Bettis Manual: TEC2 Electronic Valve Actuators Engineering and Controls Manual | Bettis Manuals & Guides
TEC2 Electronic Valve Actuators
Engineering and Controls Manual (Model 500 Discontinued)
Release 2.0
TEC2 ENGINEERING & CONTROLS MANUAL
TEC2 ENGINEERING & CONTROLS MANUAL
RELEASE 2.0
CONTENTS
Introduction ........................................................... 2
Control Features .................................................... 3
Local Control ................................................... 3
Setup Options ................................................. 4
Remote Control ............................................... 4
Two -Wire .................................................. 5
Three-Wire ............................................... 5
Four-Wire .................................................. 5
Two-Speed Timer Options......................... 5
Local Emergency STOP .............................. 6
Emergency Shutdown ............................... 6
Inhibits/Interlocks ..................................... 6
Analog Position Controllers .................... 7-8
Remote Display Module (RDM) .............. 8-9
Indication & Monitoring....................................... 10
Local Indication ........................................ 10-11
Remote Indication ......................................... 12
Monitor Relay ................................................ 13
Analog Feedback – Position & Torque ............ 13
Diagnostics & Historical Data ......................... 14
Protection Features ........................................ 15-16
Electrical Specication .................................... 16-19
Enclosure Certications .................................. 20-21
Sectional View & Features ............................... 22-23
Network Controls ................................................ 24
Modbus RTU ............................................. 24-25
FOUNDATION™ Fieldbus .................................. 26
Probus ......................................................... 26
Ethernet TCP-IP.............................................. 27
HART.............................................................. 27
Mechanical Integrity ....................................... 28-29
Performance Data ............................................... 30
Outline Dimensions ........................................ 31-40
Circuit Coding & Diagrams ............................. 41-42
Remote Control Circuits ...................................... 43
Two-, Three-, & Four-Wire Circuits ................. 43
ESD & Inhibit/Interlock Circuits ...................... 44
Indication & Control Circuits ..................... 45-47
Digital Networks Controls ............................. 48
INTRODUCTION
Bettis has blended digital valve control technology
with mechanical components proven for decades.
TEC2’s power transmission gear train has a halfcentury track record of dependability with its bronze
worm gear, heat-treated steel rolled worm, and steel
motor gears.
Even though it employs microprocessorbased control, TEC2 still utilizes mechanical
displacement torque sensing. Rather than relying on
software algorithms related to such things as motor
speed or pressure-sensitive rubber pads, this directsensing approach uses a mechanical transducer
technology that has proved reliable for over 50 years.
RELIABILITY INSIDE AND OUT
TEC2 has been built on the solid foundation
of Series 2000 (with its heritage of ruggedness,
reliability and success in diverse applications
worldwide) and will provide long-term service
with minimal maintenance, thus ensuring low
“cost-of-ownership.”
It also ensures wide interchangeability of parts—
a hallmark of Bettis designs; in fact, 60% of parts
are interchangeable across Bettis' quarter-turn &
multi-turn range. This interchangeability allows
greater exibility in the eld, easier maintenance,
and reduced spare-part stocking for hundreds of
components (including motors, motor gearing,
clutch assemblies, torque spring assemblies, and
electrical control modules).
Logical design of TEC2 quarter-turn and multi-turn
actuators, plus addition of a few optional modules,
simplies initial engineering and procurement.
Other advantages of the TEC2:
• Quarter-turn & multi-turn designs follow the
same basic construction
• Wiring diagrams are common for all
valve types
• Wide range of torques and speeds to suit
most applications
• Wide range of positioning/process
control options
• Motors, gears, and torque springs are easily
replaced in the eld if speed changes
are required
• Low maintenance after many years of troublefree service
TEC2 Options & Accessories ................................. 50
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CONTROL FEATURES
LOCAL CONTROL
TEC2’s Local Display Module (LDM), with its unique IconoText screen, consists of the following features:
• Graphics Display: Displays mode of operation, valve status, position, torque, and alarm symbols
• Message Center: Displays actuator setup selections, data entry feedback, and alarm messages
• Control Knob: Performs normal Open/Stop/Close functions in Local Control mode, and YES/NO
functions in Monitor/Setup mode
• Selector Knob: Performs normal selector-switch Local/Stop/Remote function and NEXT/BACK display
function in Monitor/Setup mode. (The Selector Knob may be padlocked in any of its three positions.)
