Rockwell Automation Publication 20P-TG003B-EN-P - September 2021
39
Component Test Procedures
Chapter 2
Thermistors and Thermal
Switches
Motor overheating is detected by an external, user-supplied themistor (PTC) or
thermal switch connected to terminals 78 and 79 on the control power terminal
block on the lower, right corner of the pulse transformer circuit board. See
for terminal block location.
Motor overheating is typically identified by a “Motor Over Temp” fault (F16).
See “Fault Descriptions” in Chapter 4 of the PowerFlex Digital DC Drive User
Manual, publication
for a
circuit diagram.
•
If a thermal switch is used, a 1 k
resistor must be placed in series between
the switch and either terminal 78 or 79.
•
If neither a thermistor (PTC) or a thermal switch is installed, a 1 k
resistor must be connected between terminals 78 and 79.
The drive heatsink temperature is monitored by a bimetal thermostat connected
directly to the heatsink. When the heatsink temperature is too high, a “Heatsink
OvrTemp” fault (F8) occurs. See “Fault Descriptions” in Chapter 4 of the
PowerFlex Digital DC Drive User Manual, publication
for details.
for a circuit diagram.
During normal operation, 1.6V DC is present between terminal 78 and drive
common. When an open circuit exists between terminals 78 and 79, 24V DC
will be present at terminal 78 to drive common. If the 24V is missing, the pulse
transformer board may need replacement.
Relay Outputs
Terminals 35 and 36 and 75 and 76 are N.O. relay outputs. The relay output
between terminals 35 and 36 is configured with parameter 1392 [Relay Out 1
Sel]. The relay output between terminals 75 and 76 is configured with parameter
629 [Relay Out 2 Sel]. See “Using Contactors” in Chapter 1 of the PowerFlex
Digital DC Drive User Manual, publication
, for more information.
The “Main Contactor” fault (F10) indicates a problems related to a contactor
used with the drive. See “Fault Descriptions” in Chapter 4 of the PowerFlex
Digital DC Drive User Manual, publication
for details.
Содержание Allen-Bradley PowerFlex 4M
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