Underspeed or Pulse Continuity Relay in Seconds

Underspeed or Pulse Continuity Relay in Seconds


Din rail mounted under-speed relay suitable for all kinds of machinery to detect loss of speed and pulse continuity. It accepts NAMUR proximity switch, PNP sensor or clean contact input signals. The period between pulses is adjustable from 0.06 to 160  secs

Foxtam Controls
  • Manufacturer: Foxtam Controls
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  • $172.64
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Din rail-mounted under-speed relays suitable for all kinds of machinery to detect loss of speed and pulse continuity. These units are useful when an output contact is required to alarm on jamming, loss of speed due to blunt cutting tools or as a "stationary" contact to allow the release of machine guards.

The operation is "time-based", an input will reset the time delay, if an input is not seen within the set time the output relay will de-energize but not latch. The period between pulses is adjustable from 0.06 to 160  secs

Therefore the unit will re-energise if a new leading edge of an input is seen. Removal of the coil voltage, failure of the sensor, or a breakage in the cable between the unit and the PLC or sensor will also cause the output relay to de-energize if in an energized state. Hence the underspeed monitor is fail-safe.

  • Power Supply: 24 VDC
  • Max Power Consumption: 11 VA
  • Repeat accuracy: ±0.5% at constant ambient, ±3% across temperature range
  • Reset time:100 ms on make
  • Inhibit time on switch on: 7 to 8 s
  • Input signal: NAMUR proximity switch, PNP sensor (max 20 mA)
  • Normally open contact (8 VDC @8 mA)
  • Max operating speed: 300 Hz (18,000 RPM)
  • Min impulse:1 ms
  • Min time between impulses:1 ms
  • Timing:0.06 to 160  secs
  • Output contacts: SPCO 10Amps/250V AC1
  • Mechanical life:30 Million ops
  • Electrical life:200K ops at max rated load
  • Operating temperature: -10 °C to+60 °C
  • Storage temperature: -10 °C to+60 °C
  • CE marked: Yes
  • In accordance with: EN61000-6-1: 2007, EN61000-6-3: 2007, EN61010-1: 2002
  • Housing material: Thermo plastic ABS (DIN7728) Extinguishable
  • Constant ambient: ±0.5% of set value
  • Cross temp range: ±3%
  • Setting accuracy: 0 to +30%
  • Response time: Better than 100 ms
  • Manufacturer's Part: YWRVL4 S/24VDC
    • SKU
    • Weight
      0.14 kg
    • Dimensions (L x W x H)
      9 x 9 x 5 cm

Faulty Goods and Warranty

Where such goods have been supplied we undertake to repair or replace them as quickly as possible.Prior to returning faulty items, please contact us with a description of the fault as one of our engineers might be able to assist you by resolving the issue over the phone.
A Warranty form must be filled out and returned with any goods.

Our standard warranty period is 12 months from the date of purchase unless stated otherwise.

Other warranty periods:

Labjack Products: 5 Years
Atop Products: 3 Years
MeanWell Products: 3 Years
Terracom Products: 3 Years

Warranty is subject to us being satisfied that a defect was caused by defective workmanship or materials and was not caused by or was not substantially contributed to by other factors beyond our control including incorrect installation, alterations or modifications of the product not recommended by the manufacturer.

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If you are dissatisfied with our goods you may return them within 14 days of the dispatch date. Contact us for an authorisation and we will refund your purchase less shipping costs and restocking fees. All returned goods MUST be in AS NEW condition including ALL PACKAGING and DOCUMENTATION / MANUALS etc.

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  • The product returned will attract a 20% restocking fee.
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  • Non standard, custom made or a specially manufactured or imported products are not returnable.
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