• Three LEDs: Red/Open, Green/Close, Yellow/Stop (default)
• IrDA/Bluetooth Tranmiter & Receiver: Duplicates same functions as Control and Selector Knobs using Bettis'
optional hand-held “Clicker” remote controller or PC
• BlueTooth Transmitter & Receiver: Duplicates same functions as Control and Selector Knobs using optional
handheld or PC
Figure 1: Local Display Module (LDM)
Valve Torque
LEDs
IrDA Transmitter & Receiver
Graphics Display
Message Center
(2 lines, 16 characters each)
Selector Knob
Control Knob
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SETUP OPTIONS
TEC2 provides freedom to choose from any of three Tri-Set conguration setup methods:
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• Control knobs on either the Local
Display Module (LDM) or on the
optional Remote Display Module
(RDM), which can be mounted up to
1200 meters (4000 ft) away from the
actuator
• PC via RS-485 link to the actuator
utilizing DCMlink™ Windows®based software*or via the IrDA port
• Bettis' optional keychain “Clicker”
device. The “Clicker,” an IrDA
controller, has four buttons that
correspond to the Yes, No, Back
and Next functions of the local
control knobs. The entire actuator
conguration process can be
completed using this compact tool.
(Clicker not available in Japan or
England)
Figure 2: Tri-Set Configuration
REMOTE CONTROL
Remote control capability permits the actuator to be controlled via a variety of discrete inputs:
• Two-wire control with either:
- contact closed or digital signal high to OPEN valve
- contact open or digital signal low to OPEN valve
• Three-wire control to OPEN and CLOSE valve, but with no intermediate STOP if Momentary Contact
mode is selected (seal-ins activated)
• Four-wire control (default setting) to OPEN and CLOSE valve, and STOP in mid-travel
• Two-speed timer & anti-water hammer
• Network Control (Modulating, Block Mode)
• ESD and inhibit/interlock signals
• Analog position controllers
• Up to two optional RDMs (Remote Display Module) are available. See page 8 for details.
Control can be achieved by either a Maintained Contact or Momentary Contact signal. Refer to pages
43-48 for remote wiring connections. The signal may be powered externally with a control voltage in the
range 18-150VDC or 20-250VAC, or internally from 24VDC power supply derived from on-board control
transformer.
Current draw for each control input: 12mA @ 24VDC, or 12mA @ 250VAC
Minimum ON voltage: 12V
Maximum OFF voltage: 6V
Minimum signal duration: 50mS
All remote control inputs are opto-isolated – built-in surge immunity is 25kV as standard.
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Two-Wire Control with Maintained Contact to Open or Close
Two-wire control mode uses only one contact to control the actuator, with that contact often being
controlled by a relay. Actuator can be congured to OPEN valve either when contact is closed (digital signal
high) or when the contact is open (digital signal low). Momentary Contact mode (seal-ins activated) is not
possible for two-wire control: the actuator will reverse direction as soon as remote input changes state.
Three-Wire Control with Maintained Contact (Push-to-Run) or Momentary Contact
Three-wire control mode uses two contacts to OPEN or CLOSE the valve. Actuator can be congured,
during setup, for either Maintained Contact (push-to-run) or Momentary Contact (seal-ins activated)
control mode. When Momentary Contact mode is selected, valve cannot be stopped in mid-travel except
when an inhibit/interlock, ESD, or emergency STOP signal is present at terminals.
Four-Wire Control with Momentary Contact and Mid-travel Reversal
Four-wire control mode uses three contacts to OPEN, CLOSE or STOP valve in mid-travel—Momentary
Contact mode (seal-ins activated) being selected automatically. Default conguration for STOP input is
“active on open contact,” although this can be reversed to “active on close contact” during setup.
Two-Speed Timer (Optional)*
The two-speed timer option uses microprocessor technology to control the operating time of the valve in
either opening or closing direction, or in both directions. Actual speed of the actuator is not controlled, but
instead, the motor is pulsed so that the rate of opening or closing is reduced. Motor pulse ON time and OFF
(dwell) time, and valve position at which pulsing starts and stops, are selectable and individually adjustable
for either direction of travel.
