Lenze AC Tech MCH Series User manual

MCH Series Drives
Metasys N2 Communications Guide

This documentation applies to the use of an MCH Series Variable Frequency Drive with Metasys N2 protocol and
should be used in conjunction with the MCH Series Installation and Operation Manual (Document MH01) that
shipped with the drive. These documents should be read in their entirety as they contain important technical data
and describe the installation and operation of the drive.
Metasys® is a registered trademark of Johnson Controls, Inc., http://www.johnsoncontrols.com
© 2003 Lenze AC Tech Corporation
No part of this documentation may be copied or made available to third parties without the explicit written approval
of Lenze AC Tech Corporation. All information given in this documentation has been carefully selected and tested
for compliance with the hardware and software described. Nevertheless, discrepancies cannot be ruled out. Lenze
AC Tech does not accept any responsibility nor liability for damages that may occur. Any necessary corrections will
be implemented in subsequent editions.
About These Instructions

i RG-MHMET
Contents
1 Safety Information.............................................................................................................1
1.1 Warnings, Cautions and Notes ..............................................................................1
1.1.1 General ....................................................................................................1
1.1.2 Application ...............................................................................................1
1.1.3 Installation ...............................................................................................1
1.1.4 Electrical Connection................................................................................2
1.1.5 Operation .................................................................................................2
2 Introduction.......................................................................................................................3
2.1 Metasys N2 Communications................................................................................3
2.2 Serial Communications Wiring ..............................................................................3
3 Drive Setup and Programming...........................................................................................4
3.1 Serial Communication Setup.................................................................................4
3.2 Communication Overrides.....................................................................................5
4 MCH N2 Points..................................................................................................................6
4.1 Metasys N2 Point Map..........................................................................................6
4.2 Analog Input (AI) Point Descriptions.......................................................................7
4.3 Binary Input (BI) Point Descriptions .......................................................................8
4.4 Analog Output (AO) Point Descriptions...................................................................9
4.5 Binary Output (BO) Point Descriptions ...................................................................11
4.6 Reference and Links .............................................................................................11

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Safety Information
1 Safety Information
1.1 Warnings, Cautions and Notes
1.1.1 General
Some parts of Lenze controllers (frequency inverters, servo inverters, DC controllers) can be live, moving
and rotating. Some surfaces can be hot.
Non-authorized removal of the required cover, inappropriate use, and incorrect installation or operation
creates the risk of severe injury to personnel or damage to equipment.
All operations concerning transport, installation, and commissioning as well as maintenance must be
carried out by qualified, skilled personnel (IEC 364 and CENELEC HD 384 or DIN VDE 0100 and IEC report
664 or DIN VDE0110 and national regulations for the prevention of accidents must be observed).
According to this basic safety information, qualified skilled personnel are persons who are familiar with
the installation, assembly, commissioning, and operation of the product and who have the qualifications
necessary for their occupation.
1.1.2 Application
Drive controllers are components designed for installation in electrical systems or machinery. They are
not to be used as appliances. They are intended exclusively for professional and commercial purposes
according to EN 61000-3-2. The documentation includes information on compliance with EN 61000-3-2.
When installing the drive controllers in machines, commissioning (i.e. the starting of operation as directed)
is prohibited until it is proven that the machine complies with the regulations of the EC Directive 98/37/EC
(Machinery Directive); EN 60204 must be observed.
Commissioning (i.e. starting drive as directed) is only allowed when there is compliance to the EMC
Directive (2004/108/EC).
The drive controllers meet the requirements of the Low Voltage Directive 2006/95/EC. The harmonised
standards of the series EN 50178/DIN VDE 0160 apply to the controllers.
The availability of controllers is restricted according to EN 61800-3. These products can cause
radio interference in residential areas. In the case of radio interference, special measures may be
necessary for drive controllers.
1.1.3 Installation
Ensure proper handling and avoid excessive mechanical stress. Do not bend any components and do not
change any insulation distances during transport or handling. Do not touch any electronic components
and contacts. Controllers contain electrostatically sensitive components, which can easily be damaged by
inappropriate handling. Do not damage or destroy any electrical components since this might endanger
your health! When installing the drive ensure optimal airflow by observing all clearance distances in the
drive's user manual. Do not expose the drive to excessive: vibration, temperature, humidity, sunlight, dust,
pollutants, corrosive chemicals or other hazardous environments.

