Emerson COPELAND EVA3 Manual

© 2023Emerson Climate Technologies, Inc.
Emerson Classification:Internal
1
AE8-1435 March 2023
EVA3 Single Phase Series Variable Speed Drives
208-240VAC, 4.2kW & 7.1kW
TABLE OF CONTENTS
SAFETY INSTRUCTIONS.....................................2
Important Safety Information...............................2
QUALIFIED PERSONNEL ONLY.....................2
ELECTRICAL SHOCK HAZARD......................2
FIRE HAZARD –USE WITH FLAMMABLE
REFRIGERANTS ..........................................2
Signal Word Definition......................................3
INTRODUCTION..................................................3
Product Description...........................................3
Theoryof Drive Operation..................................3
Agency Recognition...........................................3
Nomenclature...................................................3
INSTALLATION...................................................3
Drive Handling..................................................3
Handle and store the drive correctlyto prevent
damage...........................................................3
Mounting..........................................................3
Drive Accessories and Dimensions......................4
Wiring Diagram.................................................4
OPERATION & FUNCTION...................................4
Hi-pot Procedure/ Set-up...................................4
Temperature, Humidity and Altitude.....................4
Pre-operation Checks........................................4
Power On/Off...................................................4
Communication Setting......................................4
Physical Layer..................................................4
Data Link Layer ................................................4
Application Layer..............................................4
Input Voltage and Input Current...........................6
Compressor & Fan Motor Speed Control..............6
Start-up ...........................................................6
Shutdown........................................................7
Fault Clearing...................................................7
Lockout Faults..................................................7
Stator Heat Control...........................................7
Status Indication...............................................7
Power Interrupt.................................................7
Drive Configuration...........................................7
High Pressure Cut Out.......................................7
Drive Cooling ...................................................8
Drive Over Temperature Protection.....................8
Air Cooled Heat Exchanger................................8
Foldback.........................................................8
Troubleshooting................................................8
EMCGuidelines:...............................................8
Table 1 –J7 (RS485) Communication ConnectorPin
Definition....................................................... 11
Table 2 –Sensor ConnectorPinDefinition.......... 12
Table 3 –J8 Fan Motor Connector PinDefinition. 12
CompressorStart-up and ShutdownProfile........14
Drive Foldback Information................................16
Modbus Map......................................................21
Drive Configuration Flowcharts..........................47
Troubleshooting Guide......................................53
Hi-pot Testing....................................................63
Accessories......................................................64

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© 2023Emerson Climate Technologies, Inc.
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SAFETYINSTRUCTIONS
This bulletin includes importantsafetyinformation.OEMs integrating the Copeland Scroll™ variable speed drive into
a system should ensure that their own employeesfollow thisbulletin and provide any necessary safety information
to thoseinvolved in manufacturing/installing the drive, purchasers of systems, and service personnel who may need
to maintain and repair the systems.
Important Safety Information
Failure to followthese warningscould resultinseriouspersonal injuryor death.
QUALIFIED PERSONNEL ONLY
•OEMs are responsible forsystem design, selection of appropriate components,integration of this componentinto
the system, and testing the system. OEMs must ensure that staff involved in these activities are competentand
qualified.
•OEMs are also responsible forensuring that all product, service and cautionary labels remain visible orare
appropriately added in a conspicuouslocation on the systemto ensure they are clearto anypersonnel involved
in the installation, commissioning,troubleshooting or maintenance of this equipment.
•Only qualified and authorized HVAC or refrigeration personnel are permitted to install, commission,troubleshoot
and maintain this equipment. Electrical connections must be made by qualified electricalpersonnel.
•Observe all applicable standards and codes for installing, servicing, and maintaining electrical and
refrigeration equipment.
ELECTRICAL SHOCK HAZARD
•Before servicing,disconnectand lockout power,and discharge all capacitors for a minimum of two minutes.
•Molded electrical plug mustbe used where required.
FIRE HAZARD –USE WITH FLAMMABLE REFRIGERANTS
•This drive can be used in systemscontaining flammablerefrigerants (as perA2L and A3 refrigerant
complianceguidelines).If flammablerefrigerantisreleasedorleaksfromasystem,anexplosiveconcentration
can be present in the air near the system. If there is an ignition source nearby, a release of flammable
refrigerantcanresultinafireorexplosion.Whilesystemsusingflammablerefrigerantaredesignedto mitigate
theriskof ignitioniftherefrigerantisreleased,fireandexplosioncanstilloccur. Personnelmustbespecifically
trained on safeprocedures for working with flammable refrigerants. See Climate.Emerson.com/flammable for
information on flammable refrigerant safety and training.
•Some flammable refrigerants do not have an odorant, so leaks cannot be identified by smell. Use a
combustible gasmonitordesigned to detect flammable refrigerants.Keep the monitor on at all times during
service. (Note:Since flammable refrigerants are heavier than air, place the monitor at a low level for accurate
detection.) If flammable gases are detected,cease servicing the systemuntil the source of the gases can be
determined and mitigated.

