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3-18 Basic Installation
MN1901
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 4.3.1). Using the Mint WorkBench Digital I/O tool,
the input can be configured to be the motor trip input. This allows the MintDrive
II
to respond to
motor over-temperature conditions. The Mint keyword
MOTORTEMPERATUREINPUT
can also
be used to configure a digital input for this purpose. A typical circuit, using DIN1 as the input,
is shown in Figure 9.
A
B
motor
thermal
switch
CREF
X3
7
DIN0 (
INX.0
)
Relay
Customer
supplied
24VDC
supply
+24VDC
0V
10
11
12
13
14
15
16
17
DIN1 (
INX.1
)
DIN3 (
INX.3
)
DIN7 (
INX.7
)
DIN5 (
INX.5
)
DIN4 (
INX.4
)
DIN2 (
INX.2
)
DIN6 (
INX.6
)
Separate
customer
supplied
24VDC supply
+24VDC
0V
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).
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