Stagehand Apprentice 2: Interlock Inputs
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1
+24VDC
2
Forward Interlock Input
3
Reverse Interlock Input
4
External Fault
5
All-stop Interlock Input
6
0VDC (COM)
7
No connection
8
Ground (Earth)
The Interlock Connector provides four (4) sensor inputs that can interrupt motion to avoid collisions.
Two machines may present a hazard on stage when they obstruct each other's path. The interlock inputs allow the Stagehand to sense an external obstruction and abort motion if the path is not clear. Interlock faults are shown on the Stagehand Display, and within the Spikemark software, to easily identify the culprit when motion stops unexpectedly.
Switches wired into the Interlock Connector are often wired Normally Open (N.O.) leaving the circuit open until the switch is activated by a scenic element moving into a safe position.
The Interlock Terminator ships with the Stagehand Apprentice 2 and should be plugged into the Interlock Connector whenever the Interlock Inputs are not being used. It can also be installed temporarily to defeat an Interlock Fault to drive the machine clear of an obstruction, provided it is safe to do so.
Forward movement is interrupted unless +24VDC is sensed on pin #2 of the Interlock Connector. If motion is interrupted, either clear the obstruction or temporarily override the interlock signal by plugging in the Interlock Terminator that was shipped with the Stagehand Pro 5.
Reverse movement is interrupted unless +24VDC is sensed on pin #3 of the Interlock Connector. If motion is interrupted, either clear the obstruction or temporarily override the interlock signal by plugging in the Interlock Terminator that was shipped with the Stagehand Pro 5.
Both forward and reverse movement are interrupted unless +24VDC is sensed on pin #5 of the Interlock Connector. If motion is interrupted, either clear the obstruction or temporarily override the interlock signal by plugging in the Interlock Terminator that was shipped with the Stagehand Pro 5.
The Interlock Connector can also be used in conjunction with a Safety Interlock Box - Pro 4 to monitor 4-wire safety sensors such as or . Both types of sensors can improve the safe operation of stage lifts.
The Forward Interlock can be used much like a , but rather than limiting forward motion based on the position of the machine powered by the Stagehand, the Forward Interlock senses the position of another machine or scenic element.
The Reverse Interlock can be used much like a , but rather than limiting reverse motion based on the position of the machine powered by the Stagehand, the Reverse Interlock senses the position of another machine or scenic element.
Both forward and reverse motion will be interrupted unless pin #4 & pin #1 are connected on the Interlock Connector. This signal indicates that there is an electrical fault outside of the Stagehand preventing motion. The intention is to detect when a thermal overload relay has tripped on a single motor, when multiple motors are being powered by one Stagehand (e.g. a turntable being spun with multiple machines).