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Signal Word Definition
The signal word explained below is used throughout the document to indicate safety messages.
WARNING indicatesa hazardous situation which,if not avoided, could resultin
death or serious injury.
INTRODUCTION
Product Description
The inverter drive has been developed specifically for
variable speed compressors and condenser fans
utilizing flammable (A2L and A3) & non-flammable
refrigerants. The drive will power the compressor;
control the compressor and the fan running speed;
provide compressor, fan and drive protection and
communicate with the master controller. The drive
requires cooling and is typically installed in a system
nearthe compressor.
Theory of Drive Operation
The primary purpose of the drive isto convert the 50/60
Hz AC input voltage into a variable frequency, variable
voltage output to power the variable speed scroll
compressor. The drive conditions the AC input voltage
through a series of conditioning processes to arrive at
the desired output. The drive first converts the AC input
voltageintoaDCvoltage.TheDCvoltageisthenpulse-
width modulated to replicate a sinusoidalcurrent at the
desired frequencyand voltage.
Agency Recognition
UL 60730-1, IEC 60335-1, IEC 60335-2-34
Nomenclature
The modelnumberofthedriveincludesthepowerrating
and nominal voltage input to the drive. See
Applications Engineering fora complete explanation
of the alpha and numeric characters in the drive model
number.
INSTALLATION
Drive Handling
Handle and store the drive correctly to prevent
damage.
•Never cut across the drive with anything sharp.
Do not use a sharp bladeto open the protection
bag.
•Hold the drive only by the tray or edges of the
heatsink. Do not hold by the components on the
drive or drive accessories.
•Once opened do not stack the drives on each
other.
•Use electrostatic discharge control wristbands
and anti-static mats when touching the drive.
•Torque all screw terminals to 18-20 lb-in (2.0-3
N-m) to prevent anydamage to the drive.
Mounting
The drive should be located as close to the compressor
and the fan motor as possible, preferably within 5 feet.
This is important because the wiring between the drive,
compressorand fanmotorisunshielded.
Air-cooleddrivesaresupportedinsidetheHVACsystem
by an extended heatsink plate. The plate mounts
throughanopeninginthecabinetsheetmetaltoexpose
the heatsink to the condenser fan air stream. The flange
containsagasketsurfacetopreventwaterfromentering
the electronics side of the control box.
The flat plate option accommodates installation to
systems using the mating gas or liquid cooled cold plate
heat exchanger. The cold coupling plate is designed by
OEM to accommodate the systemdesign.
There are holes in the drive mounting flange for
mounting purposes. These holes will accommodate an
M5 sized screw for mounting.
WARNING
These commodities, technology or software, are subject to the U.S. ExportAdministration Regulations(EAR).
Diversion contrary to U.S. lawis prohibited.ECCN:EAR99

