Armstrong Emech G2 Instruction manual

Emech®Digital Actuator - Model G2
Installation, Operation, & Maintenance
Manual
458-EN Please read and save these instructions.

Table of Contents
1.0 - Model G2 Actuator Data Sheet..............................................................................2
Parts and Materials........................................................................................................3
Dimensions ....................................................................................................................4
Technical Data ...............................................................................................................5
2.0 - Mechanical Installation.........................................................................................7
2.1 - Assembly of G2 Actuator onto a 3-Port Mixing Valve (3/4” to 2”)....................................7
2.2 - Assembly of G2 Actuator onto other valves .....................................................................8
3.0 - Electrical Installation ............................................................................................9
3.1 - General Information ......................................................................................................... 9
3.2 - Wiring Instructions ........................................................................................................ 10
3.2.1 - Wiring Instructions.............................................................................................. 10
3.2.2 - Power Supply Wire Specification......................................................................... 11
3.2.3 - Wiring of Actuator mA Loop Reciever ................................................................. 11
3.2.4 - Wiring of Actuator mA Loop Transmitter ............................................................. 12
4.0 - Current Loop I/O ..................................................................................................15
4.1 - Standard Configuration of Current Loop Input for Temperature Mode ............................15
4.2 - Standard Configuration of Loop Input for Positioner Mode ............................................17
4.3 - Standard G2 Current Loop Output Characteristic ............................................................19
5.0 - Keypad Operating Instructions............................................................................21
5.1 - Capacitive Buttons ..........................................................................................................21
5.2 - Lockout...........................................................................................................................21
5.3 - Actuator Menu Structure.................................................................................................22
5.4 - Actuator Menu Descriptions............................................................................................24
5.5 - Modbus Registers...........................................................................................................27
6.0 - Troubleshooting Guide ........................................................................................28
7.0 - Limited Warranty and Remedy ...........................................................................32

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 1 of 36
Introduction
Congratulations on selecting the Emech®product from Armstrong. Armstrong devotes considerable care and attention to the design of its
products. To obtain the best performance from your Emech®product, this manual should be carefully read from cover to cover. It contains
important installation, operation, and maintenance instructions.
The customer must strictly adhere to the safety tips, troubleshooting advice, cautions, and warnings that are listed in this manual. Along
with the warnings, instructions, and procedures outlined in this manual, the customer should also observe such other procedures generally
applicable to similar equipment.
If the customer does not follow these and other such warnings, instructions and procedures, the product may not perform as expected.
More seriously, failing to follow these instructions and warnings may cause property damage, personal injury, production down-time, and
other losses.
The customer should train its employees and contractors in the safe use of Armstrong products in relation to the customer’s specific
application. If the customer does not understand something in any part of this manual, contact Armstrong or its your authorized Armstrong
sales representative.
Safety
If instructions in this manual are not followed:
Icon Legend
!
Injury or death and property damage are imminent.
!
Injury or death and property damage are possible.
!
Potential property damage, expensive repairs, and/or voiding the warranty may result.
!
• Applicable codes must be followed and supersede any other instructions. Generally applicable
codes in the US include:
• IPC (International Plumbing Code)
• Read this manual
• Improper installation or operation may cause a flood resulting in property damage, personal
injury, or death. Armstrong strongly recommends a qualified professional to install this product.
• Service must be performed by a qualified professional.
• Improper installation, start-up, operation, maintenance, or service may void the warranty.
Hot water or metal may cause scald burns. Skin exposure to 140°F (60°C) water or metal for only five
seconds may cause a second-degree burn.