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Safety Information
1.1.4 Electrical Connection
When working on live drive controllers, applicable national regulations for the prevention of accidents (e.g.
VBG 4) must be observed.
The electrical installation must be carried out in accordance with the appropriate regulations (e.g.
cable cross-sections, fuses, PE connection). Additional information can be obtained from the regulatory
documentation.
The regulatory documentation contains information about installation in compliance with EMC (shielding,
grounding, filters and cables). These notes must also be observed for CE-marked controllers.
The manufacturer of the system or machine is responsible for compliance with the required limit values
demanded by EMC legislation.
1.1.5 Operation
Systems including controllers must be equipped with additional monitoring and protection devices according
to the corresponding standards (e.g. technical equipment, regulations for prevention of accidents, etc.).
You are allowed to adapt the controller to your application as described in the documentation.
DANGER!
• After the controller has been disconnected from the supply voltage, do not touch the live
components and power connection until the capacitors have discharged. Please observe the
corresponding notes on the controller.
• Do not continuously cycle input power to the controller more than once every three minutes.
• Close all protective covers and doors during operation.
WARNING!
Network control permits automatic starting and stopping of the inverter drive. The system design
must incorporate adequate protection to prevent personnel from accessing moving equipment
while power is applied to the drive system.
Table 1: Pictographs used in these instructions
Pictograph Signal word Meaning Consequences if ignored
DANGER! Warning of Hazardous Electrical
Voltage.
Reference to an imminent danger that may
result in death or serious personal injury if the
corresponding measures are not taken.
WARNING! Impending or possible danger
for persons
Death or injury
STOP! Possible damage to equipment Damage to drive system or its surroundings
NOTE Useful tip: If observed, it will
make using the drive easier

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Introduction
2 Introduction
This document will explain how to operate a Lenze-AC Tech MCH Variable Frequency Drive using Metasys
N2 protocol. It is intended as a serial communications supplement only and will not discuss normal
drive operations. For more information regarding normal drive setup and functionality, refer to the MCH
Installation and Operation Manual (MH01).
2.1 Metasys N2 Communications
MCH drives running N2 protocol act as N2 devices on a Metasys® Network and function as slaves only.
Thus the device communicating with an MCH drive must be an N2 master. The communication rate is 9600
bps with 8 data bits, no parity, 1 start bit and 1 stop bit. The bit sequence is as follows:
DATA
START 1 2 3 4 5 6 7 8 STOP
2.2 Serial Communications Wiring
Figure 1 illustrates the MCH Series Terminal Strip and connections for the N2 Metasys network.
21 5A 5B 6 10A 10B 2 13A12A 13B 13C 13D 14 15 2 TXBRXA 16 17 18
N2
Reference
N2-
N2+
Figure 1: MCH Terminal Strip
The N2+ terminal is connected to MCH drive terminal RXA
The N2- terminal is connected to MCH drive terminal TXB
The N2 Reference is connected to MCH drive terminal 2.

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Drive Setup & Programming
3 Drive Setup and Programming
Most drive parameters (including those required for serial communications) are not accessible through the
N2 Network. They can only be accessed by entering the Programming Mode of the drive itself. Refer to the
MCH Installation and Operation Manual (MH01) for more information.
When in Programming Mode, the drive will not accept any write, memorize or characterize commands from
the N2 Network. This is necessary to prevent conflicts between the two modes of parameter modification.
3.1 Serial Communication Setup
The factory default values for all drive parameters are setup to allow immediate serial communications
(without serial start and serial speed/setpoint commands). For serial speed/setpoint and/or serial start
control, modify the setting of Drive Parameter #30 (Control). The drive parameters that are required for
serial communications, including Drive Parameter #30, are described below.
30 CONTROL This parameter should be set to accommodate the specific application intent:
NORMAL Serial start and serial speed/setpoint commands are invalid.
Therefore Points 3-03, 3-04 and 3-05 are forced to act as
monitor points only and Point 4-01 can only be commanded
to 0 (STOP).
NORM NO HAND Same as NORMAL except the HAND/OFF/AUTO, herein
referred to as H/O/A, is limited to settings of OFF and AUTO.
SERIAL SPEED Serial start commands are invalid. Point 4-01 can only be
commanded to 0 (STOP). Points 3-03, 3-04 and 3-05, the
serial speed/setpoint commands, are valid in AUTO H/O/A
only.
S SPD/NO HAND Same as SERIAL SPEED except H/O/A is limited to settings of
OFF and AUTO.
SERIAL AUTO This setting forces the drive to be started over the N2 Network
when in AUTO H/O/A. Serial start and serial speed/setpoint
commands are all valid in AUTO H/O/A.
S AUTO/NO HND Same as SERIAL AUTO except H/O/A is limited to settings of
OFF and AUTO. Serial STOP commands are accepted from the
N2 Network regardless of this parameter setting.
57 SERIAL This parameter must be set to either WITH TIMER (default) or W/O TIMER for the
drive to communicate with the N2 Network. Serial communications will not work
if this parameter is set to DISABLED.
58 SERIAL ADDRESS This parameter contains the address of the N2 Network device. It is adjustable
from 1−255.

