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When power is applied, the power LED comes on. When a motor start signal is applied to pin 3, the middle LED comes on, showing that the 500 VDC is being applied to the motor winding. If the winding is good, the Automeg completes the megging operation, and the motor starts signal is then connected from pin 3 to 4.

If the winding is bad, the Low Meg LED comes on, and the motor start signal will not be available at pin 4 to engage the motor starter. To unlatch the Low Meg alarm contact, depress the Motor Reset pushbutton. The Low Meg Alarm contacts, pins 10 and 11, are a normally open relay contact that closes upon the Low Meg Alarm condition.

An Emergency Bypass Switch is provided to bypass the megging process. Placing this switch in the bypass mode disables the megging circuit, and engages the motor start relay circuit, pins 3 and 4.

The Meg Test Button is used to verify that the Automeg unit will provide an indication for a Low Meg condition should the condition occur.

The Meg test is used to check the low Meg condition when there is no start signal applied. If the start signal is present, the Meg test circuitry is disable.
Unit of Measure

Specifications

Alternating Current (AC) Input Voltage

 N/A 120 V

Frequency

 N/A 50 to 60 Hz

Current

 N/A 5.9 V·A

Power on Pins

 N/A 1 2

Internal Direct Current (DC) Voltage

 N/A 500 V

Normal Relay Contact Rating

 N/A 3 A

Inrush Relay Contact Rating

 N/A 30 A

Pilot Duty Relay Contact Rating

 N/A 360 V·A

Single-Pole Single-Throw (SPST) Motor Run Relay Power on Pins

 N/A 3 4

Single-Pole Single-Throw (SPST) Low Meg Alarm Relay Power on Pins

 N/A 10 11

Operating Temperature

 N/A -20 to 60 ºC

Storage Temperature

 N/A -45 to 85 ºC

Case Material

 N/A Polycarbonate

Base Material

 N/A Rhynite

Underwriter's Laboratories (UL) File Number

 N/A #E138380

Quality Mark Issued by Underwriters Laboratories

 N/A Recognized Component Mark

Typical Applications

Typical Applications

 N/A Electric Motor Insulation Monitor

Notes

Notes

 N/A
  1. A 1 Amp fuse is required at Pin 9 to protect the leakage circuit.
  2. Use an isolation contactor when using Automeg with Soft Starts and VFD's.
  3. Periodically depress the Meg Test pushbutton to ensure that the unit displays the Low Meg LED indication.
  4. Periodically check that the Emergency Bypass Switch is not in the Bypass position.
Made in the U.S.A.
Automeg units require the use of an SD12-PC socket.