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 2 of 36
1.0 Digital Actuator Model G2 Datasheet
Emech®G2 actuators offer all the benefits of intelligent control. High performance closed-loop temperature control is achieved when the
G2 actuator is combined with Emech®3-port and 2-port disc valves and sensors. Control with butterfly and other quarter-turn valves can
also be significantly enhanced by the Emech®G2 actuator.
Multiple sensor connectivity options and onboard software for stand-alone closed-loop control are included as standard features.
Emech®G2 actuators provide compact, configurable, high-speed actuation solutions for 0° - 350° applications and torques up to
885 in/lb continuous.
Emech®G2 Actuator Features
G22 Model: 310 in/lb torque, 24vDC 5 Amp
G23 Model: 885 in/lb torque, 24vDC 5 Amp
Emech®G2 Actuator Sizes
• Keypad and display allows for full actuator configuration without external
devices required
• Three operating modes:
• Standalone control via onboard keypad and remote control options
• Analog (4-20mA input and output ports)
• Modbus (RS-485)
• Extra digital input for interfacing ancillary devices (e.g. flow switch, level
switch)
• Electrical stepper motor control
• 90° stroke time as low as 1.5 seconds for fast control action
• Precise positioning achieving 0.03° valve seat placement
• Local closed loop control of temperature
• Failsafe position feedback (non-contact absolute encoder)
Electronic Features
• Roller bearing shaft support
• Gearbox: planetary, lifetime lubrication, low backlash
• Graduated visual indicator
• Epoxy powder coated aluminum enclosure designed to Nema 4X.
• Manual over-ride with electrical safety interlock
• Stainless steel fasteners
• 100% Duty Cycle rated for continuous control
• Electronic stroke setting (up to 355° rotation)
Mechanical Features
• Emech®3 Port temperature control valves
• Emech®2 Port and other 1/4 turn control valves
• Heat exchanger control
• High speed electronic actuation
• Dairy: Pasteurizing
• Tanning: Pelt washing - temperature control
• Brewery: Mash water temperature control
• Meat works: Hand wash/sterilization/washdown/triple wash
• Vessel temperature control
• Clean-in-Place Skids
• Food, beverage, bakeries and general industrial process control applications
Applications
G22 Actuator and 2-Port Valve
G23 Actuator and 3-Port Valve

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
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Page 3 of 36
Parts and Materials
# G22 and G23 Details Materials of Construction
1 Padlock holes for manual override N/A
2 Body top Powder coated aluminum
3 Drive enclosure (extrusion) Powder coated aluminum
4 Body base Powder coated aluminum
5 Nameplate 316 stainless steel
6 Mounting bracket (Fits ISO5211 F05 & F07 size) 316 stainless steel
7 Electronics enclosure Powder coated aluminum
8 Sealed plug (for factory encoder adjustment) Nickel plated brass
9 Fixings and spring washers Stainless steel
10 Plug ½ NPT cable entry Plastic
11 Temperature sensor input Nickel plated brass
12 Pressure relief vent 316 stainless steel
13 Manual override handle 316 stainless steel / Acetyl
14 Keypad label Polycarbonate
15 Drive coupling 316 stainless steel
16 2-piece slotted coupling 316 stainless steel
17 Fixings and spring washers Stainless steel
1
2
3
4
5
6
7
8
910
1112
13
15
14
Note: Standard mounting kits are included
with all Emech®Mixing Systems.
The two couplings (Item 16), fixings, and
spring washers (Item 17) are not included
when ordering an Emech®Actuator only.
These two items must be ordered separately.
16
17

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 4 of 36
Dimensions
A
B
3.15”
80mm
0.04”
1mm
Mechanical Data G22 G23
A: Width 4” (101.6mm) 4.81” (122.2mm)
B: Height 12” (304.8mm) 15.5” (393.7mm)
C: Maximum valve stem depth 1.12” (28.5mm) 1.12” (28.5mm)
D: Width 5.8” (147.3mm) 6.71” (170.45mm)
E: Rotation Ø 3.54” (90mm) 7.09” (180mm)
F: Width 7.7” (195.6mm) 8.51” (216.2mm)
G: Center of coupling to end of box 5.25” (133.4mm) 5.65” (143.5mm)
Weight 16 lbs 31 lbs
⎕⎕Size Options: 10mm x 10mm OR 14mm x 14mm
Note: Actuator side of mounting kits are all F07. Other mounting kits are available upon request. Consult factory.
C
Size
D
E
Rotation ∅
Pull out handle to engage.
0.32”
8mm
Valve Side
F
G
4 x ∅.334 THRU
8.5mm
∅2.756±0.004 PCD
70.00mm±0.10
∅1.969±0.004 PCD
50.00mm±0.10
4 x ∅.26 THRU
6.5mm
∅1.535±0.004
39.00mm±0.10

