Rockwell Automation 1397 DC Drive Firmware 2.xx - Manual (Page 100)

4–28 Start–Up and Adjustment
Publication 1397-5.0 — June, 2001
5. Motor Thermostat Input – If your DC Motor is equipped with a
thermostat verify that it is correctly wired. Remove power from
the Drive and verify that no voltage exists between either motor
thermostat input terminal and ground by measuring between both
terminal 13 and 14 and the Drive chassis. If voltage exists,
verify motor thermostat wiring at the motor.
NOTE: If the DC motor used for this application doesn’t
possess a motor thermostat, verify that terminals 13 and 14 of
the regulator board terminal strip are jumpered (Figure 4.11) and
proceed to Step 6.
Regulator Board Terminal Strip
24VDC Thermostat Circuit
12
13
14
BRUSH WEAR
MOTOR THERMOSTAT
+24V
Jumper here for
non–thermostat use
Figure 4.11
No-Thermostat Option
!
ATTENTION: It is strongly recommended that a
motor thermostat be used to protect the motor from
overheating. Failure to use a thermostat or wire it
properly could result in motor failure if the motor is
run at excessive load for prolonged periods.
Temporarily remove the wire terminated at thermostat input
terminal 14 of the regulator board terminal strip. With an ohm
meter, measure the resistance between terminal 13 and the
lead removed from terminal 14. If the measured resistance isn’t
between 0 and 2 ohms, verify the motor thermostat wiring at the
motor.
At the motor, temporarily remove one of the motor thermostat
connections and perform the resistance measurement performed
above. If a very high resistance is not measured (i.e. infinity,
“OL”, etc.) verify the motor thermostat wiring.
If resistance measurements are correct, reconnect the thermostat
wiring at both the Motor and Drive.
6. Brush Wear Input – Some DC Motors are equipped with a
brush wear switch which is designed to open when the carbon
brushes become excessively worn. The brush wear switch is
an alarm signal indicating brush wear maintenance is required.