Walker Magnetics IMI Smart-D Series, Operation Manual

800-WMAGNET

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3.1.7 Connecting Optional Features

SMART-D chuck controls are equipped with three optional features, Current Sensing, Part Release and 

Lockout. These features enable the chuck control to work with external equipment such as machine controls or 
a PLC. Refer to the “Operation” section 4 of this manual for using of these features.

3.1.8 Current Sensing

This control is equipped with a current sensing feature that monitors the current flowing to the chuck and 

indicates when this current has reached a predetermined value. The current sense relay is a “Form C” dry 

contact type. The connections are at J4: Pin 6 is common, Pin 7 is the N. O. contact, and Pin 8 is the N. C. 

contact. The rating of the contacts are 10 A @ 125 VAC, 5 A @ 250 VAC, and 5 A @ 30 VDC. See Figure 5 5 
for locations.

3.1.9 Part Release

The part release relay energizes and de-energizes with the chuck. It is the same type as the current sense 

relay. The connections are at J4: Pin 3 is the common, Pin 4 is the N. O., and Pin 5 is the N. C. contact. See 

Figure 5 5 for locations.

3.1.10 Lockout

A Lockout feature is supplied with this control, which prevents anyone from accidentally changing the settings 

while machining is in progress. There are two connections for lockout. The first is to supply 115 VAC to J4, 

terminals 1 and 2. The second is to sink the positive voltage at J5, terminal 8. This is done using a dry contact 

connected to terminal 8 (lockout) and terminal 13 (GND) on J5*. See Figure 5 5 for locations.

* When using lock-out, JP2 jumper must be removed.

3.1.11 Energizing the System

Inspect the conduit and wire installation. Verify that all wiring connections are correct and secure, paying 

particular attention to the ground connections. Thoroughly read the “Operating Instructions” section 4 prior to 

energizing any equipment.
Close all breakers and disconnects upstream of the chuck control. Close the door (on models equipped with 

enclosures) and put the chuck control disconnect switch in the “ON” position. When power is first applied, the 

chuck control will initialize itself in the “Release Mode”. The “Release” indicator light on the remote unit will be 
lit and the current sense relay open. The system is ready for operation. No power is applied to the chuck.

3.2 Control Mounting Guidelines

1. When any control (power section) is removed from its original enclosure or shipped without an enclosure and installed in a customer 

supplied enclosure, the following specifications must be met.
 

a. The air surrounding the panel on which the parts are located should not exceed 120° Fahrenheit.

b. The air temperature must be measured:

1) With the control in the Full holding position;
2) After the control has been in operation for 30 minutes; and

3) With the chuck holding the largest load to be used.