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 5 of 36
Technical Data
Environmental Standards
Ambient Temperature 14°F to 122°F (-10°C to +50°C
Protection Standard (Upright mounted) Designed to meet NEMA 4X
Protection Safety C-Tick, AS/NZ2064 Class A, EN 50081-1, EN50082-1, EN50082-2, FCC47 part-15 A7B
Mechanical Mounting ISO 5210 / ISO 5211
EMC requirements Actuator Housing and Cable Conduit must be connected to earth
Device Mode / Specification
Temperature Controller
Control Range 32°F to 212°F (0.0°C to 100.00°C)
Accuracy ± 0.9°F (0.5°C)
Setpoint Resolution Local Mode ± 1.0°F (0.5°C) Remote Mode ± 0.18°F (0.1°C)
Positioner
Control Range 0 to 100%
Stroke Range (User-selectable) 0 to 350°
Accuracy ± 1°
Control Resolution ± 0.03°
Setpoint Resolution Local Mode ± 0.5% Remote Mode ± 0.1%
Visual Shaft Position Indicator 10° graduated scale (on shaft coupling)
Torque / Speed (1) G22 G23
Nominal Torque 885 in/lb (100 Nm) @ 5 rpm 885 in/lb (100 Nm) @ 5 rpm
Default Maximum Speed 6 rpm 6 rpm
Default Speed 3 rpm 3 rpm
Nominal Stroke Time 1/3 Turn 1.5 seconds* 3.0 seconds*
*No slow zone and at maximum speed, acceleration and deceleration
Manual Override G22 G23
Turns / 360° Shaft Revolution 74 124
Maximum Lever Force 3.0 lbf (1.5 kgf) 2.0 lbf (1.0 kgf)
Rotational Lever Pull to engage Manual Override
Operating Modes
Configurable Option Local / Analog / Modbus, Temperature Controller / Positioner, Gains
Set Point Signal** 4-20mA Current loop input, Modbus RS-485 or locally by keypad entry
Output Signal** 4-20mA Current loop output, Modbus RS-485
Keypad (local control) 6 Capacitor Buttons; Set Mode, Up, Down, Left. Right and Dual Touch Safety
** The Emech®G2 current loop transmitter and receiver are both isolated.
!
UP
THE ACTUATOR MUST
NOT BE INSTALLED
UPSIDE DOWN.

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 6 of 36
Technical Data, cont.
Electronic Actuator Model Code
Model Nominal Torque (1) Maximum Speed (RPM)(1) Supply Voltage
G22 035 - 35 Nm / 310 in/lb @ 5 rpm 8 24VDC
G23 100 - 100 Nm / 885 in/lb @ 5 rpm 8 24VDC
Accessory Parts Part Number
Temperature Probes (Cable length) CPAC0021 (350 mm) - Temperature probes with longer cable length are
available. Consult factory.
Mounting Kit F05 used on 3/4” (20 mm) and 1” (25 mm) Emech® valves CPMA0070
Mounting Kit F07 used on 1-1/2” (40 mm), 2” (50 mm), and 3” (75 mm)
Emech®valves CPMA0071
Mounting Kit ISO F12-AR1 used on 4” (100mm) Valve CPMA0129
Power Supply D34095 (24vDC)
Blade Fuse D159969
Notes:
1. Nominal torque is the output torque at 6 rpm for G22 and 5 rpm for G23.
2. Maximum speed is the maximum recommended operating speed.
3. Contact Armstrong for special mounting kits.
Electrical Data
Power Supply Requirement 24 VDC Regulated Supply ± 10% (at the actuator terminals)
Fuse 7.5 A Blade Fuse
Analog Control Signal (Input) 4 to 20mA
Analog Feedback Signal (Output) 4 to 20mA Feedback Accuracy 0.5% (of full range)
Display 16 Character LCD with color-indicating back light
Serial Interface RS-485 (Non-isolated)
Auxiliary Sensor Input Internal Connector
Temperature Sensor Input 3 pin M8 (Female) connector
Temperature Sensor Thermistor (NTC 10kOhm @ 25°C)
Cable Gland Entry Bottom Entry
Power Spply Consumption at 24.0 Vdc
Model Current Power
G22 3.4 Amax 85 Watt
G23 4.4 Amax 115 Watt
* Exceeding motor current and speed defaults will increase current and power.

