GE 3720 ACM Three-Phase Digital Meter

The GE 3720 ACM, also cataloged as the 3720 ACM Three-Phase Digital Meter, operates as a dedicated hardware component for three-phase voltage, current, power, and cumulative energy parameter acquisition within industrial power monitoring networks.

Hardware Specifications

Backplane Bus Communication and Firmic Determinism

• Backplane Bus Communication Velocity Licences: Executes deterministic real-time power metrics calculation (kW, kVAR, kVA) and streams digitized load profile data over standard industrial communication links.
• Firmware Flash Compatibility: Maintains register compatibility across firmware builds to support seamless integration into sub-station control systems and motor control center networks.
• I/O Density Scaling: Integrates direct voltage and CT secondary current input channels into a compact panel-mounted enclosure to reduce footprint requirement inside control cabinets.

Frequently Asked Questions

Q: Can the 3720 ACM meter be wired directly to 600 VAC utility lines without potential transformers?

A: Yes, the unit supports direct line-to-line voltage connections up to 600 VAC across standard 3-phase 3-wire or 4-wire configurations.

Q: Is external current measurement supported via standard 5A current transformers?

A: Yes, current input terminals accept standard external Current Transformer (CT) secondary outputs rated at 5A or 1A.

Q: How does the meter retain cumulative energy data during a control power outage?

A: Historical energy records and cumulative kW data are automatically saved to onboard non-volatile memory chips without requiring external battery backup.

Field Installation Guidelines

• Panel Mount Hardware: Cut out the designated panel slot and insert the meter from the cabinet front face. Fasten side retention clamps securely to achieve a flush fit against the enclosure wall.
• Voltage and CT Secondary Wiring: De-energize high-voltage lines before connecting voltage sensing terminals and CT leads. Ensure CT secondary loops are never opened while primary lines are energized.
• Shield Cable Termination: Route instrument metering communication and signal lines in shielded twisted-pair cables. Ground the shield drain wire at a single point on the cabinet chassis earth ground rail.