www.supportme.net

BasicInstallation 3-21MN1942

3.5.5 Thermalswitch connect ion
Youmight wish to wire the motor’s thermalswitc h contacts (normally c losed), using a relay, to a
digitalinput on connec tor X3 (see section 3.3.1). Using the Mint WorkBench Digital I/O tool, the
inputcan be c onfigured to be the motor trip input. This allows the MicroFlex e100 to res pond to
motorover-temperature c onditions. The Mint keyword MOTORTEMPERATUREINPUT can also be
usedto configure a digital input for t his purpose. Atypical circ uit, using DIN1 as theinput,is shown
inFigure 9.
A
B
motor
thermal
switch
Relay
Customer
supplied
24VDC
supply
+24VDC 0V
Separate
customer
supplied
24VDCsupply
+24VDC 0V
DIN1+
DIN1-
16
6
‘X3’
Figure9 - Motor thermal switch cir cuit
CAUTION: The 24VDC power supply connected to the thermal switch must be a
separates upply as shown in Figure 9. Do not use the 24V supply us ed for
thedr ive enables ignal, or the internally generated supply (if present). The
thermal switch wires often carry nois e that could cause erratic drive
operation or damage. The thermal switch contacts must nev er be wired
directly to a digital input.
Thesepar ate24VD C supply used for the thermal switch may also be used
forthe motor brakecircuit (section3.5.6).