Section 1.0Safety Label Definitions and Information4
Section 2.0Precautionary and Safety Information5
Section 3.0Introduction to Multiple Meter Units (MMUs)6
Section 3.1Application6
Section 3.2General Description6
Section 4.0Description of Multiple Meter Units (MMUs)7
Section 4.1Class 100/200 Meters7
Section 4.2Class 320 Meters7
Section 4.3Green Class Meters7
Section 4.4IDR (Interval Data Recorders)7
Section 5.0MMU Cabinet Installation8
Section 5.1MMU Cabinet Description8
Section 5.2MMU Cabinet Installation8
Section 6.0MMU Cabinet Wiring10
Section 6.1MMU Cabinet Wiring10
Section 6.2MMU Cabinet Wiring11
Section 6.3MMU Cabinet Wiring11
Section 7.0Individual Meter Wiring Diagrams and Installation Procedures12
Section 7.1Class 100, 200, and Green Class Meter Wiring Diagrams
and Installation Procedures
Section 7.2Class 320 Meter Wiring Diagrams and Installation
Procedures
Section 7.3IDR (Interval Data Recorders) Wiring Diagrams and
Installation Procedures
Appendix ASystem Wiring Guides14
Appendix B System Wiring Guides15
Appendix CModern System Configuration Diagrams16
Appendix DHard Wired System Configuration Diagrams17
Appendix EHard Wired System Configuration Diagrams (Continued)18
Section 8.0Troubleshooting19
Section 9.0Meter Technical Specifications19
Section 10.0Meter Limited Warranty20
12
13
13
62-0400-012
Page 3
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.
362-0400-01
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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.
62-0400-014
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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.
562-0400-01
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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.
62-0400-016
Page 7
HONEYWELL MULTIPLE METER UNITS (MMU)
M34287
SIDE VIEWFRONT VIEW
B
C
7
(178)
3-3/8
(86)
2
(51)
7/16 (11)
DIA
1-1/4 (32)
1-1/4 (32)
3-3/8
(86)
DOOR
CLAMP
PADLOCKING
HASP
A
MMU
DIMENSIONS
IN INCHES AND (MM)
AB C
HMMU-8
HMMU-16
HMMU-24
24 (610)
24 (610)
30 (762)
12 (305)
20 (508)
24 (610)
1-1/4 (32)
3 (76)
3 (76)
MMU
METER
CONFIGURATION
TAS K
METER
SPACES
ACROSS DOWN
HMMU-8
HMMU-16
HMMU-24
2 (51)
4 (102)
5 (127)
4 (102)
4 (102)
5 (127)
8 (203)
16 (406)
24 (610)
5/8
(16)
7/16
(11)
5.0 MMU CABINET INSTALLATION
5.1 MMU Cabinet Description
The MMU Cabinet is made from 14 or 16 gauge steel. The cabinet has an ANSI 61
gray exterior finish. It contains a seam that is continuously welded and ground smooth.
The heavy gauge continuous hinge pin that connects the door and the enclosure body
are removable. There are screw-down clamps located on the door for easy locking of
the cabinet.
Fig. 2. Cabinet Dimensions.
5.2 MMU Cabinet Installation
The dimensions of the MMU8, MMU16, and MMU 24 cabinet are shown in Figure 2.
The MMU cabinet shall be mounted in an upright orientation as shown in Figure 3. The
MMU cabinet must only be installed by personnel with the proper electrical licensing
for the intended location.
Use appropriately sized mounting hardware to fasten the MMU enclosure to the
selected mounting surface. The four housing mounting holes are located on the upper
and lower mounting brackets.
Serviceability/field Repair Service and repair should be completed by qualified
personnel only. Meters cannot be calibrated in the field. Adjustment is limited to reset
of the meter display and should be performed by qualified personnel only. The
configuration is stated on each meter nameplate.
