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Compact, Low-Cost Solutions Catalog 8000-4/USA
OEM
OEM770 & OEM770X
142
Parker Hannifin Corporation
Compumotor Division
compumotor.com
Automation
Compact, Low-Cost
Solutions
The Making of a Servo System
Servo systems rely on feedback devices to continuously correct
for errors in current or torque, velocity, and position. A typical
servo system includes a servo controller, amplifier, and motor
with a feedback device. The servo amplifier can have varying
degrees of complexity and performance. A torque amplifier
(e.g. OEM770T) controls only the current loop. A positioning
servo (e.g., OEM770X) accepts encoder feedback to close the
position loop.
The OEM770 Family
The OEM770 family of products bring high performance in a
small, low-cost package. The OEM770 family offers a cost-
effective solution to a number of fractional horsepower brush-
less servo applications.
The OEM770 family was designed to operate with
Compumotors SM, SE, NeoMetric, J and BE series of motors
or any standard three-phase brushless DC servo motor
equipped with Hall effect sensors. The OEM770 family uses
three-state current control for efficient drive performance and
cooler motor operation.
The OEM770 family products are small and convenient to
use. Units install with only two screws (the screws also provide
grounding and captivate the cover). Their right-angle screw
terminal allows side-by-side mounting, and their small footprint
maximizes cabinet space. The snap-on molded cover is
removable for system configuration and helps provide a barrier
against environmental contamination. The drives are the same
size as a 3U Eurorack card. Their standard 25-pin connector is
compatible with universally available connectors.
Computer Programmable Standalone
Servo Drive/Controllers
Compumotors OEM770X drive/controllers are standalone, fully
integrated servo systems for fractional horsepower applica-
tions. Designed to provide greater flexibility and user conve-
nience, the single-axis OEM770X incorporates a built-in RS-
232C based controller in the same small package for quick,
easy programming. Users can program seven sequences and
utilize five programmable inputs and two programmable
outputs per unit.
See Also:
The OEM Family of
Stepper Drive Products
in the
Stepper Section B
Catalog 8000-4/USA
OEM
OEM770
143
Parker Hannifin Corporation
Compumotor Division
compumotor.com
Automation
Quality Products Designed and Priced for OEMs and High-Volume Users. Call 1-800-358-9070.
Compact, Low-Cost
Solutions
Compumotors OEM770 Series of servo drives were designed
for the needs of OEMs and high-volume users with a fractional
horsepower motion control application. These products were
developed to provide performance, compact packaging,
reliability, and power. The OEM770T is a torque amplifier
utilizing a
�
10VDC analog input making it directly compatible
with industry standard motion controllers.
Features
Performance Torque Mode operation with OEM770T Three-state current control for more efficient drive and
cooler motor operation Configurable current fold-back Plug-in resistors for peak and fold-back current Six-state drive design with hall effect sensors for
commutation Operates with brushless or brushed servo motors Several Brushless Servo motors are available from
Compumotor providing up to 190 oz-in continous and
570 oz-in peak torque
Reliability Short circuit protectedphase-to-phase and
phase-to-ground Overvoltage circuitry protects the drive from large inertial
loads Status/fault LED indicators to confirm proper operation Enclosed packaging reduces danger of environmental
contamination Overtemperature circuitry protects the drive from
excess heat
Packaging Application-specific integrated circuit (ASIC) and surface
mount technology minimize product footprint, overall
package size, and increase product reliability Removable snap-on molded cover for convenient configu-
ration and protection against contaminants Heat is dissipated through the mounting surface Install with only two screws (also provides grounding and
captivates cover) Universally available standard 25-pin D connector Right-angle screw terminal allows side-to-side mounting,
or Eurorack compatibility
Power Provides 6 Amps continuous current and 12 Amps peak