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Drive Setup & Programming
60 SERIAL TIMEOUT This parameter makes the serial watchdog timeout period selectable. It has a
minimum value of 10 seconds and maximum value of 1800 seconds. The default
value is 120 seconds. If no action is to be taken when a serial watchdog timeout
occurs, Drive Parameter #57 (Serial) should be set to W/O TIMER. This will disable
the watchdog timer. Otherwise Drive Parameter #57 (Serial) should be set to WITH
TIMER and if the drive is running in AUTO HOA, it will trip into a SERIAL FAULT
when the watchdog timeout occurs, stopping the drive.
When a watchdog timeout occurs in AUTO HOA, the drive is taken out of serial
control and any overrides that were in effect are released.
3.2 Communication Overrides
Overrides are also released under the following circumstances:
• Drive Parameter #57 (Serial) is set to DISABLED.
• Drive Parameter #58 (Serial Address) is changed.
• Drive Parameter #30 (Control) is changed.
• Drive Parameter #65 (Program) is changed to RESET 60 or REST 50 (i.e., a factory reset is
performed) and Drive Parameter #58 (Serial Address) was not previously set to 30. In this case,
serial communications will be terminated immediately.
• Drive Parameter #65 (Program) is changed to RESET 60 or REST 50 (i.e., a factory reset is
performed) and Drive Parameter #30 (Control) was not previously set to NORMAL.
• The drive HOA is changed from AUTO to either HAND or OFF.
In the above circumstances, if the drive is running in AUTO HOA and control parameters are unlocked, then
the drive will be brought to a STOP. The resulting stop condition will depend on the setting Drive Parameter
#30 (Control):
• KSTOP for settings of NORMAL, NORM NO HAND, SERIAL SPEED, and S SPD/NO HAND. A
keypad AUTO or HAND START are required to restart the drive.
• SSTOP for settings of SERIAL AUTO and S AUTO/NO HND. A serial start command is required
to restart the drive.
NOTE - Drive Stop unrelated to Serial Communication
The drive will also be brought to a stop if Drive Parameter #49 (TB13C Input) is changed to or from HAND
(i.e., the HOA is changed from LOCAL to REMOTE or from REMOTE to LOCAL). The specific stop condition
will be dictated by the setting of Drive Parameter #30 (Control).

