TB20 Function module – Energy meter, 5 A

Part of the Helmholz decentralized fieldbus I/O system – TB20.?The energy meter function module can be used to measure all important current and voltage measurement values on 230 V AC networks. Input voltages (3 phases + N) can be connected directly to the module.

In addition to general status information, the module’s configuration can be used to show up to 7 readings in the input image table. And in the event of a system failure, the controllable meter’s values will be stored in non-volatile memory.

Parameters for the TB20 Function Module

• Overvoltage / undervoltage threshold
• Overcurrent threshold
• Zero transition timeout
• Enable energy meter
• 50/60 Hz line frequency
• 3-wire or 4-wire voltage measurement
• Process image table input values

Parameters for phases A, B, and C

• Primary current
• Secondary current
• Phase angle error correction (for current transformer phase angle error)
• Zero crossing, overvoltage / undervoltage?, overcurrent diagnoses

Configurable process input image table

• Get 7 readings at the same time
• RMS voltage A,B,C
• RMS current A,B,C
• A, B, C, and total real power/energy
• A, B, C, and total apparent power/energy
• A, B, C, and total reactive power/energy
• Frequency
• A, B, C, and total power factor
• Phase angle between the voltages or between the currents

Diagnostic messages

• Phase shift
• Overvoltage / undervoltage
• Overcurrent
• No zero crossing (no phase)
• Configuration errors

Input currents are coupled through current transformers. The Energy Meter module is designed for a maximum secondary current of 5 A. Any other rated secondary currents, as well as the use of Rogowski coils, are available upon request.

• Measures current, voltage, power, and energy
• 1 three-phase or 3 single-phase
• 3-wire and 4-wire voltage measurements
• Measures real, reactive, and apparent power and energy
• Energy meter with gate function; values are stored in the module in a non-volatile manner
• Configurable process input image table
• Diagnostic messages
• Current measurement via 5 A current transformer (secondary current)