Siemens SMART 7KT Multifunction Meter

Introduction

This manual describes the SMART 7KT multifunction meter. It is intended for planners, plant operators, commissioning engineers, and service and maintenance personnel.

Required basic knowledge: A general understanding of electrical engineering, safety regulations, and standards is necessary for installation and connection.

Components of the product

The product carton typically contains:

• 1 SMART 7KT meter
• 1 set of clamps (4 clamps) for mounting the meter on the panel door
• 1 Gasket
• 1 Operating instruction

[Image description: A diagram showing the SMART 7KT meter, four terminal clamps, and a rubber gasket.]

Safety Precautions

Please read and understand these instructions before installing, operating, or maintaining the equipment.

DANGER: Hazardous voltage. Will cause death or serious injury. Turn off and lock out all power supply to this device before working on it. Replace all covers before powering the device on.

CAUTION:

1. Read complete instructions prior to installation and operation.
2. Risk of electric shock.
3. The equipment must not be in close proximity to heating sources, oils, steam, caustic vapors, or other unwanted process by-products.

[Symbol description: Warning triangle with exclamation mark indicating caution.]

Technical Specification

Display: Large backlit Liquid Crystal display with 4 lines of 4 digits for measured values and a 5th line for energy values. Includes a graph for current loading indication.

Dimensions: Display size is 60.3 mm x 60.3 mm.

Measuring Inputs: Rated input voltage 11 to 300V AC (L-N) / 19 to 519V AC (L-L), Installation Category III (600V). Frequency range 45-65 Hz. Rated input current Nominal 1A / 5A AC.

Auxiliary Supply: 95V to 240V AC, ±10%, 50/60Hz (±5%).

Memory: Retains energy values, On hours counter, and configuration settings during power failure.

CT/PT Settings: Supports various CT/PT ratios and types, programmable within specified ranges.

Environmental Conditions: Operating temperature -10°C to 55°C, Storage temperature -20°C to 75°C. Humidity up to 85% non-condensing. Altitude up to 2000 meters. Indoor use only. Pollution degree II.

Mounting: Panel-door mounting. Protection Class II. Degree of protection Front: IP 65 (when mounted), Rear: IP20. Overvoltage Category III.

Dimensions and Weight: 96 x 96 x 55 mm, Weight: 360 gms.

Digital Input: 1 input, max input voltage 28 V DC.

Measured Variables

The meter measures and displays/communicates a wide range of electrical parameters including voltages (L-N, L-L), currents (phase, neutral), frequency, power factor, active, reactive, and apparent power, energy (import, export, total), demand values, phase angles, and harmonic distortion (THD).

Measuring Accuracy

Accuracy specifications are provided for various measured variables, adhering to IEC standards such as IEC 62053-21 for active energy and IEC 62053-23 for reactive energy.

IEC Standards

The meter conforms to IEC standards for energy accuracy (IEC 62053-21), EMC requirements (IEC 61326-1:2012), degree of protection (IEC 60529), safety (IEC 61010 series), and vibration/shock (IEC 62052-11).

Certifications

The SMART 7KT multifunction meter complies with relevant IEC standards, IPC electronics assembly standards, and RoHS directives.

Assembly and Installation

Installation: Prepare the panel cutout with specified dimensions (91.5 mm x 91.5 mm for a 96x96 mm front panel).

Steps:

1. Insert the unit into the panel.
2. Position the terminal clamps into their respective slots.
3. Push/slide all 4 clamps towards the panel evenly until engaged. Ensure the meter is securely tightened and does not move.

[Diagram description: Visual guide showing the insertion of the meter into the panel, positioning of clamps, and tightening mechanism.]

Note: Terminal screw tightening torque: 0.7 N-m to 0.8 N-m.

Mounting Distance: Maintain at least 100 mm distance between two meters when mounting on a panel door.

