The M100 Stopswitch is a simple inductive proximity shaft speed monitoring device designed to detect stopped motion. It is a self-contained unit that includes a single set point, which signals when the shaft has stopped rotating. This device is used for process control, motion detection, and stopped shaft indication.
Function Description:
The M100 Stopswitch operates by detecting the presence of a metallic target. An inductive sensing device located in the nose of the M100 enclosure will detect a metal target. This target can be an existing belt head or device attached to a shaft. The M100 Stopswitch requires no calibration and provides an output when the shaft has stopped rotating. Ideally, the target should be a ferrous metal, but non-ferrous metal will be detected at a shorter range. The maximum range for ferrous targets is 5/16 inch (8 mm), and for non-ferrous targets it is 3/16 inch (5 mm), assuming a 3/4 inch (19 mm) diameter target. Smaller targets may be used, but operating distances will be reduced. The unit incorporates a start-up delay of 4 seconds to allow moving parts to achieve correct speed. Thereafter, if a pulse is not received within 4 seconds, an output stopped motion signal is indicated.
Important Technical Specifications:
- Supply: 24 to 240 Volts AC/DC (50/60 Hz)
- Switching Capacity: 200 mA Maximum
- Saturation Voltage: 8 Volts Maximum (Output On)
- Leakage Current: 1.6 mA Maximum (Output Off)
- Operating Temperature: -13°F (-25°C) to +158°F (+70°C)
- Relative Humidity: 90% RH
- Sensing Range: Ferrous Target - 5/16 Inch (8 mm) Maximum; Non-Ferrous Target - 3/16 Inch (5 mm) Maximum
- Enclosure: Nylon - ISO Threaded 18 mm by 1 mm Pitch
- Cable: 6 ft. (2 m), 2 Conductor
- Output State: Normally Closed (Volt Drop 8 Volts Max.) Above Minimum Input Speed; Normally Open (Leakage Current 1.6 mA Max.) at Stopped Motion
- Input Pulse Range: 20 to 2,000 PPM Maximum
- Start Up Delay: 4 Seconds
- Trip Point: Stopped Motion if No Input Received for a Period of 4 Seconds
- LED Indicators (2): Red (Input) = Target Sensed; Green (Output) = Closed Circuit
- Protection: IP67
- Approvals: CSA Class II Division 1 Groups E, F and G (USA & Canada); ATEX & CE Versions Available (Europe)
Dimensions:
The M100 Stopswitch has a length of 3-1/8 inches and a width of 2-1/4 inches. The cable length is 6 ft. (2 m) with 2 x 20 AWG Conductors. The sensor has 18 mm by 1 mm pitch ISO threading.
Usage Features:
- Installation: The M100 Stopswitch should be fastened to a suitable mounting bracket with a guard, such as 4B's Whirligig® universal shaft sensor mount. The nose of the switch should be within the sensing range of the target, as shown in the installation diagrams. For belt slip applications, it is crucial not to use the M100 Stopswitch.
- Wiring: All wiring must be in accordance with local and national electrical codes and should be undertaken by an experienced and qualified electrician. All wiring methods must be suitable for Class II Division 1 (Groups E,F,G) Hazardous Locations. Always use dust/liquid tight flexible metal conduit with approved fittings to protect the sensor cables. Use rigid metal conduit to protect the cables from the sensors to the control unit. Conduit systems can channel water due to ingress and condensation directly to sensors and sensor connections which over time will adversely affect the performance of the system. As such, the installation of low point conduit drains is recommended for all sensors. The M100 has a two-wire cable. It must be wired through a load (see below) with the same voltage rating as the supply being used. The supply polarity to the M100 is not important and the load can be connected to either wire. The cable can be extended to virtually any length with ordinary 2 wire cable. Do not wire the M100 directly to a motor starting coil due to the 200 mA maximum current capacity. It is not recommended to wire the M100 in series with other sensors.
- Testing and Commissioning:
- Check that the unit is correctly installed (see standard wiring diagram).
- Check that the distance between the target, stud or bolt head and sensing face of M100 Stopswitch is within the minimum distance specified.
- Start the machine.
- The unit is now set. If the M100 Stopswitch fails to receive a signal within every 4 second period, (i.e. target stops rotating or there is a power failure) the unit will switch to normally open.
- Test by sliding a metal putty knife between the sensor and the target.
- During normal operation the red LED will flash each time an input signal is received. The closed circuit is indicated by a permanent green LED. If the unit fails to receive a signal for 4 seconds the circuit reverts to open state indicated by the green LED going out.
- LED Indicators: The M100 Stopswitch features two LED indicators: a red LED for target sensed (input) and a green LED for closed circuit (output). The red LED flashes each time an input signal is received, and the green LED is permanently on when the circuit is closed. If the unit fails to receive a signal for 4 seconds, the green LED will go out.
Maintenance Features:
- Regular Maintenance and Inspection: A proper maintenance and inspection program should be developed to determine the appropriate frequency for inspection. Many different factors, such as weather conditions, construction work, insect infestation, and the real-world experience of knowing how your employees perform their jobs, can influence this frequency. Personnel should be trained and qualified to perform these important functions. Complete and accurate records of the maintenance and inspection process should be created and retained.
- Troubleshooting Guide:
- Red LED (input) does not illuminate: Check that the load and the supply voltage are the same, and that the total circuit current is less than 200 mA. Slide a screwdriver blade across the face of the sensor; the input LED should flicker. If not, contact 4B.
- If the input LED does flicker, move the front face of the sensor closer to the target and check the target size as specified under "INSTALLATION".
- Red LED (input) Stays on Permanently: Either increase the gap between the target and the shaft, or between the target and the sensor face.
- Safety Precautions:
- Rotating parts can crush, cut, and entangle. Do NOT operate with guard removed. Lockout power before removing guard or servicing.
- Explosion hazard. Do not remove or replace while circuit is live unless the area is free of ignitable concentrations.
- If the system does not immediately shutdown as expected or alarm as required, remove the machine from service until the problem has been diagnosed and corrected.
- O.S.H.A. requires that all exposed rotating shafts are provided with a full guard. Therefore, this device and its target must be equipped with a guard.
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