The MMU enclosure is not supplied with knockouts. The installer will make the
necessary entrances to the enclosure to supply entry for the voltage and current
sensor conductors. The conduit and fittings must be appropriate for the application and
installed in a manner to meet national and local electrical codes.
762-0400-01
Page 8
HONEYWELL MULTIPLE METER UNITS (MMU)
Spaces not occupied by meters will have a blank metal cover over the display window.
Fig. 3. Example of an 8 Meter MMU Enclosure.
62-0400-018
Page 9
HONEYWELL MULTIPLE METER UNITS (MMU)
6.0 MMU CABINET WIRING
6.1 General Wiring Instructions
Wiring of the individual MMU meters are the same as for a stand-alone meter. See
section 7.0.
Refer to the Individual Meter Installation Manual for individual meter wiring.
M33744
Fig. 4. MMU Terminal.
Some MMU units may come from the factory already pre-wired for the voltage to the
installed meters. When supplied this way, there will be a terminal block located inside
the MMU that is labeled A, B, C, N. See Figure 4. The letters refer to the three phases
and neutral connections already made to the meters. The power only has to be landed
on the terminal block in order to power all of the meters in the MMU.
As with the stand-alone meters, the power wires must be fused. The size of the fuse
will be determined by the number of meters installed in the MMU. The Littelfuse KLDR
series are used for this component. Each meter point requires 1/10 amp fusing. With 8
meters, a one amp fuse would be acceptable.
The current sensor wiring is installed by bringing in the leads from their source and
landing them on the appropriate terminals on the meter’s sensor input terminals.
The proper current sensor wiring to each meter is described in each individual Meter
Installation Manual.The MMU style meters are wired the same way, but it is important
that proper routing procedures are followed when the current sensor conductors are
installed.
962-0400-01
Page 10
HONEYWELL MULTIPLE METER UNITS (MMU)
a. The sensor leads cannot be installed randomly and should be bundled
together when they are routed to the meters which are mounted on the door
of the MMU. They shall be secured and routed away from the power wiring
and the communication cabling. They shall be bundled with appropriate
means such as clamps, wire ties, spiral wrap, etc.
b. To avoid damage to the bundled conductors when the door is opened and
closed, tubing, guides, spiral wrap, clamps, or other approved means shall
be used. This is required to provide proper protection and stress relief for the
conductors.
c. All wiring is to be routed away from any points that may possibly damage or
abrade the insulation - such as sharp edges, screw threads, burrs, or any
other item that may have been installed in the MMU enclosure. The final wiring must allow the door to freely open and close without coming in contact
with anything that could damage it.
NOTE: Following the proper wiring procedures will help to assure a satisfactory
installation.
NOTE: Units housed in UL type 1 enclosures must only be installed in indoor loca-
tions, where they will not be affected by the elements
6.2 Grounding
The meters and enclosure must be properly grounded for safety. A protective earth
ground lug is provided for this purpose.
Failure to ground the enclosure creates a
possible shock hazard. There are two terminals that attach to the base ground stud.
Do not operate without protective earth
wire attached securely to the PE terminal
screw. After installing the protective earth
wiring, secure the screw tightly (7 N-m
torque).
Fig. 5. Base Ground Stud.
6.3 RS485 Communication Wiring
The RS485 Communication wiring is installed by connecting the leads to the
appropriate terminals on the 3-position RS485 terminal strip mounted on the back
panel of the enclosure. The wiring terminals are labeled GND, HIGH, and LOW to
correspond to the appropriate connections of the communication cabling. Tighten the
terminals to 9 in-lbs of torque.
for communication wiring in MMU enclosures. The communication cabling must be
routed away from the mains wiring.