Pulse ON time: Selectable 1–10 seconds, in 0.5 second increments
Pulse OFF time: Selectable 1-100 seconds, in 1 second increments
Start and Stop positions: Selectable 1-99% OPEN, in 1% increments
Anti-Water Hammer (Optional)*
The anti-water hammer feature provides additional protection against the valve being operated too
quickly in the closing direction, as it approaches fully closed position, in order to slow rate of ow in the
pipeline. Pulse time start position can be adjusted to any position between CLOSE and 30% OPEN position
but pulsing will only stop when fully closed position is reached. If this feature is enabled in Setup, it will
override any settings congured for the two-speed timer once start position has been reached while moving
in the CLOSE direction.
Pulse ON time: Selectable 1–10 seconds, in 0.5 second increments
Pulse OFF time: Selectable 1-100 seconds, in 1 second increments
Start position: Selectable 1-30% OPEN, in 1% increments
* NOTE:
Requires solid state motor control module.
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Local Emergency Stop*
A hard-wired emergency stop function bypasses all electronics and ensures that the actuator “stays put”
regardless of any other signal present at actuator terminations. Two dedicated terminals are provided and
emergency stop is initiated when an open-circuit exists between them—a jumper is provided as standard,
ex-factory, and the user should replace this with a N.C. contact if this feature is required.
* NOTE:
Local emergency stop will not trigger alarm back at the host system
Emergency Shutdown (ESD)
A remote ESD signal will override any local or remote-control signal (except hard-wired emergency stop
feature) and command the actuator to operate the valve to a pre-selected position to either close or open
the valve or to make it “stay put” in its present position.
ESD action can be congured to override the following conditions:
Motor thermal overload* [Default setting – OFF]
Selector in Local position [Default setting – OFF]
Selector in Stop position [Default setting – OFF]
Active inhibits [Default setting – OFF]
Torque switch trip [Default setting – OFF]
* WARNING:
Overriding the motor thermal protection will invalidate hazardous area certification.
Inhibits/Interlocks
Actuator can be prevented from operating in either OPEN or CLOSE direction, or both, until an external
contact has been made. This is useful when interlocking with other process equipment (e.g. pumps, other
valves, sensors, PLC, DCS, etc.), and it will inhibit operation in both remote and local operating modes.
Default setting is ON for both directions.
Inhibit signal can be overridden by a remote ESD signal if it has been pre-selected during Setup.
Inhibit/interlock inputs are isolated from control inputs by having a separate common terminal, thereby
segregating the safety system from the operational control system and also allowing different voltage levels
to be used.
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Analog Position Controllers (Optional)
Futronic options includes two analog inputs and two analog outputs that can be congured for position,
torque, setpoint or user setting.
A) Futronic II Position Controller
The Futronic II position controller, with electromechanical reversing contactor, is capable of handling
position and process control via a 4-20mA input signal, and includes a 4-20mA feedback signal of position
derived from a non-contacting position sensor. Units are available for either three-phase or single-phase
power supplies. Suitable for operating at a rate of up to 1200 starts/hour (three-phase motors) or up to 100
starts/hour (single-phase motors).
• Accuracy: ± 1%
• Control bandwidth: 0.1% to 5%, adjustable in 0.1% increments (default: 2%)
• Speed bandwidth: 0.5% to 9%, adjustable in 0.1% increments (default: 5%)
• Delay time: 0 to 60 seconds, adjustable in 0.25 second increments (default: 1.0 second)
• Input impedance: 250 ohms
• Input polarity: (Selectable) 4mA = Close or 20mA = Close (default: 4mA = Close)
• Output polarity: (Selectable) 4mA = Close or 20mA = Close (default: 4mA = Close)
• Loss of signal: Selectable to Fail open, Fail close, Fail to preset position, or Stay Put in last
position (default)
* NOTE:
Not available on Model 500. (Model 500 Discontinued)
B) Futronic IV Solid-State Process Controller
The Futronic IV process controller includes a solid state reversing starter, and is capable of handling
process control via a 4-20mA input signal, and includes a 4-20mA feedback of position derived from a
non-contacting position sensor. Units are available for either three-phase or single-phase power supplies.