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Drive Accessories and Dimensions
Referto Addendum foraccessories.Contact
Application Engineering for detailed dimensionswith
tolerance and drawings.
Wiring Diagram
Referto Figure 1 for a detailed description of the drive
wiring diagrams.Referto Table 1 and Table 2 for a
detailed description of theconnectorpin definition.
OPERATION & FUNCTION
Hi-pot Procedure / Set-up
Referto Addendum for hi-potprocedure and setup.
Please call your Application Engineer for additional
details.
Temperature, Humidity and Altitude
Drive operating temperature range: -20°Cto 60°C
Full Performance temperature range: -20°C to 55°C
Drive storage temperature range:-40°Cto 85°C
Humidity: Maximum relative humidity 95%
The drive is designed to meetcreepage and clearance
requirements fora maximumaltitude of 2000 meters.
The storage/shelf life of the drives are 6-12 months
without powering them.
Pre-operation Checks
Before operating, make sure that all the wires are
correctly and tightly connected. Improper
connections may cause fire or electric shock,or
explosion in systems containing flammable
refrigerants.
Power On/Off
The drive should use rated AC powersupply:
50/60Hz,208~240V. Use ofincorrect powersupply
may damage the drive.
When powering off the drive,wait forat least 2 minutes
to ensure that the drive iscompletely turned off.
CommunicationSetting
The drive is designed to be used in a master-slave
configuration where the drive acts as the slave device.
The drive can operate on a buscontaining multiple
slave devices.
The default baud rate is 19200. The default
communication settings are 8,1 and even.Modbus
communication settings are configurable, see the
ModbusMap section in the Addendum foradditional
details.
Physical Layer
The physical layer defines the hardware interface to
the master. The standard control interface uses a two-
wire serial communication (RS485 physicallayer)
scheme. The recommended cable is a 22 AWG
stranded copperwith 3 conductors(A, B, GND) and a
drain wire. The mating JSTplug partnumber to plug
into J7is JSTP/NPAP-04V-S.
Data Link Layer
The data link layer defines the reliable transferof a
message transferred fromthe master to one of the
slave devicesand the reliable transfer of the response
message back to the master.The drive only supports
ModbusRTU, with thedefault nodeaddressof 45
(0x2D).
The character framing will bea 11-bit characteras
follows:
•1 Start bit
•8 Data bits
•1 Parity bit
•1 Stop bit
Application Layer
The application layer defines the type of message that
will be sent and the format of the message. The drive
supports the following functions codes:
- Read Holding Registers (0x03)
- Write Holding Register (0x06)
- Write Multiple Holding Registers (0x10)
- Special Function (0x64)
Read Holding Registers
This function is used to read data from one or more
consecutive registers.
WARNING

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Request
Function code
1 Byte
0x03
Starting Address
2 Bytes
0x0000 to
0xFFFF
Quantity of Registers
2 Bytes
1 to 24 (0x18)
Response
Function code
1 Byte
0x03
Byte count
1 Byte
2 x *N
Holding Registers
*N x 2
Bytes
Register Data
*N= Quantity of Input Registers(N<=24)
Error
Error code
1 Byte
0x83
Exception code
1 Byte
0x01
0x02
0x03
0x04
0x01 = Unsupported Function Code
0x02 = Invalid Register Address
0x03 = Quantity of RegistersOut of Range
0x04 = Read of RegisterFailed.This will occurif the
incorrect access levelpassword was applied in register
200.
Write Holding Register
This function code is used to write data to a single
register.
Request
Function code
1 Byte
0x06
Register Address
2 Bytes
0x0000 to
0xFFFF
Register Value
2 Bytes
0x0000 to
0xFFFF
Response
Function code
1 Byte
0x06
Register Address
2 Bytes
0x0000 to
0xFFFF
Register Value
2 Bytes
0x0000 to
0xFFFF
Error
Error code
1 Byte
0x86
Exception code
1 Byte
0x01
0x02
0x03
0x04
0x01 = Unsupported Function Code
0x02 = Invalid RegisterAddress
0x03 = Register Value Outside Specified Range
0x04 = RegisterWrite Failed. This willoccur if the
incorrect access levelpassword was applied in register
200.
Write Multiple Holding Registers
This function is used to write too multiple consecutive
registers.
Request
Function code
1 Byte
0x10
Starting Address
2 Bytes
0x0000 to
0xFFFF
Quantity of Registers
2 Bytes
0x0000 to
0x007B
Byte Count
1 Byte
2 x *N
Register Values
*N x 2
Bytes
0x0000 to
0xFFFF

