Schneider Electric PM9P Power Meter

Product Overview

The Schneider Electric PM9P is an electrical quantity measuring unit designed for low-voltage (LV) networks including 1-phase + neutral (1P+N), 3-phase (3P), and 3-phase + neutral (3P+N) configurations.

It provides local indication of various electrical parameters:

• Instantaneous values: Voltage (U, V), Current (I, IN), Frequency (F), Power Factor (PF), Total Power (P total in W, var, VA), and Power per phase (W, var).
• Average and maximum average power values (W, var, or VA).
• Energy counters for kWh and kvarh.
• A time counter.

The PM9P features a pulse output for remote transfer of energy data.

Meter Components

The PM9P power meter features the following components:

• 1 - Power Supply: Input for the device's power.
• 2 - Pulse Output: Terminal for transmitting energy pulses.
• 3 - Backlit Screen: LCD display for showing measurements and configuration.
• 4 - Current Measurement Inputs: Connections for current transformers (CTs).
• 5 - Voltage Measurement Inputs: Connections for voltage measurement.
• 6 - Previous Page Key: Navigates to the previous screen or configuration step.
• 7 - Next Page Key: Navigates to the next screen or configuration step.
• 8 - Validation Key: Confirms selections or settings.

Configuration Options

The PM9P can be configured to match specific network requirements. Key configuration parameters include:

• CT Ratio: Setting the ratio for the connected Current Transformer (e.g., 5/5, 100/5, 1000/5).
• PT Ratio: Setting the ratio for the connected Potential Transformer (e.g., 690/100).
• Demand Type: Selecting the type of power demand to measure (e.g., W, VAr, VA).
• Pulse Output Configuration: Setting the units for the pulse output (e.g., kWh, VArh) and the pulse duration.
• Display Contrast: Adjusting the screen contrast for readability.

The configuration process involves navigating through menus using the dedicated keys.

On-Screen Display and Measurements

The PM9P's backlit display shows a variety of real-time electrical data:

Measured Values:

• Currents: Line 1, Line 2, Line 3 currents (I1, I2, I3) and Neutral Current (IN).
• Voltages: Line-to-Neutral Voltages (V1N, V2N, V3N) and Line-to-Line Voltages (U12, U23, U31).
• Powers: Total Active, Reactive, and Apparent Power. Active Power per Phase and Reactive Power per Phase are also displayed.
• Frequency: Network frequency (Hz).
• Power Factor (PF): The power factor of the load.

Energy and Demand:

• Active Energy: Total energy consumed in kWh.
• Reactive Energy: Total reactive energy consumed in kvarh.
• Power Demand: Current power demand, often displayed in kW.
• Maximum Power Demand: The highest recorded power demand (active, reactive, or apparent).
• Time Counter: Tracks operating hours or time under specific conditions (e.g., when Line-to-Neutral Voltage exceeds 50V).

A demand graph visually represents the power demand over time, indicating peak usage relative to a set limit.

Connections and Wiring

The PM9P supports various Current Transformer (CT) ratios for flexible installation:

• 4.3 Ct: For specific CT configurations.
• 3.3 Ct: Another common CT ratio.
• 3.2 Ct: Supported CT ratio.
• 2.1 Ct: Supported CT ratio.

The device operates with voltage inputs ranging from 450V to 1000V, depending on external potential transformers (VTs).

Key connections include:

• (1) Protection: Connection for protective functions.
• (2) Short-circuiting Unit: Terminal for a short-circuiting device.
• (3) Pulse Receiver: Connection for external pulse reception.

The pulse output is a static type, rated for 350V DC and AC peak, with a 130 mA current capacity at 25°C and 5 kV insulation.