on the motor terminal box
and make sure the supply leads are properly connected
considering the supply phase sequence.
• Ensure that the supply cable termination on to the motor
terminal board is firm, without loss of strands while using
crimped lugs and all washers are used in the correct
order as provided.
• Ensure enough clearances are provided between supply
cable lugs and to earth especially so in case of hazardous
location motors.
• If using conduit for the supply leads, ensure the
conduit is completely threaded in and seal the threads
appropriately.
• If RTDs of hazardous location motors are connected to
monitor the winding temperature, the maximum voltage
to the RTDs must be kept to 90V(peak) or below.
• The thermal protection devices shall be connected
into the motor control circuit in such a manner as to
disconnect the source of supply in order to prevent the
nominated temperature class from being exceeded. The
stator RTDs and thermistors can be connected via a
standard industrial controller provided that the controller
is located in a safe area.