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*N= Quantity of Registers
Response
Function code
1 Byte
0x10
Starting Address
2 Bytes
0x0000 to
0xFFFF
Quantity of Registers
2 Bytes
0x0000 to
0x007B
Error
Error code
1 Byte
0x90
Exception code
1 Byte
0x01
0x02
0x03
0x04
0x01 = Unsupported Function Code
0x02 = Invalid RegisterAddress
0x03 = Register Value Outside Specified Range
0x04 = RegisterWrite Failed. This willoccurif the
incorrect access levelpassword was applied in register
200.
Minimum Communication Requirement
If no Modbuscommunication is received by the drive
for 30 secondsthe drive will issue a Modbus
CommunicationsLost error. Abest practice isto
provide a “heartbeat” signal every 100ms. An example
of thiswould be a read command of drive status
register#5 every 100ms. Bit #2 will give you the status
of thedrive.0: Ok | 1: Faulted
Special Function
This function is used to performspecial functionson
the drive. See the ModbusMap section in the
Addendum foradditionaldetails.
Input Voltage and Input Current
The drives are designed for an input power supply of
208 to 240volts50/60Hz. Publishedperformanceof the
drive and compressor combination will have a
performance tolerance specified on the compressor
performance data sheet when the drive inputvoltage is
in the range of 208 to 240 volts.
Drive
Max AC InputCurrent
EVA3042B
18.5A RMS
EVA3071B
31.0A RMS
Power Factor Correction
The drive incorporates active power factor correction.
There are3 states of powerfactorcorrection,off,partial,
and on. The drive will automatically switch between the
various states in order to maximize system efficiency.
Contact Application Engineering foradditionaldetails.
Compressor & Fan Motor Speed Control
The EVA3 drive controls both the compressor &
condensing fan speed. Both speeds are controlled by
writing the speed demand to the appropriate Modbus
register. The compressor and fan may be operated
independentofeachother.Themaximumandminimum
allowed speeds for the compressor can be read from
registers 3 & 4 respectively. These speeds may vary
based upon the selected compressor. Similarly, the
maximumand minimumallowedspeedsfortheselected
condensingfancanberead fromregisters1003&1004.
Start-up
The drive will not start with faults present. Modbus
registers 78 through 85, and 1078 to 1081 should all be
equal to 0, thiscanalso be verified bychecking register
5, bit 2. To clearfaults,seethe Fault Clearingsection.
Use the steps below in order to start the compressor /
condensing fan.
1. Enable drive by writing '1' to Modbus register
100.
2. Write compressor target RPM to Modbus
register101.
3. Write the fan target RPM to register 1101 (if
applicable).
Start-up control is divided into 3 stages. For a detailed
description, referto Addendum for start-up procedures
and requirements. After successful start-up, the
compressor and fanwill run at the demanded speed.
The condenser fan to be always started first before
compressor start-up. Register 1005, bit-8 can be
monitored to ensure condenser fan has reached
demanded speed before starting the compressor.

