58 Electrical installation: AC input / DC input, motor and brake
Thermal switch connection
You can use the motor's thermal switch contacts (normally closed), to control a relay
connected to a digital input on connector X3. This allows the MicroFlex e190 to
respond to motor over-temperature conditions. Using the Mint WorkBench Digital I/O
tool, the input can be configured to be the motor temperature input. The Mint keyword
MOTORTEMPERATUREINPUT can also be used to configure a digital input for this
purpose. A typical circuit, using DI2 as the input, is shown in the following diagram:
+24 V 0 V+24 V 0 V
14
4
X3
DI2+
DI2-
The relay has normally open
contacts and is shown deactivated
(contacts open, motor overheated).
motor
thermal
switch
Separate
customer
supplied
24 V DC supply
Customer
supplied
24 V DC
supply
WARNING! The 24 V DC power supply connected to the thermal switch must
be a separate supply as shown in the diagram. The thermal switch wires often
carry noise that could cause erratic drive operation or damage. The thermal switch
contacts must never be wired directly to a digital input. The separate 24 V DC supply
used for the thermal switch can also be used for the motor brake circuit.
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