Stagehand Pro 5: Sensor Input
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The 24-pin Sensor Input receptacle includes signal inputs for the following sensors:
(to prevent overtravel of a machine)
(to halt a winch or hoist if cable is winding improperly)
(to detect the weight being lifted by a machine)
Limit signals are designed as fail-safe inputs. To allow movement in the corresponding direction, an electrical signal must be present. If the signal is interrupted, motion will stop. Limit switches should be wired Normally-Closed (N.C.) for failsafe operation.
1
+24VDC
2
Ultimate Limit Signal
3
+24VDC
4
Reverse Limit Signal
5
+24VDC
6
Forward Limit Signal
The Ultimate Limit signal is used as a redundant signal to halt motion if an initial Forward or Reverse Limit Switch failed to stop the machine. There is a single Ultimate Limit Signal on the Stagehand Pro 5. To protect both directions of travel, a pair of physical switches can be wired in series.
Ultimate Limit switches should be physically positioned to trigger after the initial Forward and Reverse Limit switches.
If an Ultimate Limit is activated, the Stagehand will disallow any further movement in either direction until the limit is physically cleared or the Ultimate Limit Override Button is pressed. An Ultimate Limit activation indicates a failure of an initial limit switch and must be investigated. You cannot recover from an Ultimate Limit activation by running a cue.
A Normally-Closed (N.C.) switch can be wired into the Reverse Limit input. If the limit switch is activated, the Stagehand will not allow further motion in the reverse direction until the limit is cleared by any of the following means:
moving in the forward direction far enough to clear the limit switch
adjusting the switch mechanically
pressing the Reverse Limit Override Button if it is safe to do so
A Normally-Closed (N.C.) switch can be wired into the Forward Limit input. If the limit switch is activated, the Stagehand will not allow further motion in the forward direction until the limit is cleared by any of the following means:
moving in the reverse direction far enough to clear the limit switch
adjusting the switch mechanically
pressing the Forward Limit Override Button if it is safe to do so.
1
24VDC
3
24VDC
5
24VDC
9
Cross Groove Input
11
24VDC
The Cross Groove (X-Groove) Detection will halt all motion unless +24VDC is supplied to input pin #9. Most commonly, this signal is used on a winch or hoist to stop motion when the wire rope jumps a groove because of pulley misalignment.
To clear the Cross Groove Fault, press the Sensor Override Button and jog the machine in the opposite direction until there is no longer a cross groove.
Not every machine needs Cross Groove Detection. If your machine does not utilize Cross Groove Detection, you must jump input #9 with a +24VDC source pin to enable motion.
10
Load Cell Signal - Analog Input (4-20mA)
11
+24VDC
12
COM (0VDC)
The Load Cell Input is an analog signal to read the weight being lifted, or force exerted, by a machine. The load cell can be powered by Pins #11 & #12. Pin #10 will read a 4-20mA analog signal from the load cell. The 4-20mA signal can be scaled in Spikemark to display accurate load readings.
In addition to displaying the load, the Stagehand can be configured to halt when either the load exceeds a maximum value (Overweight Fault) or drops below a minimum value (Underweight Fault).
To clear a Load Cell Fault either:
Reduce the load (overweight)
Clear the obstruction (underweight)
Push the Sensor Override button and manually jog the motor
13
Speed Encoder - A
14
Speed Encoder - /A
15
Speed Encoder - B
16
Speed Encoder - /B
17
+5VDC
18
COM (0VDC)
19
Position Encoder - A
20
Position Encoder - /A
21
Position Encoder - B
22
Position Encoder - /B
23
+5VDC
24
COM (0VDC)
GND
Shield
Stagehand Pro 5 utilizes two encoder signals. One for monitoring speed and one for positioning.
Encoder requirements:
5 VDC
Incremental quadrature encoder signal
Differential line drivers: A, /A, B, /B
The Speed Encoder should be directly connected to the motor. It provides feedback to the Variable Frequency Drive (VFD) to monitor overspeed faults. It also provides precise speed regulation which enables full-torque at zero-speed. This signal is used by the VFD to verify the speed of the machine closely matches the commanded speed whether running cues, or jogging manually.
The speed encoder signal is used solely by the VFD for closed-loop vector speed control. If the VFD is switched to a sensorless speed control mode, the speed encoder signal is not used.
The Position Encoder provides feedback to the Stagehand Card to track the position of the machine or scenery. It is actively used to run cues, and it is constantly monitored to track the position of the machinery or scenery at all times. However, it is not actively used during manual operation (aka jogging). This allows for manual operation in case of a position encoder failure.