current Single 24-75 VDC power supply input Catalog 8000-4/USA
OEM
OEM770
144
Parker Hannifin Corporation
Compumotor Division
compumotor.com
Automation
OEM770 Specifications
Parameter
Value
Power Input
Voltage
2475 VDC
Current
012 amps
Power Output-Motor
Peak Current
12 A (approx 2 sec max duration at 45
�
C ambient temperature)
Continuous Current
6A
Voltage
90 VDC max
Peak Power
840 W (1.1 hp) @ 75 V supply voltage
Continuous Power
420 W (0.56 hp)
Switching Frequency
20 kHz
Bandwidth
2 kHz typical (dependent on motor)
Transconductance
1 volt = 1.2 amp
Commutation
120
�
hall effect sensors for six-state commutation method or brushed DC motor
Short-Circuit Protected
Yes
Power Output-Hall Effect
Voltage
+5 VDC
�
0.5 VDC
Sensors
Current
50 mA max
Short-Circuit Protected
No
Power Output-to Controller
Voltage
+15 VDC
�
1.5 VDC; -15 VDC
�
1.5 VDC
Output Stage
Current
10 mA max
Short-Circuit Protected
No
Control Inputs
Command Input
-10 V to +10 V analog voltage; 1 volt input = 1.2 amp output
Enable Input
Active LOW: 00.8 V @ 2 mA; when disabled: internal 2.49 k pull-up resistor to +5 VDC
Hall Inputs
Low State
0-0.8 V
High State
Internal 1 k pull-up resistor to +5 V
Input Frequency
02 kHz max
Signal Outputs
Fault Output
Active High: open collector output, max volts = 24 VDC; Inactive LOW: 0-0.4 VDC @ 0-
20 mA
Current Monitor
-10 V to +10 V analog voltage; scale: 1 V corresponds to 1.2 A output; Output Impedance: 10 K LEDs
Green = power; Red = various fault conditions
Protective Circuits
Short Circuit
Turns off outputs to motor; latched
Overtemperature
55
�
C
�
5
�
C trip temperature; latched
Overvoltage
95 V
�
5 V trip voltage; latched
Undervoltage
21.5 V max; not latched
Current Foldback
Configurable with 3 resistors
Position Error (OEM670SD)
2,047-16,383 post-quad encoder counts
Motor Characteristics
Minimum Inductance
50
�
H (micro Henrys)
Minimum Resistance
0.25 Loop Gain Adjustment
Configurable with one resistor
Motor Type
Compumotor recommends the OEM770 Series with NeoMetric, J, SM, SE and BE Series
motors.
Environmental
Minimum Temperature
0
�
C (32
�
F)
Max Temperature
45
�
C (113
�
F)
Max Heatplate Temperatsure
45
�
C (113
�
F)
Package Dissipation
Heatplate: 030 W, depending on motor current; PP = (I
AVG
/12 A) 30 W; Cover: 3 watts max
Physical
Power Connector
10-pin screw terminal; 14 awg max wire size
Input/Output Connector
25-pin D connector
Approx Dimensions
5" x 1.6" x 3.5" (127 x 41 x 90)
Weight
OEM770T: 12 oz B
Catalog 8000-4/USA
OEM
OEM770X
145
Parker Hannifin Corporation
Compumotor Division
compumotor.com
Automation
Quality Products Designed and Priced for OEMs and High-Volume Users. Call 1-800-358-9070.
Fully Integrated Controller
and Brushless Servo
Drives
The OEM770X is designed for the needs of OEMs and high-
volume users with a fractional horsepower motion control
application. Compumotors OEM770X fully integrated servo
systems combine the power, compact packaging, and reliability
of the OEM770T torque servo amplifiers with a simple, pro-
grammable, built-in, RS232C-based servo controller. Users can
program seven sequences and have five programmable inputs
and two programmable outputs per unit.
The OEM770X is ideal for less demanding motion control
applications such as rotary indexing, step-and-repeat, and
linear positioning. The X version is a cost-effective, single-
axis servo system to meet your high-volume application needs.
Features
Performance Servo controller and drive in one small package Standard RS-232C serial communications interface Optional 2 kBytes of battery-backed RAM to store up to 7
command sequences (-M2 option) Daisy chaining up to 256 units on one serial port Five programmable inputs for remote sequence select,
trigger, and home limit, and two dedicated limit inputs Two programmable outputs for machine interaction Operates with standard differential, optical encoder for
velocity and position feedback PID control algorithm used for servo tuning Several AC Brushless Servo motors are available from
Compumotor providing up to 190 oz-in continous and
570 oz-in peak torque
Reliability Short-circuit protected: phase-to-phase, and phase-to-
ground Overvoltage circuitry protects the drive from large inertial
loads Status/fault LED indicators to confirm proper operat