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N2 Points
4 MCH N2 Points
The MCH N2 Points are divided into four types: analog input, binary input, analog output and binary output.
Sections 4.2 through 4.5 describe each of these point types and the individual point numbers within each.
4.1 Metasys N2 Point Map
Table 2: Metasys N2 Point Map for MCH Series Drives
Point
Type 1
Point
#
COS 2Status
Point 3
Description (Point Name) Point
Units
Decimal
Places
MIN
Value
MAX
Value
Default
Value
1 01 Yes Yes Actual Frequency (OUTPUT FREQ) HZ 2 0 12000 0
1 02 Yes Yes Command Frequency (COMMAND FREQ) HZ 2 0 12000 2000
1 03 Yes Yes Load Percent (LOAD PERCENT) PCT 0 0 255 0
1 04 Yes Yes Total Runtime (RUNTIME HRS) HRS 0 0 65535 0
1 05 Yes Yes DC Bus Voltage (DC BUS VOLTS) PCT 0 0 255 0
1 06 Yes Yes Operational Status (RUN STATUS) -- 0 0 10 3
1 07 Yes Yes H/O/A Mode (HOA MODE) -- 0 0 2 0
1 08 Yes Yes PID Setpoint Command (PID SETPOINT) Note 4 0 Note 4 Note 4 50
1 09 Yes Yes PID Feedback (PID FEEDBACK) Note 4 0 Note 4 Note 4 0
1 10 Yes Yes Present Fault (FAULT) -- 0 0 24 0
2 01 Yes Yes PID Mode (PID MODE) -- -- DIS ENA DIS
2 02 Yes Yes Current Direction (FWD.REV) -- -- FWD REV FWD
2 03 Yes Yes Run/Stop Status (RUN.STOP) -- -- STP RUN STP
2 04 Yes Yes TB-14 / Relay #2 (TB14.RELAY2) -- -- OFF ON OFF
2 05 Yes Yes TB-15 / Relay #3 (TB15.RELAY3) -- -- OFF ON OFF
2 06 Yes Yes Relay #1 (RELAY1) -- -- OFF ON OFF
2 07 Yes Yes Fault Condition (OK.FAULT) -- -- OK FLT OK
2 08 Yes Yes Serial Watchdog (SERIAL WATCHDOG) -- -- ENA DIS ENA
3 01 Yes No Acceleration Rate (ACCEL RATE) SEC 1 0 36000 300
3 02 Yes No Deceleration Rate (DECEL RATE) SEC 1 0 36000 300
3 03 Yes No Speed Source Selection (SOURCE SEL) -- 0 0 2 0
3 04 Yes No Keypad Speed Command (KEY SPD CMD) HZ 2 0 12000 2000
3 05 Yes No Keypad Setpoint Command (KEY STPT CMD) Note 4 0 Note 4 Note 4 50
4 01 Yes No Start/Stop Drive (CMD RUN.STOP) -- -- STP RUN STP
4 02 Yes No Disable Serial Watchdog (DIS SER WATCHDOG) -- -- NRM DIS NRM
4 03 Yes No Clear Present Fault (CLEAR FAULT) -- -- NRM RST NRM
NOTES:
1. Point Types: 1= AI (Analog Input); 2 = BI (Binary Input); 3 = AO (Analog Output); 4 = BO (Binary Output)
2. COS: Change of State
3. Status Points: for monitoring purposes only and cannot be overridden; Yes = Point can be used as a
status point; No = Point cannot be used as a status point.
4. Units, MIN/MAX Values: for this point are defined via Drive Parameters #31, 75 and 76 respectively.
Refer to notes in sections 4.2 and 4.4.

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N2 Points
4.2 Analog Input (AI) Point Descriptions
Point Description
1-01: Actual Frequency
This point represents the actual speed of the drive in Hz.
1-02: Command Frequency
This point represents the commanded drive speed in Hz.
1-03: Load Percent
This point represents the drive’s load current as a % of rated current. This value can also
be seen on the local display.
1-04: Total Runtime
This point represents the number of hours that the drive has been running since its first
power-up.
1-05: DC Bus Voltage
This point represents the drive's DC Bus Voltage as a percentage of the nominal DC bus
voltage.
1-06: Operational Status
This point is for monitoring the actual operating condition of the drive. The value returned
is a number between 0 and 10 which corresponds to one of the following operating states:
Value Operational State
0 FAULT LOCKOUT
1 FAULT
2 START PENDING
3 STOP
4 DC BRAKE
5 RUN AT 0Hz
6 RUN
7 ACCEL
8 DECEL
9 CURRENT LIMIT
10 DECEL OVERRIDE
1-07: H/O/A Mode
This point is for monitoring the drive H/O/A status. If the drive H/O/A is OFF, this point
will return 0 and serial speed/setpoint and serial start commands will not be accepted.
If the drive H/O/A is HAND, this point will return 1 and serial speed/setpoint and serial
start commands will not be accepted. If the drive H/O/A is AUTO, this point will return 2
and, depending on the setting of Drive Parameter #30 (Control), serial speed/setpoint and
serial start commands will be accepted. For more information, refer to Section 3.1 Serial
Communication Setup.