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Shutdown
The compressor/ fanwill shut downwhencommanded
to do so, or when a fault occurs. Any faultthat occurs
will shut down both the compressor and fan.There are
two typesof shut down, immediate andcontrolled.
Controlled Shut Down:A controlled shut down is when
power is still applied to the compressor/ fan, while de-
accelerating to a complete stop. Once stopped, power
is removed. Demanding a speed of zero, while keeping
the drive enabled, will resultin a controlled shutdown.
ImmediateShutDown:Animmediateshutdowniswhen
power is completely removed fromthe compressor / fan
instantly regardlessofcurrentspeed. Disablingthedrive
while running, will result in an immediate shut down.
When commanding the compressor/ fan to stop under
normal running conditions, the controlled shutdown
method should be used. Refer to Addendum to see
which shutdown is used for each fault.
Fault Clearing
Faults will not clear unless theyare commanded to do
so. The following stepsare required to clear the faults:
1. The compressor/ fanhas been shut downfor at
least 35 seconds.
2. The fault conditionno longerexists.
3. Set the compressor and fan speed demand to 0
(registers 101 & 1101).
4. Disable the drive (register 100).
5. Send the clear faults command (register 103).
Reading register 5, bit2, can be used to verify the fault
clearing attempt was successful.
Lockout Faults
There are specific faults that will cause the drive to
'lockout' after 10 of these faults occur in a 10-hour
window. These faults are noted in the Addendum.
Once the drive has locked out, the lockout fault will be
set. The drive mustbe power cycled to clear the
lockout fault.
Stator Heat Control
The EVA3 drive supports a stator heating control
feature, where the drive can be commanded to deliver
DC power to the compressor.In cool environments the
system may wish to preheat the compressor prior to
running. In order to run the drive-in stator heating mode,
follow the stepsbelow:
1) Clear active faults
2) Set compressor speed to 0
a. Note that the compressor speed
demand takeshigherpriorityoverstator
heat. If a speed demand is provided,
the drive will run the compressor and
ignore the stator heat command.
3) Enable the drive
4) Set desired statorheating power
In order to stop stator heating, demand a power of 0W,
after this a speed demand can be provided to run the
compressor.
Status Indication
There are two LEDs on the drive board; one is LED1
and is used for drivediagnostics,anotherLED is D56
which is used for indicating power status of Modbus
communication circuit.
Power Interrupt
Powerinterruptscanresultinadrivetripthatwon'tharm
the drive. The drive can withstand interrupts of a short
duration (<=10 ms).
Drive Configuration
The EVA3 drive has multiple parameters that can be
configured. Some of these parameters include
communication settings, ramp rates, compressor
selection, condensing fan motor selection,and sensor
selection. Referto the Addendum for the complete list
of configurable parameters and detailsregarding drive
configuration.
High Pressure Cut Out
The high pressure cut out connection (J6) is a 2-pin
connector, supporting a normally closed pressure
switch. To ensure correct functionality of the high-
pressure switch,for the system’s lifetime, typically gold-
plated contactsare recommended.Refer to Table-2 for
detailed pinout.
The high-pressure cutout port is hardware Protected
Electronic Circuit (PEC)according to IEC 60335-1 and
software is Class-B.

