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3.5.5 Thermal switch connection
You might wish to wire the motor’s thermal switch contacts (normally closed), using a relay, to a digital input on connector X3 (see section 3.3.1). Using the Mint WorkBench Digital I/O tool, the input can be configured to be the motor trip input. This allows the MicroFlex e100 to respond to motor
| A |
motor |
|
thermal |
|
switch | B |
|
+24VDC |
| 0V | |
| |||
|
|
|
|
Separate customer supplied 24VDC supply
‘X3’
DIN1+ 16
Relay
DIN1- | 6 |
|
+24VDC | 0V |
Customer supplied 24VDC supply
Figure 9 - Motor thermal switch circuit
CAUTION: The 24VDC power supply connected to the thermal switch must be a separate supply as shown in Figure 9. Do not use the 24V supply used for the drive enable signal, or the internally generated supply (if present). 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 24VDC supply used for the thermal switch may also be used for the motor brake circuit (section 3.5.6).
MN1942 | Basic Installation |