External Trip Input; Opto-Isolated Inputs - Baldor 18H Series Installation & Operating Manual

Section 1
General Information

External Trip Input

External or remote motor
overload protection may
be required by National
Electrical Code or equivalent
M

Opto-Isolated Inputs

Figure 3-33 Opto-Input Equivalent Circuit (Using Internal Supply)
Opto Input 1
Opto Input 2
Opto Input 3
Opto Input 4
Opto Input 5
Opto Input 6
Opto Input 7
Opto Input 8
Opto Input 9
Opto Input Common
+24VDC @ 200mA
(supply terminal 39).
Jumper terminals 39 to 40
(Factory Installed)
MN718
Terminal J1-16 is available for connection to a normally closed thermostat or overload
relay in all operating modes as shown in Figure 3-32. The thermostat or overload relay
should be a dry contact type with no power available from the contact. If the motor
thermostat or overload relay activates the control will automatically shut down and give
an External Trip fault. The optional relay (CR1) shown provides the isolation required
and the N.O. contact is closed when power is applied to the relay and the motor is cold.
Connect the External Trip Input wires to J1-16 and J1-17. Do not place these wires in the
same conduit as the motor power leads.
To activate the External Trip input, the External Trip parameter in the Level 2 Protection
Block must be set to "ON".
Figure 3-32 Motor Temperature Relay
T1 T2 T3
M M
T2 T3 G
T1
Motor Thermostat Leads
* Motor
The equivalent circuit for the nine Opto inputs is shown in Figure 3-33. The function of
each input depends on the operating mode selected. Refer to the operating mode
connection diagrams shown previously in this section.
J1
8
9
10
11
12
13
14
15
16
17
39
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40
Terminal Tightening Torque = 7 Lb-in (0.8 Nm).
Customer Provided
Source Voltage
*
CR1
*
Optional hardware. Must be ordered separately.
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Note: Add appropriately rated
protective device for AC relay
(snubber) or DC relay (diode).
J1
16
External Trip
17
Do not run these wires in
same conduit as motor
leads or AC power wiring.
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Receiving & Installation 3-9
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