Suitable for operating at a rate of up to 1200 starts/hour (three-phase motors) or up to 100 starts/hour
(single-phase motors).
• Accuracy: ± 0.5%
• Control bandwidth: 0.1% to 5%, adjustable in 0.1% increments (default: 2%)
• Speed bandwidth: 0.5% to 9%, adjustable in 0.1% increments (default: 5%)
• Delay time: 0 to 60 seconds, adjustable in .25 second increments (default: 1.0 second)
• Input impedance: 250 ohms
• Input polarity: (Selectable) 4mA = Close or 20mA = Close (default: 4mA = Close)
• Output polarity: (Selectable) 4mA = Close or 20mA = Close (default: 4mA = Close)
• Loss of signal: Selectable to Fail open, Fail close, Fail to preset position, or Stay Put in last
position (default)
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C) Three-Wire Analog Position Controller – Futronic II or IV
This feature, if selected during Setup, provides a means for backup control in case of loss of analog input
signal. It allows a valve to be controlled as normal from a 4-20mA input signal, but with the possibility
of this input signal being overridden by discrete digital inputs in the OPEN or the CLOSE direction, or in
both. Discrete inputs may be used to operate the valve on loss of analog signal. As soon as digital signal is
removed, actuator returns automatically to its normal analog mode.
Patented Remote Display Module (RDM) (Optional) (Patent 7,430,453)
The RDM is an exclusive control and display module, available only from Emerson, that puts TEC2’s non-
intrusive controls within easy reach, no matter where the actuator is installed. It has display capabilities
identical to those of the Local Display Module (LDM), and it can perform the same control, conguration,
and diagnostic tasks. If the RDM is to receive power from the actuator, connect cable type Belden 8723 or
equivalent, the cable distance is limited to 1,200 feet (366 meters). Two RDMs can be networked by using
two cables (Belden 8719) with a single actuator at a distance up to 4000 ft (1200 meters) from actuator,
and each can perform the same control, conguration, and diagnostics tasks as the local controls on the
actuator. Applications include typical situations in which a valve is in an inaccessible location (e.g., down in
a pit or high up in the plant, or outside the wall on a tank storage facility) where access to valve might be
dangerous in the event of a re or leakage of fumes.
The RDM communicates with the actuator via an RS-485 communication link and a single twisted-pair cable.
Table 1: Typical Cabling Requirements
RDM Interface Function Cable Type (Belden Or Equivalent)
AC-RDM AC Supply – 85/300V, 50/60Hz
RS-485 Data Connection
DC-RDM DC Supply – 24V from Actuator Belden 8719 Belden 8723
RS-485 Data Connection
* NOTE:
If two RDMs are connected to the unit, only one can be powered by the actuator, the second RDM must be powered
externally.
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Figure 3: Remote Display Module (RDM)
TEC2 ENGINEERING & CONTROLS MANUAL
Priority Of Control Between LDM and RDM:
The RDM module is in continuous communication with the central processor in the actuator. Remote
control from the control room is only possible if all selector switches are in REMOTE mode. As soon as any
selector switch is placed in LOCAL mode, then local control can be achieved at that position. If any of the
selector switches are placed in STOP mode, neither local nor remote control will be possible. Any one of the
selector switches may be padlocked in STOP mode to prevent control from other locations (i.e., lock-out,
tag-out).
Power Requirements:
A single RDM can be powered via internal 24VDC supply from actuator.
One or both RDMs can be powered from an independent 115/220VAC power source.
Current draw per RDM:
285 mA @ 24VDC
65 mA @ 115VAC
35 mA at 220VAC
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INDICATION & MONITORING
LOCAL INDICATION
The IconoText screen displays alarm symbols, mode of operation, valve status, valve position, and torque
output throughout the valve travel. Its message center comprises two lines of text, 16 characters per line,
and displays actuator setup selections, data entry feedback, actuator status, diagnostic data and alarm
messages. Text messages are in English language, as standard. In addition to English, Spanish, Portuguese,
Russian, French, Mandarin, Italian, German, Czech, Indonesian, Polish, Turkish, Vietnamese are also
supported.