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 7 of 36
2.0 - Mechanical Installation
2.1 - Assembly of G2 Actuator onto a 3-Port Mixing Valve (3/4” to 2”)
11
2233
55
44
66
NOTE: The actuator may be mounted in any one of
four positions.
The following instructions explain how to mount
the actuator so that it is facing the outlet port.
To ensure the actuator is in the ‘zero’ position,
power on the actuator (a 24VDC regulated power
supply is required). Ensure the actuator is in
Temperature Controller mode - hold mode and
press down (-) on the actuator keypad to toggle
between Temperature and Positioner mode.
Once in Temperature mode, disconnect the
temperature probe from the actuator. The actuator
will move automatically to the ‘zero’ position and
the keypad display will show “E2”.
Set the Valve position to closed. Ensure the notch
on the spindle (Image 1) points towards the valve
“0” mark and the cold port (Image 2) which is the
fully closed position for the valve seats and the
default cold port (Image 2).
Place the graduated coupling (Image 3) on the
spindle & ensure the zero points to the outlet port
(Image 4).
If the actuator is to be mounted in one of the other
three positions, rotate the graduated coupling so
that the “ZERO” mark will line up with the notch in
the bracket (Image 8) of the actuator, when valve
is fully coupled to actuator.
DO THIS ALIGNMENT BEFORE PLACING THE
COUPLING ON THE SPINDLE.
Place the center coupling (Image 5) on the
graduated coupling (Image 6).
Cold port
Outlet Port
Zero
Center
Coupling

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
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Page 8 of 36
7788
991010
1111 1212
Place the actuator on the valve in the desired
position (Image 7). The zero mark on the coupling
(Image 4) should align with the notch on the
bracket (Image 8).
Insert one M8 X 25 socket cap screw into one of
the mounting holes with M8 Spring Washer and
Nut. Insert the remaining three cap screws and
fasten.
Ensure the bonded washer (Image 9) is on the
sensor (Image 10).
Screw the sensor into the outlet port of the valve
(Image 11) and tighten before connecting the
sensor to the actuator.
Plug the sensor connector into the actuator input
port labeled “1” and hand tighten. The actuator is
now assembled correctly (Image 12).
WARNING! DO NOT USE A WRENCH TO SCREW
THE SENSOR INTO THE ACTUATOR.
Refer to Section 5.0 of this manual for keypad
operating instructions and configuration details.
2.2 - Assembly of G2 Actuator onto other valves
Please contact Armstrong for assistance when assembling the G2 actuator onto other valves. A variety of standard moutning kits and
custom mounting kits are available to mount the Emech® actuator onto other valves.
Mechanical Installation, cont.

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 9 of 36
!
!
!
3.0 - Electrical Installation
Do not attempt electrical installation unless you are qualified to do so under the laws of your
jurisdiction. It is essential that you understand the information in this section to achieve a successful
electrical installation. If in doubt, contact Armstrong or its authorized sales representative.
The wiring of the actuator must be carried out by a qualified technician and according to the
instructions described below.
The wire sizes as recommended in the instructions must be adhered to.
Always consider environmental and mechanical conditions of the installation, such as ambient
temperatures, chemicals, moisture and exposure to mechanical impacts, shock and vibration.
For mechanical protection of the wiring as well as to comply with EMC (Electro Magnetic Compatibility)
standards it is recommended to place the wiring in screened conduit or to use screened cables.
3.1 - General Information
The enclosure of the Actuator has one 1/2” NPT cable (or conduit) entry points. Use an appropriate conduit adapter for these cable entries
and use screened (PVC coated metal) conduit (connected to earth) with appropriate ingress ratings. Install the conduit as required for the
installation and place the wire or cables in the conduit as described in the wiring instructions.
Continued on next page
Image 3.1 Diagram of Emech®G2 Actuator circuit board
FL V+
FL IN
NTC2
OV
OUT+
OUT-
SHIELD
IN+
IN-
SHIELD
A+
B-
OV
NTC 2FLOW4-20 OUT
4-20 INMODBUS
MOTOR 24V IN ENCODER
FUSE
+V
OV

