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MCH Series drive (AC Tech, BACnet MS/TP)

Variable frequency drive · BACnet points list

Lenze MCH Series drive (AC Tech, BACnet MS/TP) BACnet points list

Updated 7 November 2026Unofficial source

Short answer

The MCH Series is an older Lenze AC Tech HVAC drive. The BACnet version talks BACnet MS/TP as a slave device at 9600 baud, so the BMS must bind to it statically. It has a small fixed object set: speed and PID setpoint commands, run/stop, fault reset, and status and fault readbacks.

This page lists 23 BACnet objects for the Lenze MCH Series drive (AC Tech, BACnet MS/TP) — 5 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from a copy of Lenze’s documentation hosted by Internet Archive (manualzilla collection), not by Lenze itself, so treat it as unofficial.

Manufacturer: Lenze
Model: MCH Series drive (AC Tech, BACnet MS/TP)
Equipment: Variable frequency drive
Equipment type: VFDs & pumps
BACnet objects: 23 (5 writable)
Transport: BACnet MS/TP
Firmware: Not stated
Default device instance: 1240000
Also known as: AC Tech MCH, Lenze AC Tech MCH, MCH Series BACnet, RG-MHBAC
Source document: MCH Series Drives BACnet Communications Guide · RG-MHBAC-e2 · rev. 2003 (unofficial copy, hosted by Internet Archive (manualzilla collection))

Download CSV 23 rows Download EDE B.I.G.-EU JSON Source PDF (unofficial copy) ↗ Compare with your scan Download Easy BACnet Mobile App Google Play

Reference only, provided as-is: verify against Lenze’s current documentation and the live device before use. Not official Lenze information. Terms of use.

BMS integration notes: Lenze MCH Series drive (AC Tech, BACnet MS/TP)

Integration in brief

Leave parameter 57 Serial at WITH TIMER, give the drive a MAC address and device number, keep parameter 24 Auto Source at KEYPAD and set parameter 30 Control to SERIAL AUTO (or S AUTO/NO HND). With the H/O/A in AUTO the BMS can then start the drive with BO 1 and set speed with AV 1 (or the PID setpoint with AV 2).

Minimum points to map

The short list most integrators start with — enough to run the unit from a BMS. Map more as the job needs.

Object	Name	Why	Access
BO 1	CMD RUN_STOP	Start/stop command	Command
AV 1	KEY SPD CMD	Speed command, Hz	Write
BV 1	CLEAR FAULT	Fault reset; write CLR then NRM	Write
BI 1	RUN_STOP	Run status	Read
AI 1	OUTPUT FREQ	Output frequency, Hz	Read
MI 4	HOA MODE	Must be AUTO for LAN commands	Read
BI 3	OK_FAULT	Drive fault	Read
MI 2	FAULT	Present fault code	Read

Enable & remote start

Parameter 57 Serial must be WITH TIMER or W/O TIMER and parameter 24 Auto Source must be KEYPAD. Parameter 30 Control sets what the LAN may do: SERIAL SPEED allows speed/setpoint only, SERIAL AUTO or S AUTO/NO HND also allows start. The H/O/A must be in AUTO; in OFF or HAND the drive ignores LAN start and speed commands. LAN stop commands are always accepted.

Heartbeat & communication loss

With parameter 57 = WITH TIMER, a serial watchdog (parameter 60, 10-65535 s, default 30 s) takes the drive out of serial control if the LAN stops talking; in SERIAL AUTO a running drive trips on SERIAL FAULT. Set parameter 57 to W/O TIMER to disable it.

Network setup

MAC address: parameter 58, default 128 (0-254).
Baud rate is fixed at 9600.
Device instance: parameters 85 and 86, default 1240000.

Watch out for

MS/TP slave only: the BMS must use static binding.
BV 1 must go back to NRM before another fault clear is accepted.
Once the LAN writes AV 1 the keypad cannot change speed until H/O/A is toggled to HAND or OFF.
LAN speed control needs MI 5 in state 1, 9 or 10; LAN setpoint control needs state 11 or 19.
The drive does not accept start commands from the LAN while in programming mode, and the display must show SSTOP for a LAN start to work.

