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ACT2000
Operations
Manual
ACT2000
All-Electric Actuator
SD-6008-03
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This manual provides installation, maintenance, and operating instructions for the ACT2000 All-Electric Actuator. Every attempt has been made to provide sufficient information in this manual for the proper operation and preventive maintenance of the actuator. It is recommended that the user read this manual in its entirety. Operating the ACT2000 All-Electric Actuator in accordance with instructions herein ensures long term and reliable operation. If additional information is required,
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ACT2000 II
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ACT2000 Table of Contents Table of Contents ........................................................................................................................................i 1 INTRODUCTION............................................................................................................................. 1-1 1.1 Application ....................................................................................................................................1-1 1.2 Mounting P
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ACT2000 List of Figures Figure 1-1: ACT2000 Pin Mounted....................................................................................1-1 Figure 1-2: ACT2000 Flange Mounted..............................................................................1-1 Figure 1-3: ACT2000 Cut-Away View ...............................................................................1-2 Figure 1-4: Typical Identification Plate............................................................................
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ACT2000 1 INTRODUCTION This publication covers operation, installation and maintenance instructions for the ACT2000 Actuators manufactured by Precision Engine Controls Corporation. 1.1 Application The ACT2000 All-Electric Actuator is designed to meet general industrial motion control requirements for high temperature hazardous locations. Typical applications include gas turbine guide vane and valve motion control. 1.2 Mounting Provisions The ACT2000 can be pin or flange mounted. Fig
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ACT2000 1.3 Main Housing Assembly The main housing assembly contains a main housing, motor cover, extension rod bearing, and associated seals. See Figure 1-3. The main housing assembly is the primary structural system component and supports all the bearings, motor control electronics, motor cover, and mountings, which forms the explosion-proof containment. In order to provide main bearing thermal dimensional stability, the housing is fitted with a stainless steel liner. The liner is per
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ACT2000 1.4 Brushless DC Motor Assembly A brushless DC motor powers the ACT2000 linear drive mechanism. The DC motor contains a stator and rotor. See Figure 1-3 Motor Stator The motor stator is attached to the main housing by a pre-loaded wave spring and screws. Thermistors are embedded in the stator windings to monitor winding temperatures. The motor electrical power and thermistor wires pass from the motor through a conduit into the electronics housing. Motor Rotor The motor rotor
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ACT2000 1.7 Linear Drive Mechanism The Linear Drive Mechanism converts the rotary motion of the Motor Assembly to linear actuator motion. The core of the mechanical drive system is the linear ball screw drive containing a screw shaft, ball bearing fitted nut, extension rod and main duplex thrust bearings. Screw Shaft The thrust bearings, motor rotor, motor end bearing, and resolver rotor are mounted directly to the screw shaft. A ball bearing track is machined into the screw shaft. B
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ACT2000 1.9 Identification Plate A product identification plate is attached to the actuator housing assembly. Figure 1-4 shows a typical identification plate. The identification plate lists model designation, product part number, revision and unit serial number. Hazardous area operation, certification and electrical wiring interface information is also provided. Figure 1-4: Typical Identification Plate 1-5
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ACT2000 INTENTIONALLY BLANK 1-6
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ACT2000 2 FUNCTIONAL DESCRIPTION AND OPERATION This section describes system functions employed in the ACT2000 Electric Actuator. 2.1 System Description The ACT2000 is a closed loop servo system containing motor control electronics (MCE) and a brushless DC motor driven ball screw actuator. The actuator closes its own control loop on an internally generated position feedback. Thus, the actuator continuously modulates its position and provides precise positioning. The ACT2000 requires o
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ACT2000 DRIVER ASSY 120V RED REVERSE WHITE/RED + ACTUATOR POLARITY POWER GREEN PROTECTION POWER BRUSHLESS (80 - 160 VDC) - WHITE/GREEN ELECTRONICS DC MOTOR POWER INTERFACE BROWN DEMAND INPUT WHITE/BROWN TERMINATION DEMAND RTN YELLOW POSITION WHITE/YELLOW RESOLVER POSITION RTN 4-20mA OUTPUT BLUE MTR CURRENT WHITE/BLUE CONTROL MTR CURRENT RTN ELECTRONICS OPTICAL ISOLATION VIOLET RUN
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ACT2000 2.2.1 Power The ACT2000 operates on nominal 120 VDC, user-provided input voltage via the four-wire power harness. Refer to Figure 2-2 for typical connection. Refer to section 6 for specification values. Primary power wires. • +120 VDC is connected to the RED wire. • The 120 VDC return wire is GREEN. Redundant power wires: • +120 VDC is connected to the WHITE/RED wire. • 120 VDC return wire is WHITE/GREEN. ACTUATOR 120V INPUT BATTERY/POWER SUPPLY PWR [RED] PWR AUX
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ACT2000 Run Command The RUN command is a user provided discrete input to the ACT2000 which allows the actuator to track position demand. The +24 VDC signal shall be provided on the VIOLET wire. The signal return shall be provided on the WHITE/VIOLET wire. Reset Command The RESET command is a user provided discrete input to the ACT2000, which causes the actuator to go through the initial homing sequence and reset all internal position indicators. RUN and position demand inputs are ignor
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ACT2000 Motor Current Feedback The ACT2000 provides motor current feedback to the user. This internally generated feedback signal is proportional to actuator load. 4mA represents no load on the actuator. The motor current feedback is provided on the BLUE wire. The motor current feedback return is provided on the WHITE/BLUE wire. The expected external impedance is 250 ohms. The maximum external impedance is 500 Ohms. 2.2.4 Fault Alarms The discrete alarm outputs are opto-isolated electr
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ACT2000 2.3 Basic Operation and State Description The basic operation of the ACT2000 is described in the following sections. The Power-Up mode section covers the Power Up/Reset and the Set-Up states. The Run Mode section covers the Home/Dead Band, Holding Motor Current and the Run states. POWER SETUP COMMAND UP/RESET SETUP COMPLETE RUN COMMAND RESET COMMAND SET-UP RESET COMMAND RESET HOME COMMAND DEADBAND POSITION DEMAND <4.1 mA AND ACTUATOR POSITION FEED BACK <4.2 mA MOTOR CURRENT>MAX
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ACT2000 • If the ACT2000 receives a discrete RUN command, the firmware program will transition to the HOME DEAD BAND state. • If the ACT2000 receives a discrete RESET command, the firmware program will continuously reset. The actuator will not function and will remain in the power-up/reset state. WARNING: Property Damage Hazard – Always remove RUN command during Set-Up state. If a RUN command is given during program download, the actuator will not respond until download is complete.
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ACT2000 When the mechanical stop is found (actuator velocity less 0.05 inches per second), the MCE will apply the maximum homing force. Once the maximum homing force is applied, the firmware program will transition to the HOLDING MOTOR CURRENT state. Holding Motor Current State In the HOLDING MOTOR CURRENT state, the MCE applies a constant HOLDING FORCE, as long as, the position demand is > 2mA and < 4.1mA. See Figure 2-7. This feature allows the HOME position to thermally expand or
