7
©2019, 2020 Regal Beloit Corporation, All Rights Reserved. MCIM2022E • Form# SB0250E
Depending on the cross-section of the line conductor, the eart
hing
conductor cross-section must be:
Line conductor
cross-section
Earth conductor
cross-section
≤ to 25mm²
Same Section
Between 25mm
2
and 50mm
2
25mm
2
> 50mm
2
≥ 50% of the section
CAUTION!
Failure to follow the below instructions on electrical
connections could result in minor or moderate injury.
• Ensure all electrical connections are solid and continuous.
• Check motor starter and overloads for correct rating and trip
setting.
• All circuit breakers, HRC fuses or protective devices
associated with the motor must be rated to suit motor running
current and starting characteristics.
• 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 the earth, especially so in the 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.
4.7 ACCESSORIES / PROVISIONS
CAUTION!
Carefully read and understand the accessory
manufacturer’s instructions, supplied with motor. Contact Regal
for additional information.
4.7.1 BRAKE MOTORS
CAUTION!
VERTICAL MOTOR PREMATURE BRAKE FAILURE
Motors with brakes that are designed for vertical applications
are equipped with springs to support the brake pressure plate.
Mounting a horizontal brake motor vertically shaft up or down
may require a pressure plate spring modification. Failure to
modify the brake for the vertical application may result in
premature brake failure that results in minor/moderate injury.
CAUTION!
BRAKE SOLENOID WIRING:
Do NOT connect the
brake solenoid to the output of a VFD. The brake solenoids must
be wired to 50/60 Hz line power.
4.7.2 SPACE HEATERS:
Motors provided with space heaters
have two leads that are brought into the conduit box or into an
auxiliary box. These leads are marked ”H1”, “H2” (”H3”, “H4” if a
second space heater is supplied). See the space heater nameplate
on motor for heater rating.
4.7.3 THERMAL PROTECTION
WARNING!
Electrical Hazard, see section 2.1 of this manual.
General Information: When thermal protection is provided, one
of the following will be stamped on the nameplate:
“Thermally protected”
This motor has built in thermal
protection. Thermal protectors open the motor circuit electrically
when the motor overheats or is overloaded. The protector cannot
be reset until the motor cools. If the protector is automatic, it
will reset itself. If the protector is manual, disconnect motor
from power supply. After protector cools (five minutes or more)
press the reset button and reapply power to the motor. In some
cases a motor is marked “Auto” and the connection diagram on
the motor will identify thermostat leads.
“With overheat protective device”
This motor is provided
with an overheat protective device that does not directly open
the motor circuit. Motors nameplated with this phrase have
thermostats (marked “P1”, “P2”), thermistors or RTD’s (marked
“R1”,”R2”). The leads to these devices are routed into the motor
conduit box or into an auxiliary box. The lead markings are
defined on the nameplate.The circuit controlled by the overheat
protection device must be limited to a maximum of 600 volts
and 360 volt-amps. See connection decal provided inside the
terminal box cover. Failure to connect these over temperature
devices (when provided) will void the warranty.
“ATEX
®
*
Zone 2 thermostats”
Thermostats are an optional
feature not required for ATEX, Zone 2 operation. Thermostats,
when utilized, are hermetically sealed.
“Resistance Temperature Detectors” (RTD)
When winding and/
or bearing RTDs are provided the RTD lead markings are defined
on the nameplate. (Normally “R1”, “R2”, “R3” etc.)
“RTD Alarm & Trip Settings”
Below tables are suggested
initial RTD alarm and trip settings. For motors found to operate
significantly below these values the settings may be reduced
accordingly.
Winding RTD – Temperature Limit (
°
C) - 40°C Ambient
Class B Temp Rise [80
°
C]
Class F Temp Rise [105
°
C]
Alarm
Trip
Alarm
Trip
120
130
145
155
Bearing RTD – Temperature Limit (°C) - 40°C Ambient
Ambient
Alarm
Trip
Up to 40
o
C
95
100
> 40
o
C
110
115
Bearings that are Heat
Stabilized to 150
o
C
130
135
*ATEX is a trademark or tradename of European Union and is not owned or under the control of Regal Beloit Corporation