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Drive Cooling
Because of the power electronicsused in the drive and
theassociatedheatgeneration,drivecoolingisrequired
to keep the drive components in their designed
temperature range.The allowable temperature range of
the drive (the ambient air surrounding the drive) -20°C
to 60°C. Drive temperature should be monitored during
system development at system extreme conditions to
ensure that the maximum allowable drive temperature
isn’t exceeded. The highest drive temperature will
typicallyoccurduringhighloadconditionsorduringhigh
ambient.
Drive Over Temperature Protection
The drive is self-protected against high internal
temperatures. For overtemperature / temperature high
faults refer to Troubleshooting Table within
Addendum.
Air Cooled Heat Exchanger
Drives cooled by the aluminum air cooled heat
exchanger are designed to be in the air flow streamof
the condenser. The air-cooled heat exchangermustbe
installed so that the heat exchanger fins are parallel to
the cooling air flow.The airflow must be a minimumof 3
meters/sec measured at the outletof the heatsinkin the
direction of the airflow.
Foldback
To protect the drive components and the compressor;
the compressor speed will 'foldback' or slow down to
help reduce risk to components.The foldback event(s)
will be flagged in the drive's Modbus registers.This will
allow the operating systemto respond and mitigate the
conditionscausing foldback.
For further information referto Addendum.
Troubleshooting
The drive may indicate a fault or protection forvarious
reasons. If a fault or protection occurs, users should
powerdownthe drive, check thedrive, and check the
drive running condition carefully. For the description,
check and handlingofthesefaultsorprotections,please
referto the Troubleshooting–Fault and Protection
within Addendum
EMC Guidelines:
Install the star earth (ground) connection as close as
possible to the drive. A non-coating screw is
recommended for installation on the service panel to
maintainagoodgroundconnection.Thestarconnection
includes:
•System Input ground
•Drive Heat-sinkground

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EMI Ferrite Rings
Any of the input power supply cables, sensorcables, compressor cables and communication cablesshould not
cross or touch each other to avoid noise coupling.
Use of shielded cable is optional depending on system application, but if used it’s mandatory to have correct
connections on both sides ofthe cable.
The use of additionalferrites and numbers of turns in the input power supply cables, compressor cables,sensor
cables, aluminumshielding enclosure are optional butpreferred based on system application and noiselevel.
EVA3 4.2kW ferrite solution.
No.
Cable
Manufacturer
Partnumber
Turns
Windingmethod
Other requirement
1
Input cable
MagneticsInc
ZW44925TC
8
Differential
2
Compressoroutput
MagneticsInc
ZW44925TC
4
Parallel
3
Fan output + Fan
ground
MagneticsInc
ZW44925TC
4
Differential
Fan output separate fromfan
ground
4
RS-485
Feelux
G5A-TR36-23-15
3
Parallel
Shielded cable followEV2
EVA3 7.1kW ferrite solution.
No.
Cable
Manufacturer
Partnumber
Turns
Windingmethod
Other requirement
1
Input cable
MagneticsInc
ZW44925TC
7
Differential
2
Compressoroutput
MagneticsInc
ZW44925TC
5
Parallel
3
Fan output
MagneticsInc
ZW44925TC
6
Parallel
4
RS-485
Feelux
G5A-TR36-23-15
3
Parallel
Shielded cable followEV2

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Figure 1 –4.2kW Drive Wiring Diagram

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Figure 2 –7.1kW Drive Wiring Diagram
Table 1 –J7 (RS485)Communication Connector Pin Definition
Pin
Number
Description
Figure
1
Not Connected
2
B
3
A
4
GND
Description
Part Number
4-Pin ConnectorHeader
JSTP/N B04B-PASK-1 or Equivalent

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Table 2 –Sensor Connector PinDefinition
Pin
Number
Description
Figure
1
DLT1
2
DLT2
1
HP1
2
HP2
J5 (DLT Sensor) Connector P/N Information
Description
Part Number
2-Pin ConnectorHeader
JSTP/NB02B-PASK-1 or Equivalent
J6 (HPS) Connector P/N Information
Description
Part Number
2-Pin ConnectorHeader
JSTP/N B2P-VH-FB-B orEquivalent
Table 3 –J8 Fan Motor Connector Pin Definition
Pin
Number
Description
Figure
1
Fan U
2
Fan V
3
Fan W
Description
Part Number
3-Pin ConnectorHeader
TE P/N 1-1123723-3 or Equivalent
The contents of this publication are presented for informational purposesonly and are not to be construed as warranties or guarantees, express or implied, regarding
the products or services described herein or their use or applicability.Emerson Climate Technologies, Inc. and/or its affiliates (collectively "Emerson"),as applicable,
reserve the right to modifythe design or specifications of such productsat any timewithout notice.Emerson does not assume responsibilityfor the selection,use or
maintenance of any product.Responsibility forproper selection, use and maintenance ofany Emersonproduct remains solelywiththe purchaser or end user.