Class 1 rated, Belden 1120A cable (600V) is to be used
62-0400-0110
Page 11
HONEYWELL MULTIPLE METER UNITS (MMU)
7.0 INDIVIDUAL METER WIRING DIAGRAMS
AND INSTALLATION PROCEDURES
7.1 Class 100, 200 and Green Class Meter Wiring
Diagrams and Installation Procedures
Wiring of each individual MMU meter is the same as for it’s respective stand-alone
meter. Refer to the stand alone Class 100, 200, and Green Class Meter Installation
Manuals for detailed wiring diagrams, and installation procedures. The menu buttons
on the Class 100 MMU, 200 MMU, and Green Class MMU Meters are in the same
positions as a stand alone Class 100, 200 or Green Class Meters. The MMU Menu
Buttons are identified in the figure below.
MENU
UP
Fig. 6. Class 100, 200, and Green Class Meter Menu Buttons.
1162-0400-01
SELECT
DOWN
M34246
Page 12
HONEYWELL MULTIPLE METER UNITS (MMU)
M33747
MENU
SELECT
UP
DOWN
7.2 Class 320 Meter Wiring Diagrams and Installation
Procedures
Wiring of each individual Class 320 MMU meter is the same as for its respective standalone meter. Refer to the stand alone Class 320 Meter Installation Manual for detailed
wiring diagrams and installation instructions.
NOTE: The menu buttons on the Class 320 MMU Meter are reversed from the stand
Fig. 7. The Menu Buttons on a Class 320 MMU Meter are Reversed from the Stand
alone Class 320 Meters. The menu buttons positions are identified in the figure below.
Alone Version.
7.3 IDR (Interval Data Recorders) Wiring Diagrams and
Installation Procedures
Refer to the IDR Installation Manual for detailed wiring diagrams and installation
instructions.
62-0400-0112
Page 13
HONEYWELL MULTIPLE METER UNITS (MMU)
Appendix A - System Wiring Guides
PC
Connects via
USB port on PC
3 FT USB A to USB B cable
CHANNEL 1 OF 3
(ONE OF THREE CHANNELS
SHOWN FOR CLARITY.)
IDR A
RJ-45
AC ADAPTER
8-COND.
RJ-45
USB Key
(SUB-USBK)*
FLAT MODULAR CABLE
UP TO 4000 FEET TOTAL
STAR CONNECTION
6-COND.
RJ-45
RJ-11
4-CONDUCTOR
DAISY-CHAIN OR
6-COND.
RJ-45
(UP TO 8
METERS)
UP TO 52 IDRS
PER CHANNEL
NOTE: METERS 1-8 MUST BE INSTALLED WITHIN 500 FEET OF IDR.
CONNECTION CABLE TYPE CONNECTOR
IDR TO HONEYWELL METERS 1-8 6-COND. 22-26 AWG RJ-45(PINS 1 & 8 NOT USED)
NOTE: INTERIOR INTERCONNECTING COMMUNICATIONS ARE SUPPLIED
WITH THE PRE-WIRED MMU-TYPE METERING CABINETS.
NOTE: WHEN CONSTRUCTING FIELD-INSTALLED CABLES, MODULAR CABLES
MUST BE MADE SO THAT THE INDIVIDUAL WIRES GO THROUGH ON
THE SAME PIN NUMBER.
