
Rockwell Automation Publication 20P-TD001K-EN-P - January 2021
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PowerFlex DC Drive and Field Controller Technical Data
PowerFlex DC Drives and Field Controller 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
the PowerFlex Digital DC Drive User Manual, publication
, for more information.
PowerFlex DC Drives and Field Controller Thermistors and Thermal Switches
To detect motor overheating and protect the load from overloading, an external, user-supplied thermistor (PTC) or thermal switch must be
connected to terminals 78 and 79. The response of the drive to a load over temperature fault is configured in parameter 365 [OverTemp Flt
Cfg]. If a temperature sensor is not used, a 1 k
Ω
resistor must be connected between terminals 78 and 79 (installed at the factory). The
instructions for installing a thermal sensor are detailed here.
Thermistors (PTC)
PTC thermistors that are fitted in the load can be connected directly to the drive via terminals 78 and 79. In this case, the 1 k
Ω
resistor is not
required between terminals 78 and 79.
Thermal Switches (Klixon) in the Motor Windings
Klixon type temperature-dependent contacts can disconnect the drive from the load via an external control or can be configured as an
external fault using a digital input on drive. They can also be connected to terminals 78 and 79 to indicate the following:
• For a PowerFlex DC drive, to indicate a drive “Motor Over Temp” fault (F16)
• For a PowerFlex DC field controller, to indicate a field controller “PTC Over Temp” fault (F16)
However, this configuration is not recommended due to the noise sensitivity of the current threshold circuitry. If a thermal switch is used, a
1 k
Ω
resistor must be placed in series between the switch and one of the terminals.
Frames A and B Contact Relay and Thermistor Terminal Block Locations
Contact Relay and Thermistor Terminal Designations
Terminal
Description
35
N.O. contact. Configured with parameter 1392 [Relay Out 1 Sel] - set to 25 “Contactor” by default.
36
75
N.O. contact. Configured with parameter 629 [Relay Out 2 Sel] - set to 5 “Ready” by default.
76
78
Motor thermistor connections (PTC)
79
Note: Terminals 78 and 79
shown with 1k ohm resistor in
place of temperature sensor.
Frame A
Frame B