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TABLE OF CONTENTS
CompressorStart-up and ShutdownProfile.......................................................................14
Drive Foldback Information ..............................................................................................16
Modbus Map....................................................................................................................21
Drive Configuration Flowcharts........................................................................................47
Troubleshooting Guide.....................................................................................................53
Hi-pot Testing..................................................................................................................63
Accessories....................................................................................................................64
ADDENDUM to AE8-1435 March 2023

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Compressor Start-up and Shutdown Profile
The EVA3 drives incorporate a specific startup profile whenstarting the compressor.Thisprofile is
configurable,see the Drive Configurationsectionfor more details.Figure 1 and Table 1 correspond to the
compressor startup profile, while Figure 2 and Table 2 correspond to the compressor shutdown profile.
Table 1 –Compressor Startup Sequence
Stage
Description
Target Speed
(rpm)
Ramp Up Rate
(rpm/s)
Ramp Down
Rate (rpm/s)
Duration (s)
I
Drive receives valid
compressorspeed
demand.
1800
1600
-
4
II
Compressordwell
speed.
Default: 3600
(Configurable)
-
-
Default: 10
(Configurable)
III
Compressor
reaches demanded
speed.
Demanded
Speed
Default: 200
(Configurable)
Default: 200
(Configurable)
Table 2 –Compressor ShutdownSequence
Stage
Description
Target Speed
(rpm)
Ramp Down Rate
(rpm/s)
I
Drive receives compressorspeed
demand of 0 (controlled shutdown
request).
-
-
II
Compressorreaches minimumspeed.
9001
Default: 200
(Configurable)
III
Compressorhas stopped.
-
-
1This speed mayvary based oncompressor selected.

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Figure 1 –Compressor StartupProfile

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Figure 2 –Compressor Shutdown Profile
Drive Foldback Information
The compressor foldback varies basedon the envelope control mode selected (register 231). There are two
forms of envelop control, basic envelope protection andactive envelope protection.Basic envelope
protection uses a torque limit curve,that is related to speed to protect the compressor. Active envelope
protection uses the systems condensingand evaporatingtemperatures, provided via Modbus, to verify the
compressor is operating insidethe envelope. Table 3 shows all the envelope control modes available inthe
EVA3 drives.
The condensing fan is limited by power, i.e.when a 1/3Hp fan is selected, the drive willallow speeds up to
the maximum speed(register 1003)or 1/3Hp,whichever is reached first.

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Table 3 –Envelope Control
Modbus (Reg231)
Envelop ControlMode
Description
0
Basic Envelope Protection
The compressoris protected bya speed vs
torque table. When thetorque demand[reg.
61] is higherthan thetorque limit [reg. 62]
and the envelopetime out [reg. 55] reaches
0, the “Envelope Limit Timeout” fault will
occur[reg. 79&81, bit 2].
1
Basic Envelope Protection with
Minimum Speed Control
The compressoris protected bya speed vs
torque table. When thetorque demand[reg.
61] is higherthan thetorque limit [reg. 62]
the drive will activelyreducethe compressor
speed until the torque demandis less than
the torque limit. Duringthis time if the
envelope time out [reg. 55]reaches 0, the
“Envelope Limit Timeout” fault will occur
[reg. 79&81, bit 2].
2
Active Envelope Protection
The compressoris protected bymonitoring
the condensing [reg. 112] and evaporating
temperature [reg. 111]. These temperatures
are provided throughthe Modbusinterface. If
the compressor is operatingoutside the
envelope and theenvelope time out [reg. 55]
reaches 0, the “Envelope Limit Timeout”
fault will occur [reg. 79&81, bit 2].
3
Active Envelope Protection
with Minimum Speed Control
The compressoris protected bymonitoring
the condensing [reg. 112] and evaporating
temperature [reg. 111]. These temperatures
are provided throughthe Modbusinterface. If
the compressor is operatingoutside the
envelope and thespeed demandis higher
than the maximumallowed speed, the drive
will reduce the speedto themaximum
allowed basedon the compressoroperating
envelope.The compressor maximum[reg.
54] and minimumspeed [reg. 53] are updated
based on where thecompressoris operating
in the envelope. Duringthismode if the
envelope time out [reg. 55]reaches 0, the
“Envelope Limit Timeout” fault will occur
[reg. 79&81, bit 2].

