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The engine interface module has its own power supply and a tacho input to measure speed. It also has four relay outputs, four digital inputs, and three analogue inputs. These I/Os are configurable.

The power supply terminals include circuit protection against load dump transients and JEM177 surge transients (rugged design).

Physical Connections

  • Supply
    • 12 or 24V DC Power supply and frame ground
  • 1 x Relay output - Configurable
    • 30 V DC, and 6 A
  • 1 x Relay output with wire break detection*- configurable
    • 30 V DC, and 6 A
  • 4 x Digital inputs – configurable (Bipolar
    • ON: -36 to -8 V DC, and 8 to 36 V DC
    • OFF: -2 to 2 V DC
    • Voltage withstand: ±36 V DC
  • 1 x Magnetic pickup with wire break detection* **
    • 3 to 70 V AC peak
    • 2 to 20,000 Hz
    • Can be useful during start-up, when the generator frequency is too low to be a reliable indication of genset speed 
  • 1 x Generator tacho output or NPN/PNP sensor **
    • 8 to 36 V DC
    • 2 to 20,000 Hz
    • Typically signal from one of the phases of the generator.
    • Can be useful during start-up, when the generator frequency is too low to be a reliable indication of genset speed 
  • 3 x Analogue current or resistance measurement inputs (RMI) – configurable
    • Current standard 0 to 20 mA, 4 to 20 mA or configurable 0 to 25 mA
    • Pt100/1000 -40 to 250 °C (-40 to 482 °F)
    • Resistance Any custom range between 0 and 2.5 kΩ
    • Digital input Dry contact with cable supervision maximum 330 Ω for ON detection

Supply voltage low alarm

  • The alarm is activated when the power supply voltage is less than the setpoint for the delay time.

Supply voltage high alarm

  • The alarm is activated when the power supply voltage exceeds the set point for the delay time

Magnetic pickup wire break

  • This alarm is for magnetic pickup wire break. If the engine is running, but there is no pulse for 2 seconds, then the controller monitors the cable. If there is no change during the alarm delay time, then the controller activates the alarm.

Auxiliary power supply voltage as an analogue output

  • You can configure an analogue output with a function for the auxiliary power supply voltage. The controller then adjusts the analogue output to reflect the operating value.
  • An analogue output with the power supply voltage may be wired to a switchboard instrument. The operator can then see if the auxiliary power supply fails.

*Note: These inputs cannot both be used at the same time.

**Note You cannot use both the MPU and Tacho input at the same time

All analogue multi-functional inputs for EIM3.1 have a common ground