Rockwell Automation 1325L DC Motors User Manual - Manual (Page 6)

6 DC Motors
Thermostat (Thermal Protector)
Important: When motors are provided with thermal protection (typically
thermostats), it is important to properly connect and apply the
devices. This will ensure that the motor is properly protected
from being operated if thermal limits are reached and/or
exceeded. The control system must be configured to reduce the
motor load and/or shut down the motor control system to allow
the motor to cool to a level within acceptable operating ranges.
If the motor is operated with the thermal protective devices
tripped (indicating an over temperature condition), the motor
insulation could be damaged and complete failure of the motor
insulation is possible. In the event of motor failure due to an
over temperature condition, Rockwell Automation requires that
motor thermal protective devices (when supplied) be
adequately monitored and incorporated into the motor control
system to maintain warranty. Failure on the part of the
individual installing this equipment to take these steps will
result in the factory warranty being voided.
Important: Motors may have one or more thermostats (leads marked P1,
P2, etc.) designed to trip before the frame reaches the
maximum allowable temperature for specific class and group.
The normally closed contacts of the thermostat must be
connected in that motor control circuit so that power to the
motor armature and field is removed immediately when the
thermostat trips. An explosion-proof tachometer mounted on
the motor will also have an internal thermostat which must be
connected to stop the drive within 30 seconds upon tripping.
Failure to connect the thermostat leads will void the motor
warranty. the rating of the thermostat contact is:
Important: Motors with an overspeed switch must have the overspeed
switch terminals properly connected in the control circuit to
remove armature power when the switch reaches the set speed.
Grounding
The user is responsible for assuring that the grounding method is in
accordance with the National Electric Code and the applicable local codes.
The ground connection should be a solid and permanent metallic
connection between the ground point, the motor terminal housing and the
motor frame. On two pole units, DC180ATZ, C180ATZ & DC210ATZ, the
ground connection is a tapped hole in the end bracket adjacent to the
conduit box.
Maximum Voltage 250V, 60 Hz
Rated Current 6.3 amps
Maximum Breaking Current 20 amps