The following alarms are available to be displayed, if active:
Valve Drift (handwheel) Open Inhibit Lost Analog Signal Moving Wrong Direction
Open Torque XX% Power Fail Close Inhibit Actuator Fail
Close Torque XX% Phase Monitor Local ESD Setup Error
Valve Stalled Motor Overload Remote ESD Set Limits Before Operating
CCM Link Failure LDM Link Failure RDM1 Link Failure RDM2 Link Failure
APD Link Failure Analog Input Out Of Range Analog Input Lost
LEDs (red, green, and yellow) on Local Display Module (LDM) indicate the following status and alarm
functions:
Table 2: Alarms
Valve Activity
Fully Close Off On Off
Opening Flashing Off Off
Stopped Off Off On
Fully Open On Off Off
Closing Off Flashing Off
Alarm Off Off Flashing
Default functions for CLOSE (green) and OPEN (red) are as shown. Alternate functions for CLOSE (red) and
OPEN (green) can be programmed in the eld or prior to shipment (if specied at time of order).
Adjacent to the LEDs is the IrDA transmitter/receiver that permits the Clicker device or PC to
communicate with the actuator, without the need for interconnecting cables or opening the enclosure.
Red Green Yellow
Display Function (LEDs)
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Figure 4: LCD Display
TEC2 ENGINEERING & CONTROLS MANUAL
LED Indicators
Operation
Module
Display
Diagnostic
Valve
Torq ue
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REMOTE INDICATION
Standard Relay Contacts
TEC2 is supplied, as standard, with four latching volt-free contacts that provide remote feedback of actuator
status. Each contact can be independently congured for normally open, normally close or ashing (1 second
interval) mode.
Contact rating: 5A @ 30VDC, or 5A @ 250VAC resistive, or 2A @ 250VAC inductive
Relay output function can be congured from a wide range of options (see Table 5). Default settings are:
Table 3: Relay Output Functions (Default Settings)
Relay Default Function Default Setting
RO #1 Valve Full Open (LSO) Normally Open Contact
RO #2 Valve Full Close (LSC) Normally Open Contact
RO #3 Intermediate Valve Position (LSA) Normally Open Contact
RO #4 Intermediate Valve Position (LSB) Normally Open Contact
NOTE:
RO #3 and RO #4 can be configured as LSO and LSC. Default LSA and LSB can be set anywhere between 0 – 100%
Auxiliary Relay Module (ARM)
Optional ARM module provides four additional latching volt-free contacts for status or alarm indication. These
contacts are independently congurable for normally open, normally close or ashing (1 second interval) mode as
well as a wide range of optional functions (see Table 5). The default settings are:
NOTE:
ARM not available with Network Controls
Table 4: Auxiliary Relay Module (ARM) (Default Settings)
Relay Default Function Default Setting
RO #9 Lost Power Normally Open Contact
RO #10 Motor Overload Normally Open Contact
RO #11 Lost Phase Normally Open Contact
RO #12 Over Torque Normally Open Contact
All relay output contacts—RO #1 to 4 and RO #9 to 12—can be congured to signal any one of the
functions listed in the table below.
Table 5: Relay Output Function Options
LSO – Open Limit LSC – Close Limit Opening Closing
Moving – Open or Close Selector in “Local” Selector in “Stop” Selector in “Remote”
LSA – Mid-travel Position “A” LSB – Mid-travel Position “B” Open Inhibit Signal Present Close Inhibit Signal Present
Local ESD Signal Present Valve Operated Manually Over Torque – Open or Close Host Control
Motor Overload Open Torque Limit Close Torque Limit Lost Power
Valve Stall Actuator Fail Lost Phase Valve Drift
ESD Active Lost Analog Signal Channel 1 Low Battery Open Inhibit
Close Inhibit Actuator Fail Alarm Lost Analog Signal Channel 2
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MONITOR RELAY
Monitor relay (RO #5) indicates whether actuator is “available” for remote control and is energized when
conditions are normal. Relay will de-energize should any of the following events/faults occur in actuator:
• Selector switch in “Local” position
• Selector switch in “Stop” position
• Torque switch tripped in mid-travel
• Loss of internal control power
• Actuator Fail Alarm
• Motor overload trip
• Loss of one or more phases of the incoming power supply
• Valve stall
Monitor relay has one normally open and one normally close contact. It resets automatically as soon as
the event/fault is corrected.
