Honeywell Multiple Meter Units, MMU Installation Instructions Manual

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Honeywell Multiple Meter
Units (MMU)

KWH AND KWH/DEMAND

INSTALLATION INSTRUCTIONS

HONEYWELL MULTIPLE METER UNITS (MMU)

TABLE OF CONTENTS

Section 1.0 Safety Label Definitions and Information 4

Section 2.0 Precautionary and Safety Information 5

Section 3.0 Introduction to Multiple Meter Units (MMUs) 6

Section 3.1 Application 6

Section 3.2 General Description 6

Section 4.0 Description of Multiple Meter Units (MMUs) 7

Section 4.1 Class 100/200 Meters 7

Section 4.2 Class 320 Meters 7

Section 4.3 Green Class Meters 7

Section 4.4 IDR (Interval Data Recorders) 7

Section 5.0 MMU Cabinet Installation 8

Section 5.1 MMU Cabinet Description 8

Section 5.2 MMU Cabinet Installation 8

Section 6.0 MMU Cabinet Wiring 10

Section 6.1 MMU Cabinet Wiring 10

Section 6.2 MMU Cabinet Wiring 11

Section 6.3 MMU Cabinet Wiring 11

Section 7.0 Individual Meter Wiring Diagrams and Installation Procedures 12

Section 7.1 Class 100, 200, and Green Class Meter Wiring Diagrams

and Installation Procedures

Section 7.2 Class 320 Meter Wiring Diagrams and Installation

Procedures

Section 7.3 IDR (Interval Data Recorders) Wiring Diagrams and

Installation Procedures

Appendix A System Wiring Guides 14

Appendix B System Wiring Guides 15

Appendix C Modern System Configuration Diagrams 16

Appendix D Hard Wired System Configuration Diagrams 17

Appendix E Hard Wired System Configuration Diagrams (Continued) 18

Section 8.0 Troubleshooting 19

Section 9.0 Meter Technical Specifications 19

Section 10.0 Meter Limited Warranty 20

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13

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HONEYWELL MULTIPLE METER UNITS (MMU)

1.0 SAFETY LABEL DEFINITIONS AND
INFORMATION

The MMU Style Meter may contain one or more of the following labels. Operator(s)
should familiarize themselves with the meaning of each label to minimize risk.

The presence of this label is a cautionary indicator identifying a
danger risk. The manual should be consulted prior to proceeding.

The presence of this label indicates an electrical shock hazard exists
in the location or area where the label is placed. Prior to proceeding,
the MAINS power must be disconnected and the manual consulted for
safety information.

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HONEYWELL MULTIPLE METER UNITS (MMU)

CAUTION

CAUTION

CAUTION

CAUTION

2.0 PRECAUTIONARY AND SAFETY
INFORMATION

Internal circuit card components are extremely sensitive to electrostatic
discharge. Be careful not to touch internal circuitry prior to discharging any
static buildup on your person. To discharge yourself, touch a grounded metal
object such as conduit or an earth-grounded metal enclosure.

High voltages present on main PCB terminal block TB1 screw terminals. Risk
of serious injury and/or electrical shock exists. Prior to performing any wiring
operations, review all contents of the user manual and de-energize the MAINS
power switch. Only qualified personnel should perform installation wiring.
Installation wiring must comply with all local and national electrical codes.

Failure to ground the enclosure creates a possible shock hazard. Do not
operate the MMU Style Meter without a protective earth wire attached securely
to the PE terminal screw. After installing protective earth wiring, secure the
screw tightly (7 N-m torque.)

NEVER open front panel of unit while unit has MAINS power applied. Failure to
comply can increase the risk of serious injury and/or electrical shock.

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HONEYWELL MULTIPLE METER UNITS (MMU)

3.0 INTRODUCTION TO MULTIPLE METER
UNITS (MMU)

3.1 Application

This Install Manual describes a line of Multiple Meter Units (MMU) used in monitoring
electrical usage in commercial, industrial, or institutional facilities. Voltage and current
are continuously measured and updated to provide highly accurate, true RMS power
information via current sensors.

3.2 General Description

The MMU allows for compact installation of multiple meters that allows for easy and
centralized reading. A single MMU cabinet can be configured to contain up to 8, 16, or
24 meters of different voltage configurations (i.e. 208V and 480V).

Fig. 1. MMU 8 Cabinet.

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HONEYWELL MULTIPLE METER UNITS (MMU)

4.0 DESCRIPTION OF MULTIPLE METER
UNITS (MMU)

MMU cabinets can be used to house Class 100, Class 200, Class 320 and Green
Class meters. IDRs, (Interval Data Recorders) can also be installed in the MMU
cabinets with the meters.
These units are briefly described below:

4.1 Class 100/200 Meters

The Class 100 and Class 200 meters are power meters for use in sub metering
applications. The devices take inputs from current sensors and the line voltage and
output kW hours in pulses.

Refer to Sections 5, 6, &7 for general installation instructions on installing Class 100 or
Class 200 meters into a MMU Cabinet.

4.2 Class 320 Meters

The Class 320 meter is a 3-element meter with communication. The device is used to
monitor electric power usage after the utility meter and store kW and kVAR data for
automatic meter reading.

Refer to Sections 5, 6, &7 for general installation instructions on installing Class 320
meters into a MMU Cabinet.

4.3 Green Class Meters

The Green Class Meter is a power meter for use in sub metering applications. The
devices take inputs from current sensors and the line voltage and output kW hours in
pulses.

Refer to Sections 5, 6, &7 for general installation instructions on installing Class 320
meters into a MMU Cabinet.

4.4 IDR (Interval Data Recorders)

The Interval Data Recorder (IDR) is an energy data collection device with
communication. The device is used to count digital pulses of the utility meter and store
data for automatic meter reading. Various communications types are provided, EZ7,
Modbus RTU, Modbus TCP/IP, BACnet MS/TP, BACnet IP, and Lonworks TP/FT-10.

Refer to Sections 5, 6, &7 for general installation instructions on installing IDR meters
into a MMU Cabinet.

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