Installation Guidelines

• Terminals are not accessible after installation in a main control panel.
• Ensure conductors do not contact internal circuitry to prevent safety hazards.
• Install a circuit breaker or mains switch for power ON/OFF function, accessible to the operator.
• Short-circuit the secondary of external current transformers before disconnecting.
• Install only under specified environmental conditions.
• Installation of an external fuse (275V AC / 0.5Amp) is recommended.
• Remove the scratch-guard from the display during commissioning.

Wiring Guidelines

• Keep power supply OFF during wiring.
• Follow the terminal layout strictly and confirm all connections.
• Use lugged terminals.
• Use wires with adequate ratings and twists for reduced electromagnetic interference.
• Route cables away from internal EMI sources.
• Power source cables should have a cross-section of 1mm² to 2.5mm² and a current carrying capacity of 6A.
• Use copper cable (stranded or single core).

Demounting the meter

To demount the meter:

1. Pull the arm of the sliding clamps outwards and drag them away from the panel.
2. Disassemble the snap-fitted base clamps using a screwdriver.
3. Push the meter from the back out of the panel window and remove the gasket.

[Diagram description: Visual steps for demounting the meter, showing clamp release and removal.]

Connection

The document provides connection diagrams for various configurations:

• 3 Phase 4-Wire (commonly used)
• 3 Phase 4-Wire, 3 CTs
• 3 Phase 4-Wire, 3 CTs and 3 PTs
• 3 Phase 3-Wire, 2 CTs and 2 PTs
• 1 Phase 2-Wire, 1 CT

[Diagram description: Circuit diagrams illustrating different connection configurations for the SMART 7KT meter.]

Note: All fuse types mentioned are 0.5A, Class gG.

Configuration

The meter is configured using four dedicated keys: F1, F2, F3, F4.

• Reading Serial Number: Press F3 for 5 seconds to display the 8-digit serial number.
• Automatic/Manual Mode: Press F4 for 3 seconds to toggle between modes. In automatic mode, pages scroll every 5 seconds. Pressing any key temporarily switches to manual mode.
• Password Protection: Access to configuration requires a password. The default is 1000. Use F1 to navigate digits, F2/F3 to change values. Press F3+F4 for 3 seconds to enter/exit configuration mode.

Parameterization with Function Keys

Detailed tables outline the configuration parameters, their ranges, factory settings, and the corresponding function key sequences for access. This includes settings for password, network selection, CT/PT ratios, baud rate, parity, backlight, demand intervals, and page sequences.

Reading of Parameters

The meter allows users to read various parameters by pressing function keys (F1, F2, F3, F4). Each key navigates through different screens displaying specific measurements such as voltages, currents, power factors, energy values, harmonics, and demand data. The available screens vary depending on the system configuration (e.g., 3-phase 3-wire, 1-phase 2-wire).

Communication

Protocol and Interface: Supports Modbus RTU protocol via an integrated RS485 interface.

Communication Parameters: Configurable parameters include communication address (1-255), transmission mode (half duplex), data types (float, integer), transmission distance (up to 500m), transmission speed (300-19200 bps), parity (None, Odd, Even), and stop bits (1 or 2).

Connection Diagram: A diagram illustrates the connection of the SMART 7KT meter to a master device via an RS485-RS232 converter, including the use of a terminating resistor.

[Diagram description: A schematic showing a Master device communicating with multiple SMART 7KT meters via an RS485 network, including a converter and optional terminating resistor.]

Modbus Register Addresses

The manual provides extensive lists of readable and writable Modbus registers, detailing their addresses (hex and decimal), parameter names, data structure (float/integer), range, and length. These registers cover all measured variables, configuration settings, and harmonic data.

Maintenance

Guidelines

• Clean the equipment regularly to prevent blockage of ventilating parts.
• Use a clean dry or damp cloth for cleaning; avoid cleaning agents other than water.

Disposal and Recycling

Dispose of or recycle the module in accordance with applicable laws and regulations in your country.

Legal and Warranty Information

Siemens Ltd. states that product development is continuous and data may change without prior notice. The contents of this manual do not modify existing agreements. Trademarks are registered by Siemens AG or Siemens Industry, Inc.

Customer Care Toll-free: 1800 209 0987

Email: ics.india@siemens.com