Contact rating: 5A @ 30VDC, or 5A @ 250VAC resistive, or 2A @ 250VAC inductive
ANALOG FEEDBACK
Analog Valve Position Feedback (VPF)
A non-contacting 4-20mA analog output signal is available for continuous remote position feedback of
valve position. Output can be powered from actuator’s internal 24VDC supply, or externally from a remote
24VDC power source.
Repeatability: ±1%
Linearity: ±2% of total valve travel
External impedance: 250 ohms nominal (1000 ohms maximum)
Analog Valve Torque Feedback (VTF)
A non-contacting 4-20mA analog output signal that is proportional to actuator output torque (15% to
100%) is available for continuous remote torque feedback as the valve is being operated in both directions
of travel. VTF output can be powered from the actuator’s internal 24VDC supply or externally from a remote
24VDC power source.
Repeatability: ±1%
Linearity: ±2% of maximum output torque
External impedance: 250 ohms nominal (1000 ohms maximum)
NOTE:
VTF output can be used in conjunction with a suitable software program such as DCMLink to provide “torque
profiling” for the valve and, subsequently, be used for predictive maintenance purposes, since an increase in torque
required to operate valve may indicate that valve is wearing, corroding, etc.
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DIAGNOSTICS & HISTORICAL DATA
Diagnostic and historical data about the actuator can be viewed at any time, without entering a password, by
accessing display diagnostics through the message center on the LDM (Local Display Module). The following data is
available for viewing or downloading to a PC:
Event Log
- This log provides time stamped data that captures internal events within the actuator such as alarms,
commands, actuator modes, temperature changes and motor control. It is capable of recording up to 5000
separate events.
Alarm Log
- See list in Table 2, Page 10. Display lists last nine alarms that have occurred. List progresses from most recent
to oldest alarms received.
Torque Prole
- Torque data is recorded throughout valve travel of the last stroke in both open and close directions,
expressed as a percentage of maximum output torque of the spring installed in the actuator.
Torque Archive
- Torque archive is data stored at a time initiated by user while in “Valve Control Setup” mode. It would
typically be at the time that the actuator was initially installed on valve or after valve had been reconditioned, or a similar notable event.
Operation Log
- This log provides data that might assist with troubleshooting. It contains the operation details accumulated
since it was last reset. Data displayed:
- Motor Starts (number of times the motor has been started)
- Number of Strokes (number of full strokes from limit to limit)
- Motor Run Time (total motor operational time)
- This log can be reset to zero by entering the “Change Settings” mode.
Operation Archive
- This log provides same data as Operation Log but accumulated data is from initial commissioning of
actuator and, therefore, gives a full history for actuator.
- This log cannot be reset by user. It is intended to be reset only by qualied Bettis personnel after a major
overhaul of actuator.
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Real Time Clock
- The real-time clock keeps track of the current time. The Real Time Clock can be set with the display or
through the Network (DCMlink™) and keeps the DAY, MONTH, YEAR, HOUR, MINUTE, Seconds. The RTC
runs off the main AC power, but has an alternate source for running on batteries. If no batteries are installed
upon power loss time would be lost. If batteries are installed, RTC will keep accurate time when power is
lost.
Partial Stroke Test
- The Partial Stroke Test provides an operation validation that partially strokes the actuator. The Partial Stroke
Test start position can be congured to 100% (default) or 0%. The PST travel range can be congured from
30% (default) to 10% in 1% increments. The mid-test pause can be congured from 1 to 100 seconds with 5
seconds being the default. The PST will report pass fail information on output relays 3 and 4 and will also be
captured in the event log.
Hardware
- This display reports status of modules and can identify which module is at fault if a problem exists with the
actuator.