RG-MHMET 8
N2 Points
Point Description
1-08: PID Setpoint Command
This point is for monitoring the commanded PID Setpoint and is displayed in the drive’s
internal PID units with a range of 0-32736. A value of 0 represents the lower of Drive
Parameter #75 (Feedback @ Min) and Drive Parameter #76 (Feedback @ Max). A value
of 32736 represents the higher of Drive Parameter #75 (Feedback @ Min) and Drive
Parameter #76 (Feedback @ Max).
1-09: PID Feedback
This point is for monitoring the current PID Feedback value at the input specified by Drive
Parameter #74 (PID Feedback). It is displayed in the drive’s internal PID units with a range
of 0-32736. A value of 0 represents the lower of Drive Parameter #75 (Feedback @ Min)
and Drive Parameter #76 (Feedback @ Max). A value of 32736 represents the higher of
Drive Parameter #75 (Feedback @ Min) and Drive Parameter #76 (Feedback @ Max).
1-10: Present Fault
This point indicates the type of fault on which the drive is currently tripped. This point returns
a value between 0 and 24 which corresponds to one of the following fault conditions:
Value Fault
0 NO FAULT
1 OUTPUT FAULT
2 E-STOP
3 HIGH DC BUS VOLTS
4 HIGH DRIVE TEMPERATURE
5 THERMAL OVERLOAD
6 OUTPUT FAULT
7 LOW DC BUS VOLTS
8 START ERROR
9 DC BRAKE ERROR
10 FOLLOWER LOSS
11 DB ERROR
12 POWER SAG
13 CONTROL FAULT
14 LANGUAGE
15 EXTERNAL FAULT
16 INTERNAL16
17 POWER TRANSIENT
18 S/W ERROR #1
19 S/W ERROR #2
20 S/W ERROR #3
21 S/W ERROR #4
22 S/W ERROR #5
23 GENERAL S/W ERROR
24 SERIAL COMMUNICATION LOSS

9 RG-MHMET
N2 Points
4.3 Binary Input (BI) Point Descriptions
Point Description
2-01: PID Mode
This point is for monitoring the general state of the drive’s PID mode. If Drive Parameter
#70 (PID Mode) is set to OFF this point returns 0 (DISABLED). If Drive Parameter #70 is set
to either NORMAL or REVERSE, then this point returns 1 (ENABLED).
2-02: Current Direction
This point indicates the direction in which the drive is currently running.
Point Description
2-03: Run / Stop Status
This point indicates whether or not the drive is currently running.
2-04: TB-14 / Relay #2
This point monitors the state of the drive’s TB-14 or Relay #2 output. This point can be
used to indicate various drive conditions as specified by Drive Parameter #52 (TB14/Relay
#2). Refer to the MCH Installation and Operation Manual (MH01) for more information.
2-05: TB-15 / Relay #3
This point monitors the state of the drive’s TB-15 or Relay #3 output. This point can be
used to indicate various drive conditions as specified by Drive Parameter #53 (TB15/Relay
#3). Refer to the MCH Installation and Operation Manual (MH01) for more information.
2-06: Relay #1
This point monitors the state of the drive’s Relay #1 output. This point can be used to
indicate various drive conditions as specified by Drive Parameter #54 (Relay #1). Refer to
the MCH Installation and Operation Manual (MH01) for more information.
2-07: Fault Condition
This point indicates whether or not the drive is currently tripped on a fault. This point
returns 0 (OK) if the drive is not in a fault condition or 1 (FAULT) if it is.
2-08: Serial Watchdog
This point indicates the state of the MCH drive's serial watchdog function. If Drive Parameter
#57 (Serial) is set to WITH TIMER and Point 4-02 is set to NORMAL, then this point returns
a value of 0 (ENABLED). If Drive Parameter #57 (Serial) is set to W/O TIMER or Point 4-02
is set to DISABLE, then this point returns a value of 1 (DISABLED).