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 10 of 36
!
!
!
3.2 - Wiring Instructions
Wire the supply connections as indicted below using the correct diameter shielded cable. When placing the wiring in metal conduit, which
is earthed, shielded cable is not required.
WIRE THE SUPPLY FIRST (before making any other connections). Ensure that the actuator supply
consists of a 24VDC supply (not AC) and that the voltage tolerances are within the permissible voltage
limits of the actuator.
SWITCH THE SUPPLY OFF BEFORE CONNECTING!
3.0 - Electrical Installation, cont.
3.2.1 - Wiring Instructions
Ensure conduits and wire screens are
properly grounded to reduce possible
effects of EM (Electromagnetic Interference)
on actuator operation.
Refer to Table 3.1 as a guide for wiring cable lengths and voltage drops.
WARNING!
When the actuator is wired to the power
supply, it is important that the voltage drop
to the actuator remains no more than 1-2
Volts when the actuator is operating under
load.
To check this, put a meter on the DC supply
terminals at the unit, and measure the
24VDC supply. Keeping the meter in place,
use the manual handle to move the valve
out of position, or change a set value so the
actuator is instructed to move.
IF YOU OBSERVE GREATER THAN 2 VOLTS
DROP ON THE POWER SUPPLY AT THE
ACTUATOR WHEN OPERATING, PLEASE
REVIEW AND INCREASE WIRE DIAMETER
BEING UTILIZED TO MINIMISE VOLTAGE
DROP OVER DISTANCE OF CABLE RUN.
EXCESSIVE VOLTAGE DROP AT THE
ACTUATOR UNDER LOAD CAN LEAD
TO UNRELIABLE PERFORMANCE AND
POTENTIALLY PERMANENT DAMAGE TO
THE INSTALLED UNIT.
Continued on next page

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 11 of 36
3.2.2 - Power Supply Wire Specification
3.0 - Electrical Installation, cont.
Consider the minimum cross sectional area and length of the supply cable such that the voltage drop across the total cable length remains
within the permissible voltage tolerance of the actuator. For example when using a 0.75mm2 cable, the voltage drop will be a 1.2V at 3A
and 10m length, which is 5% of the 24V supply. Use the table 3.1 below as a guide to determine cable size and maximum length.
Table 3.1: Cable Length (depending on cable area and actuator model)
G22 35Nm Area Resistance Drop Recommended Maximum Absolute Maximum
AWG mm2 m0hm/ft m0hm/m V/ft V/m ft m ft m
20 0.5 0.021 0.07 0.064 0.21 19.7 6 38.0 11.6
18 0.75 0.015 0.05 0.043 0.14 29.5 9 56.7 17.3
-- 1.0 0.009 0.03 0.030 0.10 39.4 12 78.8 23.1
16 1.5 0.006 0.02 0.213 0.07 55.8 17 113.8 34.7
-- 2.0 0.006 0.02 0.015 0.05 75.4 23 151.5 46.2
14 2.5 0.003 0.01 0.012 0.04 95.1 29 189.6 57.8
G23 100Nm Area Resistance Drop Recommended Maximum Absolute Maximum
AWG mm2 m0hm/ft m0hm/m V/ft V/m ft m ft m
18 0.75 0.015 0.05 0.070 0.23 16.4 5 34.1 10.4
-- 1.0 0.009 0.03 0.052 0.17 23.0 7 45.6 13.9
16 1.5 0.006 0.02 0.037 0.12 32.8 10 68.2 20.8
-- 2.0 0.006 0.02 0.027 0.09 45.9 14 90.9 27.7
14 2.5 0.003 0.01 0.021 0.07 55.8 17 113.8 34.7
3.2.3 - Wiring of Actuator mA Loop Reciever
To comply with EMC (Electro Magnetic Compatibility) standards, the wiring must be placed in the conduit (must be connected to earth
ground) and shielded twisted pair cable (0.25mm2) should be used (see Figure 3.3 below).
Figure 3.3
Controller with isolated output

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 12 of 36
!
3.2.4 - Wiring of Actuator mA Loop Transmitter
3.0 - Electrical Installation, cont.
To comply with EMC (Electro Magnetic Compatibility) standards, the wiring must be placed in the conduit (must be connected to earth
ground) and shielded twisted pair cable (0.25mm2) should be used.
Depending on the type of input available on the controller (PLC), i.e.; isolated mA Loop input (isolated from earth potential Figure 3.4) or
non-isolated input (referenced to earth ground) and if a loop supply is available, different wiring schemes are feasible. See Figures 3.4 - 3.6.
Due to this arrangement the loop input is no
longer isolated which requires the input on
the controller to be isolated!
Figure 3.4
Controller with isolated 4-20mA loop input (recommended) using the
24VDC supply from the actuator by means of a wire link.

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
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Page 13 of 36
Figure 3.5
Controller with non-isolated 4-20mA loop input using the 24VDC supply
from the controller or PLC itself. (Recommended)
3.0 - Electrical Installation, cont.
Figure 3.6
Controller with non-isolated 4-20mA loop input using the 24Vdc supply
from an external isolated supply.
This could possibly increase noise in the system and is therefore not
recommended.