3RD
PARTY
METER
3RD
PARTY
METER
3RD
PARTY
METER
PAIR OF WIRES
(#22-#14 AWG)
M33482
PC
Appendix B - System Wiring Guides
62-0400-0114
Page 15
HONEYWELL MULTIPLE METER UNITS (MMU)
Appendix C - Modem System Configuration Diagrams
UP TO 8 METERS
IDR-8, USING HONEYWELL
PC
METERS:
RS-232 SERIAL PORT
COM1 THROUGH
COM4 MAX. 15'
LOCAL
MODEM
CHANNEL 1
~
~
UP TO 4000
FEET TOTAL
UP TO 52
IDRS PER
CHANNEL
IDR Z
IDR A
~
~
UP TO 8 METERS
TELEPHONE
LINK
AC ADAPTER
IDR-16, USING HONEYWELL
PC
TELEPHONE
LINK
RS-232 SERIAL PORT
COM1 THROUGH
COM4 MAX. 15'
LOCAL
MODEM
CHANNEL 1
~
~
RS-485 to RS-232
Key (SUB-EKMT)
AC ADAPTER
CHANNEL 3
RS-485 to RS-232
Key (SUB-EKMT)
CHANNEL 3
METERS:
UP TO 4000
FEET TOTAL
UP TO 52
IDRS PER
CHANNEL
IDR Z
IDR A-B
UP TO 4000
FEET TOTAL
UP TO 26
IDR-16S
PER CHANNEL
IDR Y-Z
IDR A-B
UP TO 4000
FEET TOTAL
UP TO 26
IDR-16S
PER CHANNEL
IDR Y-Z
IDR A
CHANNEL 2
~
~
~
~
CHANNEL 2
~
~
UP TO 8 METERS
UP TO 8 METERS
UP TO 16 METERS
UP TO 16 METERS
UP TO 16 METERS
UP TO 16 METERS
NOTES: METERS -8 (OR -16) MUST BE INSTALLED WITHIN 500 FEET OF IDR.
METERS -8 (OR -16) USE 6-CONDUCTOR CABLE.
1562-0400-01
M33483
Page 16
HONEYWELL MULTIPLE METER UNITS (MMU)
UP TO 8 METERS
UP TO 8 METERS
CHANNEL 2
~
~
~
~
CHANNEL 1
CHANNEL 3
UP TO 4000
FEET TOTAL
UP TO
52 IDRS
NOTES: METERS -16 MUST BE INSTALLED WITHIN 500 FEET OF IDR.
METERS -16 USE 6-CONDUCTOR CAB
AC ADAPTER
RS-232 Key
(SUB-RS232K)*
RS-232 SERIAL
PORT
COM1-COM4
UP TO 8 METERS
UP TO 8 METERS
15 FEET
MAX
IDR-8, USING HONEYWELL
®
METERS:
IDR
IDR
IDR
IDR
PC
UP TO 4000
FEET TOTAL
UP TO
52 IDRS
M33484
Appendix D - Hard Wired System Configuration
Diagrams
62-0400-0116
Page 17
HONEYWELL MULTIPLE METER UNITS (MMU)
IDR-16, USING OTHER UTILITY-TYPE METERS
(GAS, WATER, ETC.)
UP TO 16 METERS
UP TO 16 METERS
CHANNEL 2
~
~
~
~
CHANNEL 1
CHANNEL 3
AC ADAPTER
UP TO 16 METERS
UP TO 16 METERS
IDR-16, USING HONEYWELL
®
METERS
UP TO 16 METERS
UP TO 16 METERS
CHANNEL 2
~
~
~
~
CHANNEL 1
CHANNEL 3
UP TO 26
IDR-16S
NOTES: METERS -#16 MUST BE INSTALLED WITHIN 500 FEET OF IDR.
METERS -16 USE 6-CONDUCTOR CABLE.
AC ADAPTER
RS-232 Key
(SUB-RS232K)
6 FOOT CABLE
PROVIDED BY
HONEYWELL
(15 FEET MAX)
RS-232
SERIAL PORT
COM1-COM4
UP TO 16 METERS
UP TO 16 METERS
AC ADAPTER
IDR
IDR
IDR
IDR
IDR
IDR
IDR
IDR
M33485
PC
UP TO 4000
FEET TOTAL
UP TO 4000
FEET TOTAL
UP TO 26
IDR-16S
PC
6 FOOT CABLE
PROVIDED BY
HONEYWELL
(15 FEET MAX)
RS-232
SERIAL PORT
COM1-COM4
RS-232 Key
(SUB-RS232K)*
UP TO 4000
FEET TOTAL
UP TO 4000
FEET TOTAL
AC ADAPTER
AC ADAPTER
UP TO 26
IDR-16S
UP TO 26
IDR-16S
AC ADAPTER
NOTES: METERS MUST BE INSTALLED WITHIN 500 FEET OF IDR.
