Newport 850G Series User manual
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Section 1
850G Series Linear Actuator User Manual
1.0 Introduction
This manual describes the operation of Newport 850G Series Linear
Actuator. When purchased with a Newport controller, the 850G is fully
compatible with the ESP MotionMaster, and PMC200 series controllers. If
you have purchased the 850G for use with your existing Newport
controller, please read carefully the section below listing your controller
for compatibility and upgrade information.
2.0 Description
The 850G actuator incorporates a versatile design which can be
configured with travel limits from as little as approximately 1/32 inch to 2
inches (0.8mm – 50mm), enabling it to be used on a wide variety of
Newport translation stages and mirror mounts. Mechanical limit switches
cut motor power preventing accidental over-travel. The actuator
incorporates a manual actuation knob for coarse adjustment (with the
motor power off).
To provide accurate motion, the actuator’s 3/16 inch diameter plunger is
non-rotating. The standard gearbox ratio actuator can produce a maximum
thrust in excess of 25 pounds (11 kg); but, when operating continuously
over many cycles, the maximum load is rated at 18 pounds (8 kg).
The actuator’s internal structure is a precision-rolled leadscrew with a
0.8mm pitch. The pitch of the leadscrew has been chosen to provide the
same encoder resolution when combined with the standard gearbox ratio
(See table section 3.4). Production variations about this average figure can
be compensated by Newport controllers via software commands allowing
the user to limit cumulative, monotonic inaccuracies to within 0.005%. A
non-rotating low friction Turcite nut engages the leadscrew and pushes
the plunger. A Turcite half-nut is used to trigger a travel limit in the
extended position while the lead screw nut trips the limit at full retraction.
The limit switches are repeatable to approximately 40µm.
Section 2
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CAUTION
If the actuator encounters a hard stop within its range of travel (a
translation stage’s or mirror mount’s end of travel for example),
slip clutch releases to prevent damage to the gearhead. The clutch
is designed to slip just below the motor’s maximum torque. The
motor should be stopped as soon as possible to prevent
overheating in this high torque condition.
These actuators are powered by a low inertia DC motor to provide smooth
movement with low acoustic and mechanical noise. Submicron resolution
is obtained with a precision-rolled and electropolished stainless steel
leadscrew driven through a low backlash reduction gear. The overall drive
train backlash of approximately 15µm can be compensated by Newport
controllers. Bi-directional repeatability to 1.0µm can be achieved through
this feature.
The motor has an ironless-rotor to permit fast response due to its low
inertia. The brushes are precious-metal plated for long life. The factory
lubrication has a vapor pressure of 10-6 Torr at 25°C.
2.1 Controller Interfaces
The 850G Series actuators incorporate many new features, such as travel
limit switches and manual actuation, not found in previous Newport
actuators like the 850, 850A, and 850B Series. Additionally, since the 850G
use a higher torque motor, the servo parameters required for smooth
operation are different than for previous actuators. For these reasons,
controllers sold before the introduction of the 850G may not be
compatible and will require a special interface adapter. Some controllers
have been phased out and are not supported for the 850G.
2.1.1 MM1000DC/DCS750
The MM1000DC Controller/Driver (formerly DCS750) has been phased out
and is not supported to drive 850G Series actuators.
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2.1.2 MM2000 PC Card Motion Controller
The MM2000 controller drives up to four 850G actuators via Newport’s
Universal Interface box (UIB) P/N 21463-01 and using firmware version 1.5
or later. The controller firmware version may be displayed by using the VE
command. (Note that since the actuators are using the computer’s internal
power supply, there is a limitation of 2 axes that may move
simultaneously. Future versions of the UIB will incorporate an external
power supply for applications requiring 3 or more axes of simultaneous
movement.)
The UIB provides relays to cut motor power for manual knob use and
firmware version 1.5 or later provides commands to properly enable
manual positioning and keep track of encoder counts during a manual
move. The UIB may be purchased as an option when ordering an MM2000
controller and the proper version of the firmware is assured. To upgrade
an existing MM2000 controller with firmware version 1.4 or earlier, the UIB
must be purchased separately. The existing firmware may be used with
the following work around for manual actuation. When sending the
MOTOR OFF (MO) command, the I/O bits on the UIB which control the
power relays must be logged manually using the DEFINE BITS (BO), CLEAR
BITS (CB), and SET BITS (SB) commands. Refer to the MM2000 user
manual and the data sheet included with the UIB for more details.
CAUTION
Failure to manually toggle the I/O bits on the UIB for controllers with
firmware version 1.4 or earlier will leave power applied to the motor
after the MOTOR OFF command has been issued. Do not try to manually
adjust actuator position with power applied to the motor or damage will
result to the gearhead. Manual positioning should not require more
torque to turn the knob with the actuator cable attached than with it
unplugged. If you’re unsure about the effort required, unplug the
actuator to compare the feel of the knob before proceeding.
