PowerFlex Digital DC Drive User Manual -
Publication 20P-UM001C-EN-P - July 2008
1-26
Installation and Wiring
between terminals 78 and 79 (installed at the factory). Follow the
appropriate instructions below when installing a thermal sensor.
Thermistors (PTC)
PTC thermistors fitted in the motor can be connected directly to the drive
via terminals 78 and 79. In this case the 1k ohm 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 motor 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 in order to indicate a drive “Motor Over Temp” fault (F16),
though this is not recommended due to the noise sensitivity of the current
threshold circuitry. If a thermal switch is used a 1k ohm resistor must be
placed in series between the switch and one of the terminals.
Table 1.H Relay Outputs and Thermistor/Thermal Switch Wire Sizes and
Specifications
Figure 1.20 Frame A Relay and Thermistor/Thermal Switch Terminal Block Locations
Signal Type
Terminals
Wire Size and Type
(1)
(1)
Cable and Wiring Recommendations on page 1-14
for more information.
Tightening
Torque
N
•
m (lb
•
in)
Flexible
(mm
2
)
Multi-core
(mm
2
)
AWG
Relay Outputs
35 & 36, 75 & 76
0.140 - 1.500 0.140 - 1.500 26-14
0.5 (4.4)
Thermistor and
Thermal Switches
78 & 79
78 79 35 36 75 76
Note: Terminals 78 and 79
shown with 1k ohm resistor in
place of temperature sensor.