METER CONNECTED WITH A PAIR OF #22-#14 AWG CONDUCTORS.
Appendix E - Hard Wired System Configuration
Diagrams
1762-0400-01
Page 18
HONEYWELL MULTIPLE METER UNITS (MMU)
8.0 TROUBLESHOOTING
The Honeywell meters are calibrated and tested at the factory before being packaged
and shipped. If installed properly and in accordance with these installation instructions,
your Honeywell meter should provide years of trouble-free service. If the meter should
not function, the following guide will assist in troubleshooting the installation.
Refer to the individual Meter Installation Manual for detailed troubleshooting
information.
9.0 METER TECHNICAL SPECIFICATIONS
Refer to the individual Meter Installation Manual for detailed technical specifications.
62-0400-0118
Page 19
HONEYWELL MULTIPLE METER UNITS (MMU)
10.0 METER LIMITED WARRANTY
Subject to the exclusions listed below, Honeywell will either repair or replace (at its
option) any product that it manufactures and which contains a defect in material or
workmanship.
The following exclusions apply:
1. This Limited Warranty is only effective for a period of (5) five years following the
date of manufacture when installed in accordance with manufacturer’s instructions by qualified personnel.
2. Honeywell must be notified of the defect within ninety (90) days after the defect
becomes apparent or known.
3. Buyer’s remedies shall be limited to repair or replacement of the product or component which failed to conform to Honeywell’s express warranty set forth above.
4. Buyer shall be responsible for all freight costs and shall bear all risk of loss or
damage to returned goods while in transit.
5. This Limited Warranty does not cover installation, removal, reinstallation, or labor
costs, and excludes normal wear and tear. Buyer shall provide labor for the
removal of the defective component or item and installation of its replacement at
no charge to Honeywell.
6. This Limited Warranty does not cover any product if: (i) a product is altered or
modified from its original manufactured condition, (ii) any repairs, alterations or
other work has been performed by Buyer or others on such item, other than work
performed with Honeywell’s authorization and according to its approved procedures; (iii) the alleged defect is a result of abuse, misuse, improper maintenance,
improper installation, accident or the negligence of any party; (iv) damaged as a
result of events beyond Honeywell’s control or other force majeure events or (v)
used in conjunction with equipment, components, accessories, parts or materials not supplied or approved by Honeywell. This Limited Warranty is limited to
the obligation to repair or replace the manufactured product. This is the sole and
exclusive remedy for any breach of warranty.
7. IN NO EVENT SHALL HONEYWELL BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL OR PUNITIVE DAMAGES (INCLUDING ANY DAMAGE FOR LOST PROFITS) ARISING OUT OF OR IN
CONNECTION WITH THE FURNISHING OF PRODUCTS, PARTS OR SERVICES, OR THE PERFORMANCE, USE OF, OR INABILITY TO USE ANY
PRODUCTS, PARTS OR SERVICES, SALE OF OR OTHERWISE, WHETHER
BASED IN CONTRACT, WARRANTY, TORT, INCLUDING WITHOUT LIMITATION, NEGLIGENCE, OR ANY OTHER LEGAL OR EQUITABLE THEORY.
EXCEPT AS EXPRESSLY PROVIDED HEREIN, HONEYWELL MAKES NO
WARRANTY OF ANY KIND, EXPRESS OR IMPLIED WITH RESPECT TO ANY
PRODUCTS, PARTS OR SERVICES PROVIDED BY HONEYWELL INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
8. PRODUCTS OR COMPONENTS DISTRIBUTED, BUT NOT MANUFACTURED,
BY HONEYWELL ARE NOT WARRANTED BY HONEYWELL AND BUYER
MUST INSTEAD RELY ON THE REPRESENTATIONS AND WARRANTIES, IF
ANY, PROVIDED DIRECTLY TO THE BUYER BY THE MANUFACTURER OF
SUCH PRODUCT OR COMPONENT.