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The alternating current module measures the voltage and current on one side of a breaker, and the voltage on the other side. The hardware module responds when the measurements exceed the AC alarm parameters. ACM3.1 uses the AC measurements to check the synchronization before the breaker closes.

ACM3.1 provides robust frequency detection in environments with electrical noise. ACM3.1 allows extended measurement bandwidth up to 40 times the nominal frequency. ACM3.1 includes a configurable 4th current measurement.

Default: ACM3.1 measures 3-phase systems. Optional: Select split-phase (1-phase, 3-wire, for example, L1-N-L2) or single-phase (1-phase, 2-wire, for example, L1-N)

Physical connections

  • 2 × 3-phase voltage measurements (L1, L2, L3 and N)
    • 100 to 690 V AC phase-to-phase (nominal)
  • 1 × 3-phase current measurement and 4th current measurement ((L1, L2, L3 and 4th)
    • 1 or 5 A, AC (nominal)

Voltage measurement characteristics 

  • The ACM has two sets of terminals for voltage measurement. The first set of terminals measures the voltage on the busbar. The second set of terminals measures the voltage from the source. The ACM uses these measurements for logging, alarms and protective functions.

Current measurement characteristics

  • The ACM measures the current, then uses these measurements for logging, alarms and protective functions.

Power measurements

  • For power functions, the second set of voltage measurements and the current measurements from the ACM are used together.

Frequency measurements

  • Provides robust frequency detection in environments with electrical noise.