AE8-1435
© 2023Emerson Climate Technologies, Inc.
Emerson Classification:Internal
18
Basic Envelope
The basic envelope protection uses a speedvs torque curveto determine if thecompressoris
operating outsidethe envelope. Whenthe torquedemand exceeds thetorque limit at the given
speed, the timeoutcounter will start counting. If the minimum speedcontrol is selected, the drive
will reduce the speeduntil thetorque demandis less thanthe torquelimit. Thisminimum speed
control logic is shownin Table 4. Figure 3 shows an example of what thespeed vs torquecurve
may look like, this curve will varybased onthe compressor model selected.
Figure 3 –Basic Envelope Example Speed vs Torque Curve

AE8-1435
© 2023Emerson Climate Technologies, Inc.
Emerson Classification:Internal
19
Table 4 –Basic Envelope Protection with Minimum SpeedControlLogic
Condition
Drive Action
Torque Demand >=
Torque Limit
Compressorspeed is reduceduntil thetorque demand is
less than the torque limit orthe maximumlimit speedhas
been reached.The maximum limit speedis the speed that
contains the highest torquelimit, continuingto reduce the
speed beyondthis pointwould causethe torque limit to
decrease. During this condition the envelopetimeout register
starts to countdown.
Torque Demand <
Torque Limit
Compressorspeed will return to demandedspeed(if
previouslyfoldingback)orcontinue to run the demanded
speed.
Envelope Timeout= 0
Report the “Envelope Limit Timeout” fault and set the
compressorspeedto 0.
Active Envelope
In the active envelopmode, the envelop is dividedintomultiple speedzones. The active envelope
protectionusesthe condensing andevaporating temperature information todetermine which
speed zone it is currentlyin. Registers 53 and 54 contain the maximumandminimumspeed
allowed basedon the zonethe compressoris operatingin. If thespeeddemand is outside the
limits inside the currentspeed zone, orthe compressor is outsidethe entire envelope, the
timeout counterwill startcounting. If the minimumspeedcontrol is selected, thedrive will
decrease the speed when a speed demandis higherthanthe maximumof the current speed
zone. The drive will set thedemand to the maximumof thespeed zone. Figure 4 shows an
example operatingenvelope, where eachcoloredshape represents a different speedzone.The
operating envelope will varybased onthe compressorselected. Table 5 shows theactionsthe
drive will take based ondifferentconditions forthe active envelopeprotectionwith minimum
speed control.

AE8-1435
© 2023Emerson Climate Technologies, Inc.
Emerson Classification:Internal
20
Figure 4 –Operating Envelope Example
Table 5 –Active Envelope Protection with MinimumSpeed Protection Logic
Condition
Drive Action
Speed > Max Speed (Current Zone)
Reduce compressor speed to maximumspeed
of current zone. Theenvelope timeoutregister
will start to count down untilthe speedis equal
to the maximumspeed of thecurrentzone.
Min Speed (Current Zone) <Speed <
Max Speed (Current Zone)
None.
Speed < Min Speed (Current Zone)
The envelope timeoutregisterwill start to count
down until thespeed is equal to or greaterthan
the minimumspeed of thecurrent zone.
Envelope Timeout= 0
Report the “Envelope Limit Timeout” fault and
set the compressor speed to 0.