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 14 of 36
!
3.2.5 - Temperature Sensor Connector
3.0 - Electrical Installation, cont.
The sensor input and internal electronics are specifically designed to use the Emech® temperature probe.
Do not attempt to use any other type of sensor as this may damage the actuator
Sensor port connector
Plug 1/2” NPT
cable entry
Figure 3.8 Underside of Emech®G2 actuator showing the sensor port connector
Switching will enable various features of the Emech®G2 actuator such as BIGAIN, STANDBY, HOLD, and INVERSE ACTUATOR OPERATION.
These features are outlined on the following page and the actuator software configuration are listed in section 5.3.3.
This input can be used in conjunction with the G2 actuator’s automatic gain switching feature to allow the actuator to respond appropriately
in applications where flow is variable or intermittent.

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 15 of 36
!!
4.0 - Current Loop I/O
The Emech®current loop hardware is capable of operating across the standard 4-20mA range. By default the linear control range, for both
input and output, has been limited to the range of 5-19mA.
Values outside this range on the loop input represent non-linear behaviors such as closed, cold only or hot only.
Values outside the 5-19mA range on the loop output are used to signal error conditions. Contact Armstrong for customized configuration
settings.
WARNING!
The voltage range required for the latest version actuators current loop input will vary from 3.5VDC for
4mA of current to 5.6VDC for 20mA of current at the terminals. Therefore, the PLC controller will need
to be setup to provide at the actuator 3.5VDC at 4mA to a maximum of 5.6Vdc at 20mA.
If the voltage at the actuator current loop input terminals exceed about 9VDC or about 50mA threshold,
the input circuit protection will be activated and the current loop signal will be clamped to ground.
This has the effect of ‘locking out the PLC signal and closing the actuator on “loss of signal”. This
situation remains until the PLC signal is reduced below this threshold, whereby control is restored.
Therefore, the PLC controller must be setup to avoid sending a current loop signal to the actuator of
50mA or higher.
4.1 - Standard Configuration of Current Loop Input for Temperature Mode
The unit will respond to the current loop input when in REMOTE mode only (Refer to Section 5.4). The full control range in Temperature
mode is 0-100°C or 32-212°F. This corresponds to a Loop Input range of 5 to 19mA. Calibrate the current loop transmitter (usually an
external PLC or Controller) according to the following equations.
Temperature Linear Range Calculation in Degrees Celsius (°C)
Current input (mA) = (0.14 x Temperature required (°C)) + 5
Temperature Linear Range Calculation in Degrees Fahrenheit (°F)
Current input (mA) = (0.0778 x Temperature required (°F)) + 2.511
If given a signal outside the 5-19 mA range, the Actuator will not control temperature, but will move to a fixed angle depending on the
Actuator configuration. Refer to Figure 4.1 for a graphical description of Loop Input behavior in Temperature Controller mode for several
standard configuration types.
Continued on next page

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 16 of 36
4.0 - Current Loop I/O, cont.
Figure 4.1 Standard Loop Input for Temperature Mode

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 17 of 36
4.2 - Standard Configuration of Loop Input for Positioner Mode
4.0 - Current Loop I/O, cont.
The unit will respond to the current loop input when in REMOTE mode only (Refer to section 5.4). The full control range in Positioner mode
is 0-100%, corresponding to a Loop Input range of 5 to 19 mA. Calibrate the current loop transmitter (usually an external PLC or Controller)
according to the equations below.
If given a signal outside the 5-19 mA range, the actuator will behave according to the response curves given in Figure 4.2. Note that the
actual operating stroke is dependent on configuration settings and valve type, Figure 4.2 shows several common configurations.
Position Calculation: % of Max Open Position
For the input current range of 5 to 19 mA and position of 0 to 100% of the maximum open position.
Current input (mA) = (0.14 x Position required (%)) + 5
Position Calculation: 1/4 turn application in rotational Degrees
Current input (mA) = (0.1556 x Position required ( °CCW)) + 5
Position Calculation: Emech®F3 application in Degrees
Current input (mA) = (0.0609 x Position required ( °CCW)) + 5
Continued on next page

Armstrong International
221 Armstrong Blvd, Three Rivers, MI 49093 - U.S.A.
Tel: [phone] Fax: [phone]
Designs, materials, weights, and performance ratings are
approximate and are subject to change without notice.
Visit armstronginternational.com for the most updated information.
Page 18 of 36
4.0 - Current Loop I/O, cont.
Figure 4.2 Standard Loop Input for Positioner Mode