- Hardware status report can indicate whether module is:
- Normal
- Not Congured
- Lost Link
- Failed
- Hardware displays provide data on:
- Electrical compartment temp. (°C)
- APD (Absolute Position Detector)
- Central Control Module
- Local Display Module
- Remote Display Module #1
- Remote Display Module #2
- Analog Module
- Network Module
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PROTECTION FEATURES
MOTOR PROTECTION
Inherent thermal overload sensors are embedded in motor stator winding to protect the actuator motor
from overheating. Sensors open if temperature exceeds 130°C for T4 or 115°C for T4A, and de-energize
reversing contactor (or solid-state starter) to remove power to motor. Motor protection can be overridden
by an ESD signal, if so congured during Setup. Local and remote indication of Motor Overload is provided.
Additional motor protection (optional) can be provided by use of overload relay with bimetallic current
sensor to match motor current. (Refer to page 19 for additional information.)
AUTOMATIC PHASE DETECTION & CORRECTION
Phase monitor ensures that the actuator motor rotates in correct direction regardless of how three
phases have been connected to actuator terminals—thereby reducing risk of damage to valve during startup due to incorrect phasing. It continuously checks incoming supply and shuts down reversing contactor if
one or more of the phases is lost; it will also prevent actuator from starting if one phase is missing. Local and
remote indication of a lost phase (single-phasing) is available.
TORQUE PROTECTION
TEC2 retains the established and reliable technology of measuring actual torque load by the sliding worm
method that has served for over 50 years in all applications and climates. Movement of the worm against a
calibrated set of precision disc-springs rotates a gear; the rotation is converted to an electronic
signal by Hall-effect sensors. This direct-sensing method provides accurate and reliable torque monitoring
over the life of the actuator in all environments. Since no fragile transducers are used in the motor, and no
complex algorithms involving motor speed are used to estimate torque being developed, there is no need
for specially constructed or specially wound motors. This permits Bettis motors to be replaced or rebuilt by
local motor repair facilities and avoids the need for costly new motors to be purchased.
Torque sensors for open and close direction can be adjusted independently in the range 15 – 100% of
rated torque range of spring stack installed in actuator.
Output torque or speed of operation can be easily modied in the eld by changing gear ratios, spring
stacks, or motor sizes. No complicated reprogramming of torque processors is necessary, thereby providing
the highest degree of exibility for the customer.
IGNORE TORQUE
In certain applications, such as torque-seating, the amount of torque needed to open the valve from the
Close position is greater than the congured “OPEN TORQUE” value. In such situations this option allows
actuator to ignore torque from the known position to a congurable position, 0 to 10% in 1% increments.
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LOG-JAM PROTECTION
If torque demanded by the valve in mid-travel, in either direction, exceeds value congured by the valve
supplier, the TEC2 will automatically de-energize the actuator motor and deduce that there may be an
obstruction in the valve. It will then automatically reverse direction of travel for 1.0 second and retry to
overcome the obstruction three times. This will provide an opportunity for the obstruction to be cleared by
ow of pipeline medium but, if unsuccessful, further electrical operation will be inhibited until the problem
is cleared. This may simply require torque conguration to be increased in Valve Control Setup due to
changes in process parameters or wear/corrosion in the valve that have affected torque requirement. This
feature can be switched off in Valve Control Setup, if not required. Local and remote indication of overtorque
is available.
MOTOR REVERSAL PROTECTION
It is possible to reverse direction of travel, in both local and remote modes, without rst issuing a Stop
command. An automatic time delay of 0.5 seconds occurs on reversal of signal to protect actuator motor
and reversing contactor against damage due to high surge currents and inertia.
ELECTRICAL SPECIFICATION
POWER SUPPLY OPTIONS*
TEC2 actuators are available for three-phase (three-wire) and single-phase power sources:
Three-phase 50Hz
220, 380, 415, and 460 volts
Three-phase 60Hz
208, 230, 380, 440, 460, 575, and 690 volts
Single-phase 50Hz
115 and 230 volts
Single-phase 60Hz
115 and 230 volts
DC
24 VDC (Model 500 only)
The nominal operating voltage must be specied at time of order. Published actuator performance data
is for power supply variations of ± 10% voltage and ± 5Hz frequency. If power supply variations are outside of
these limits, please consult Emerson to ensure that actuator performance meets your requirements.
NOTE:
Some options are not available on Model 500. Please check factory for details. (Model 500 Discontinued)
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