RG-MHMET 10
N2 Points
4.4 Analog Output (AO) Point Descriptions
Point Description
3-01: Acceleration Rate
This point sets the time that it will take for the drive to ramp up the motor from 0.00Hz to
the value set in Drive Parameter #18 (Base Frequency). It sets the value in Drive Parameter
8 (Accel Rate). The maximum value for this point is 3600.0 seconds. The minimum value is
either 0.1 sec, 0.3 sec or 0.6 sec depending on the horsepower of the drive. For the actual
minimum boundary, refer to the MCH Installation and Operation Manual (MH01).
3-02: Deceleration Rate
This point sets the time that it will take for the drive to ramp down the motor from the value
set in Drive Parameter #18 (Base Frequency) to 0.00Hz. It sets the value in Drive Parameter
9 (Decel Rate). The maximum value for this point is 3600.0 seconds. The minimum value is
between 0.1 sec and 4.0 sec depending on the voltage rating and horsepower of the drive
as well as the presence of a dynamic brake. For the actual minimum boundary, refer to the
MCH Installation and Operation Manual (MH01).
3-03: Source Select
This point is used to set the HOA reference for the speed or setpoint command.
A setting of NORMAL (0) will cause the drive to use the source that corresponds to the
drive’s current HOA status. If the HOA is HAND (or was HAND prior to an OFF condition),
the drive will follow the source dictated by Drive Parameter #29 (Hand Source). If the HOA
is AUTO (or was AUTO prior to an OFF condition) the drive will follow the source dictated by
Drive Parameter #24 (Auto Source).
A setting of HAND ONLY (1) will cause the drive to use the source dictated by Drive
Parameter #29 (Hand Source) regardless of the drive’s HOA status.
A setting of AUTO ONLY (2) will cause the drive to use the source dictated by Drive
Parameter #24 (Auto Source) regardless of the drive’s HOA status.
One use for this point is to allow the user to toggle between OPEN loop speed control
and CLOSED loop PID control when PID mode is ENABLED (See Point 2-01). The ability to
command this point through the N2 network is dictated by Drive Parameter #30 (Control)
and the drive HOA (See Point 1-07). If this point is not being overridden, this value can also
be set using the SPEED SOURCE and ENTER keys on the drive keypad.
NOTE: If the SPEED SOURCE key on the drive keypad is currently changing the source
selection, serial override commands of this point will not be accepted.
3-04: Keypad Speed Command
This point monitors and controls the Keypad Speed Command. The ability to command this
point through the N2 Network is dictated by the setting of Drive Parameter #30 (Control) and
the drive’s current H/O/A Mode (Refer to Point 3-03). If this point is not being overridden,
this value can also be set using the drive’s MOP function or the UP and DOWN arrow keys
on the drive keypad.
NOTE: If the MOP function or the drive keypad is currently changing the keypad speed
command, serial override commands of this point will not be accepted.

11 RG-MHMET
N2 Points
Point Description
3-05: Keypad Setpoint Command
This point monitors and controls the Keypad Setpoint Command. The units for this point
are defined by Drive Parameter #31 (Units). The minimum and maximum values for this
point are defined by Drive Parameter #75 (Feedback @ Min) and #76 (Feedback @ Max),
respectively. The range of adjustment for Drive Parameters #75 and 76 is –32768 to
32767.
The ability to command this point through the N2 network is dictated by Drive Parameter
#30 (Control) and the drive HOA (Refer to Point 3-03). If this point is not being overridden,
this value can also be set using the drive’s MOP function or the UP and DOWN arrow keys
on the drive keypad.
NOTE: If the MOP function or the drive keypad is currently changing the keypad setpoint
command, serial override commands of this point will not be accepted.
4.5 Binary Output (BO) Point Descriptions
Point Description
4-01: Start/Stop Drive
This point reflects the last serial START/STOP command that was issued to the drive.
4-02: Disable Serial Watchdog
This point is used to disable the drive's serial watchdog function. If this point is set to
NORMAL, then the serial watchdog will be enabled or disabled depending upon the setting
of Drive Parameter #57 (Serial). If this point is set to DISABLE then the serial watchdog is
DISABLED.
4-03: Clear Present Fault
This point is used to clear the current fault via the serial link. Set this point to RESET (1)
to clear the present fault. Once the fault has been cleared, the value of this point will
automatically return to NORMAL (0).
4.6 Reference and Links
MCH Series Variable Frequency Drives visit:
http://www.lenze-actech.com
Metasys N2 and Johnson Controls, Inc. visit:
http://www.johnsoncontrols.com/publish/us/en/products/building_efficiency/building_
management/metasys.html

Lenze AC Tech Corporation
630 Douglas Street • Uxbridge MA 01569 • USA
Sales: 800-217-9100 •Service: 508-278-9100
www.lenze-actech.com
RG-MHMET-e6