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2.1.3 MM2000RX Rack Mounted PC Card Controller
Existing MM2000RX controllers are incompatible with the 850G. Factory
upgrades may be done on a special request basis. New MM2000RX
controllers may be purchased to be compatible with the 850G on a special
request basis. Please call Newport for the latest information.
2.1.4 MM3000 Motion Controller/Driver
The MM3000 is completely compatible with the 850G Series actuators. All
that is required is to configure the controller with the proper driver card
and adjust the servo parameters per the specifications included in the
controller documentation.
2.1.5 MM4000/4005 Motion Controller
The MM4000/4005 are completely compatible with the 850G Series
actuators. All that is required is to configure the controller with the proper
driver card and adjust the servo parameters per the specifications
included in the controller documentation.
2.1.6 PMC100 Single Axis Controller
Existing PMC100 controllers are incompatible with 850G Series actuators.
Please call Newport for the latest information regarding upgrades for the
PMC100.
2.1.7 PMC200/PMC200-P Dual Axis Controller
PMC200 Series Controllers using version 3.1 or earlier firmware are
incompatible with 850G Series actuators and require an upgrade. The
firmware version is displayed on power up. Please call Newport for the
latest information regarding upgrades. PMC200 Series Controllers using
version 4.0 or later are compatible with the 850G Series actuators and
include the proper interface to handle the limit switches and manual knob.
Servo parameters may be set selecting type 850G in the controller setup
menu. There is also a menu to toggle motor power off for manual
positioning. An adapter cable (P/N 21731-01) must be ordered for each
850G actuator.
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CAUTION
Failure to toggle motor power off before attempting to manually position
the 850G will result in damage to the motor gearhead. Manually
positioning should not require more torque to turn the knob with the
actuator attached than with it unplugged. If you are unsure about the
effort required, unplug the actuator to compare the feel of the knob
before proceeding.
2.1.8 PMC400 Multi-Axis Controller/Driver
The PMC400 Controller/Driver has been phased out and is not supported
to drive 850G Series actuators.
2.1.9 ESP Series Controller/Driver
All ESP Series Motion Controller/Drivers are compatible with the 850G
Series actuator. The 850G actuator has an ESP smart chip inside, which
configures the ESP controller/driver, setting default parameters. Thus, the
850G actuator is ‘plug-and-play’ compatible with the ESP controller/driver.
2.1.10 Non-Newport Controllers
If you are using a non-Newport controller/driver please refer to the
connector pinout provided. Note that in order to utilize the manual knob
feature, power must be removed from the motor (open circuit). Failure to
do so properly may result in dynamic braking on the motor and cause
damage to the gearhead, invalidating your warranty.
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Notes
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Section 3
3.0 Installation, Set-up, and Operation
The actuators are shipped in sturdy, foam-cushioned boxes. Please inspect
the actuators and/or controllers immediately and notify the carrier if
damage is obvious. The actuator includes a wrench to access the travel
limit adjustment and a retaining nut for actuator mounting.
3.1 Setting the Travel Limits
Before mounting the 850G actuator, follow the directions below to adjust
the travel limits such that the actuator will trigger one of its limit switches
before encountering any external hard stop such as the end of travel of a
translation stage. Failure to do this may result in damage to the actuator
and/or the stage. Actuators are shipped with the travel limit set to less
than 1⁄2inch (12mm) to prevent accidental over-travel in most instances.
3.1.1 Remove the Coarse Travel Indicator Window
Find a clean flat surface to disassemble the actuator. (Tapped hole optical
tables are not recommended since many of the parts are small and may
drop into the table). Using the manual knob, adjust the actuator to the
zero position as read on the coarse position scale as shown in Figure 1.
Remove the four M2 flat head screws holding the cover, and place them to
the side. Gently pry off the cover as shown in Figure 2.
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Figure 1: Remove the cover with the Actuator in the zero position
Figure 2: Approximate travel range markings assist in
quick travel adjustment
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3.1.2 Reposition the Half-Nut to the Desired Travel
After removing the cover, laser marked lines indicating approximate travel
ranges can be seen. Remove the half-nut by lifting it from the lead-screw.
Note its orientation with respect to the lead-screw since it only fits one
way. (Figure 3). Approximate travel is set by replacing the half-nut onto
the lead-screw with its center scribe mark aligned to one of the markings
on the actuator body (Figure 4). These marks are only an aid to
determining travel.
The half-nut may be placed anywhere along the lead-screw. For full 2 inch
(50mm) travel, remove the half-nut completely and store it in a safe place
for future use in case shorter travel is desired.
Figure 3: The half-nut’s ramped corner triggers the
positive limit switch
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