Lenze MCH Series drive (AC Tech, BACnet MS/TP) BACnet objects

Type: AI, AO, AV, BI, BO, BV, MI/MO/MV (multi-state) · Access: Read read-only, Write writable, Command writable with a priority array.

Note: the source document has no read/write column, so access here is inferred from the object type (inputs read-only, values writable). Confirm on the live controller before writing.

23 of 23 shown

Type

Access

Units

Show

Lenze MCH Series drive (AC Tech, BACnet MS/TP) BACnet Points List
			Description			States
AImin	1	OUTPUT FREQ	Actual output frequency	Hz	Read
AI	2	COMMAND FREQ	Commanded frequency	Hz	Read
AI	3	LOAD PERCENT	Load current, % of rated	%	Read
AI	4	RUNTIME HRS	Total runtime hours	h	Read
AI	5	DC BUS VOLTS	DC bus voltage, % of nominal	%	Read
AI	6	PID SETPOINT	Commanded PID setpoint	%	Read
AI	7	PID FEEDBACK	PID feedback value	%	Read
AVmin	1	KEY SPD CMD	Keypad speed command (LAN writable)	Hz	Write
AV	2	KEY STPT CMD	Keypad PID setpoint command (LAN writable)	%	Write
BImin	1	RUN_STOP	Run/stop status		Read	Inactive=STP, Active=RUN
BI	2	DIRECTION	Current direction		Read	Inactive=FWD, Active=REV
BImin	3	OK_FAULT	Fault condition		Read	Inactive=OK, Active=FLT
BI	4	TB14_RELAY2	TB-14 / relay 2 output state		Read	Inactive=OFF, Active=ON
BI	5	TB15_RELAY3	TB-15 / relay 3 output state		Read	Inactive=OFF, Active=ON
BI	6	RELAY1	Relay 1 output state		Read	Inactive=OFF, Active=ON
BOmin	1	CMD RUN_STOP	Start/stop command (priority array)		Command	Inactive=STP, Active=RUN
BVmin	1	CLEAR FAULT	Clear present fault		Write	Inactive=NRM, Active=CLR
MI	1	RUN STATUS	Operational status		Read	1=LOCK, 2=FAULT, 3=PEND, 4=STOP, 5=BRAKE, 6=RUN@0, 7=RUN, 8=ACCEL, 9=DECEL, 10=LIMIT, 11=F DEC, 12=INVAL, 13=KSTOP, 14=KSTOP, 15=RSTOP, 16=SSTOP
MImin	2	FAULT	Present fault		Read	1=NO FAULT, 2=OUTPUT, 3=E-STOP, 4=HI VOLTS, 5=HI TEMP, 6=OVERLOAD, 7=OUTPUT, 8=LO VOLTS, 9=START ER, 10=BRAKE ER, 11=FOLLOWER, 12=DB ERROR, 13=PWR SAG, 14=CONTROL, 15=LANGUAGE, 16=EXTERNAL, 17=INTERNAL16, 18=PWR TRAN, 19=INTERNAL18, 20=INTERNAL19, 21=INTERNAL20, 22=INTERNAL21, 23=INTERNAL22, 24=INTERNAL23, 25=SERIAL
MI	3	PID MODE	PID mode		Read	1=OFF, 2=NORMAL, 3=REVERSE
MImin	4	HOA MODE	Hand/Off/Auto mode		Read	1=OFF, 2=HAND, 3=AUTO
MI	5	SPD_STPT REF	Active speed/setpoint reference source		Read	1=-KEY, 2=-VDC, 3=-IDC, 4=SP#1, 5=SP#2, 6=SP#3, 7=SP#4, 8=-MOP, 9=-SER, 10=-MKB, 11=-AKB, 12=-VDC, 13=-IDC, 14=SP#1, 15=SP#2, 16=SP#3, 17=SP#4, 18=-MOP, 19=-SER
MV	1	SOURCE SEL	Speed source selection		Write	1=NORMAL, 2=HAND, 3=AUTO

