PCM177 - Pilot Cable Monitor

Product Diagram

The PCM177 pilot cable monitor is an earth continuity relay. It provides earth continuity protection in accordance with AS/NZS 2081 ensuring the earth connection through a trailing/reeling cable is maintained. A pilot cable is connected to earth via a diode, the PCM177 detects open and short circuits between the pilot and earth conductors of the trailing cables. The unit has filtering to remove unwanted inductively or capacitive coupled ac signals. The LEDs indicate power to the unit and the status of the pilot cable ('HEALTHY' LED). There are two changeover contacts rated at 8A/250V which are fail-safe. Output contacts de-energise (unHEALTHY) on conditions of:

  • Loss of power
  • Open circuit of pilot cable
  • Loop resistance exceeds set value.
  • Pilot cable shorted to earth.
  • Leakage resistance to earth is less than 600Ω

There are two basic operating models;

  1. Local or automatic reset models go into a HEALTHY condition when no fail conditions exist. A stop button can be wired in series with the pilot cable to de-energize relay if necessary. In local mode, the PCM177 will automatically reset after the fault has been cleared.
  2. Remote start or latching models have a remote 100Ω series resistor connected across a remotely mounted normally open start button. When start is pressed the PCM177 checks loop resistance before switching to a HEALTHY condition. The PCM177 will go into an unHEALTHY state if the start button is held or stuck for longer than 15 seconds. In latching mode, a manual reset (press start button) is needed after the fault has been cleared.

Attachments

 
 

Most drawings are supplied in PDF format. Portable Document Format is used to present documents in a manner independent of application software, hardware, and operating systems.

 

Lead Time for a Premier Product

 

Premier products represent the best value for the selected function and have faster delivery times, typically 4 days.

Stock Variants

 
Stock variants usually ship in 1 day.
 
PCM177-14000
Power Supply 240Vac 50/60Hz (240Vdc)
Operating Mode Local 45 ohm pilot
PCM177-24000
Power Supply 110Vac 50/60Hz (110Vdc)
Operating Mode Local 45 ohm pilot
PCM177-34000
Power Supply 24Vac 50/60Hz (24Vdc)
Operating Mode Local 45 ohm pilot

Alternate Products

 
 

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Order Processing

 
Information

APCS makes and customises products according to a customers order. Upon receipt of the customers order the following information is required before manufacture, allocation or deliver until full details are given, these include;

  1. Identity of purchaser. Company name, ABN (Australian companies), street address and accounts email address.
  2. Required delivery address.
  3. Full part number and calibration detail required to manufacture items.
  4. Total on purchase order to include delivery charges. Orders received with missing information will be entered and marked to indicate missing details and returned to the customer for correction or approval.

Compliance with the above ensures that your items are manufactured and delivered according to the required specifications.

Standard delivery times commence after the order has been approved for processing.