Object ID lookup: Lenze MCH Series drive point IDs by name

AI1OUTPUT FREQ
AI2COMMAND FREQ
AI3LOAD PERCENT
AI4RUNTIME HRS
AI5DC BUS VOLTS
AI6PID SETPOINT
AI7PID FEEDBACK
AV1KEY SPD CMD
AV2KEY STPT CMD
BI1RUN_STOP
BI2DIRECTION
BI3OK_FAULT
BI4TB14_RELAY2
BI5TB15_RELAY3
BI6RELAY1
BO1CMD RUN_STOP
BV1CLEAR FAULT
MI1RUN STATUS
MI2FAULT
MI3PID MODE
MI4HOA MODE
MI5SPD_STPT REF
MV1SOURCE SEL

Integration notes

The drive is an MS/TP slave, so only BMS devices that support static device binding can reach it.
Default MAC address is 128 (parameter 58, range 0-254); baud rate is fixed at 9600.
Device instance is set with parameters 85 (bits 16-22) and 86 (bits 0-15); default 1240000.
Object names are the short names printed in brackets in the object map; the access column is inferred from object type and the object descriptions.

Check it against the live device. A points list tells you what the controller can expose; the unit in front of you may differ by firmware or installed options. This list is provided as-is for reference only and may contain mistakes — confirming it before you write, map or commission anything is up to you (terms). Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the MCH Series drive (AC Tech, BACnet MS/TP) and exports what it actually has to Excel — free. New to BACnet? Start with what a BACnet points list is and what the object types mean.

Questions about the Lenze MCH Series drive (AC Tech, BACnet MS/TP)

How many BACnet points does the Lenze MCH Series drive (AC Tech, BACnet MS/TP) have?

This list has 23 BACnet objects: 7 analog inputs, 2 analog values, 6 binary inputs, 1 binary output, 1 binary value, 5 multi-state inputs, 1 multi-state value. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Lenze MCH Series drive (AC Tech, BACnet MS/TP) BACnet points are writable?

5 of the 23 objects accept a write. Points marked Command have a priority array: a write holds until it is released, so release it back to automatic when you are done. The source has no read/write column, so this is inferred from object type.

Where is the official Lenze MCH Series drive (AC Tech, BACnet MS/TP) BACnet documentation?

Lenze does not publish it on its own website. This list comes from MCH Series Drives BACnet Communications Guide (RG-MHBAC-e2), revision 2003, a copy hosted by Internet Archive (manualzilla collection) at https://archive.org/download/manualzilla-id-5789887/5789887.pdf. Ask Lenze or its representative for the current revision.

What are the minimum BACnet points to integrate the Lenze MCH Series drive (AC Tech, BACnet MS/TP)?

Start with BO 1 CMD RUN_STOP (Start/stop command); AV 1 KEY SPD CMD (Speed command, Hz); BV 1 CLEAR FAULT (Fault reset; write CLR then NRM); BI 1 RUN_STOP (Run status); AI 1 OUTPUT FREQ (Output frequency, Hz); MI 4 HOA MODE (Must be AUTO for LAN commands); BI 3 OK_FAULT (Drive fault); MI 2 FAULT (Present fault code).

How do I enable BMS control of the Lenze MCH Series drive (AC Tech, BACnet MS/TP)?

Does the Lenze MCH Series drive (AC Tech, BACnet MS/TP) need a BACnet heartbeat or have a communication timeout?

How do I check these points on the real MCH Series drive (AC Tech, BACnet MS/TP)?

Scan the network with a BACnet IP browser such as Easy BACnet, open the device and compare its object list with this table. Anything missing is usually an option that isn't installed or a point that is disabled in the controller's configuration.

More Lenze BACnet points lists

Variable frequency drive
Lenze i500 inverter (BACnet MS/TP)
Lenze i500 series inverters (model I51AExxxx10xxxxxxS) with the BACnet MS/TP network option, firmware V01.04.
77 objects · 34 writable · PICS V01.04
Also known as: i500, Lenze i500, i510, i550, I51AE, Lenze i500 BACnet

Source: MCH Series Drives BACnet Communications Guide · RG-MHBAC-e2 · rev. 2003. Object names, instances and units are reproduced as published; descriptions are our own.