DSM SUM-40 User manual

114 Southeast Parkway Ct.
Ste 160
Franklin, TN 37064
Tel: [phone]
Fax: [phone]
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SUM-40
OPERATING MANUAL
DYNAMIC STRUCTURES AND MATERIALS,LLC
REV.171011

R. 171011 1
114 Southeast Parkway Ct.
Ste 160
Franklin, TN 37064
Tel: [phone]
Fax: [phone]
Please review the following points for both personal and equipment safety while operating the
SUM-40 motor.
HIGH ENERGY/VOLTAGE WARNINGS
DO NOT attempt to open the SUM-40 motor. High voltages exist in
the internal power circuitry, and may persist for some time with the
power removed.
OPERATINGAND SERVICES PRECAUTIONS
Operate the motor in an environment free of flammable gases or fumes. Do not attempt to open,
modify, or repair the motor in any way. There are no user-serviceable parts inside the SUM-40
motor. Contact DSM for service and repair assistance.
INCLUDED POWER SUPPLY INFORMATION
Your SUM-40 may include an optional power supply module to convert AC (line) power into the
12 V/1.5A power required for the SUM-40 to operate. If your order includes a separate power
supply, please refer to manufacturer documentation for safety information before using it to
power your SUM-40 motor.
If you are using the Mean Well MDR-20-12, use the outputs labeled “+V” and “-V” as your +12
V and GND connections, respectively. See the table below for more information on the SUM-40
connector pinout.
CAUTION
RISK OF DANGER

R. 171011 2
114 Southeast Parkway Ct.
Ste 160
Franklin, TN 37064
Tel: [phone]
Fax: [phone]
Introduction
The SUM-40 is an all-in-one motor and controller system featuring high-resolution closed-loop
control, zero-power hold, high direct drive torque, and quiet operation. The SUM-40 only needs
an external power supply and a communications connection to operate; no external feedback
devices are required. This document describes the setup and operating specifications of the
SUM-40 motor. A separate document (“SUM-40 Communication Protocol”) describes how to
communicate with the SUM-40 from a host. Note that the RS-232 level is full voltage and is not
TTL compatible. A level converter must be used to connect the RS-232 port to a microcontroller.
Specifications
Property
Value
Notes
Mechanical
Mounting pattern
3.4mm through holes on
31mm square
NEMA 17 hole pattern
Output shaft diameter
4 mm
With flat
Output shaft length
11 mm
Nominal length
Overall size
40 mm x 40 mm x 34.4 mm
Mass
82 g
Operating temperature
-10 C –55 C
Shaft maximum radial load
20 N
Shaft maximum axial load
20 N away from motor,
10 N towards motor
Performance
Maximum speed
1800 deg/sec
No load
Maximum torque @ 700 deg/sec
100 mNm
See torque-speed information
below
Zero power hold torque
140 mNm
Feedback type
Optical encoder
Feedback resolution
46,592 counts/rev
0.0077 counts/degree
130 µrad
Range of motion
Continuous
Backlash
Zero
System is direct drive with no
gearing
Lifetime
2000 hours
Electrical/communications
Input voltage
12 V
Required power (max)
12 W
Idle power
<1 W
Baud rate
921600

R. 171011 3
114 Southeast Parkway Ct.
Ste 160
Franklin, TN 37064
Tel: [phone]
Fax: [phone]
Torque-speed performance
The SUM-40 uses a unique internal drive mechanism that features high direct drive torque and
true zero-power hold. The motor does not have a traditional “stall torque” in that the maximum
torque does not increase linearly as the max speed goes to zero. The full torque-speed plot is
shown below.
External torque loads above 100 mNm should not be applied to the system, as this may cause
backdriving. Backdriving the motor may reduce the overall life of the motor. Abackdriving load
is distinguished from a frictional load in that a backdriving load attempts to cause motion on the
motor output shaft, whereas a frictional load simply resists motion on the motor output shaft.
Temperature limitations
The SUM-40 motor is designed as a precision positioning device. As such, it is not capable of
running at a 100% duty cycle.An internal temperature sensor in the control electronics monitors
the internal device temperature, and will not allow operation if the internal temperature exceeds
80 C. The external case does not have an integrated temperature sensor, but should not be
allowed to exceed 55 C. Refer to the programming documentation for information on querying
the internal temperature of the SUM-40. Many factors determine the temperature of the SUM-40,
including duty cycle, mounting conditions, torque load, and external environmental temperature.
The maximum duty cycle for a particular application is best determined experimentally by
monitoring the internal and external temperature of the SUM-40 during operation in a
representative environment.
The table below gives approximate maximum continuous run-times at various rotation speeds for
an unmounted SUM-40. The table assumes no load operation. This data is provided for reference
only, and should not be considered as a specification. Actual run times before cooling down must
be determined in a specific application.

R. 171011 4
114 Southeast Parkway Ct.
Ste 160
Franklin, TN 37064
Tel: [phone]
Fax: [phone]
Motor speed (deg/sec)
Max continuous runtime
(minutes)
100
10
400
7
800
6
1200
5
Connections and installation
The motor mounts via four 3.4mm clearance holes arranged in a 31 mm pattern. These clearance
holes can be used with either M3 or #4 screws. The output is a 4 mm diameter D-profile shaft
extending approximately 11.2 mm out of the face of the motor. DSM recommends the use of
flexible shaft couplers when installing the motor to avoid placing off-axis loads onto the motor
output shaft.
The motor has an internal bearing capable of supporting up to 20 N pulling away from the motor
or 10 N pushing into the motor. The bearing can also support a maximum of 20 N of radial load
applied to the tip of the output shaft. Motor performance may be degraded slightly when fully
loaded in this way. DSM recommends isolating the SUM-40 motor with external bearings and
couplers designed for correcting shaft misalignments.
The SUM-40 motor has two connections on it; one multi-function connector, and one USB type
C connector. The multi-function connector has one digital input, one digital output, RS-232
connections, a 12 V input, and a Ground connection. The USB type C connector is for
communication only. The SUM-40 must be powered by the multi-function connector, but
communication is possible either by the RS-232 pins on the multi-function connector or the USB
type C connector.

R. 171011 5
114 Southeast Parkway Ct.
Ste 160
Franklin, TN 37064
Tel: [phone]
Fax: [phone]
The multi-function connector on the SUM-40 mates with a GHR-08V-S connector. DSM
includes one such connector with flying lead wires with the purchase of each SUM-40 motor.
The pinout of this connector is given below.
Pin number
Color
Function
Notes
1,2
Red
+12 V/1.5 A Power In
Both pins should be connected together to
the 12 V power supply.
3,4
Black
Ground
Both ground pins should be connected
together.
5
Blue
SUM-40 RS-232 Rx
Messages are sent TO the SUM-40 on this
pin.
6
Purple
SUM-40 RS-232 Tx
Messages are sent FROM the SUM-40 on
this pin.
7
Orange
Digital Input (0-12V)
Contact DSM for customization options.
8
Yellow
Digital Output (0-12 V)
Contact DSM for customization options.
On the GHR-08V-S connector, the pins are numbered such that with the disconnect tab facing
UP, pin number 1 is on the far LEFT of the connector.
For more information on communicating with the SUM-40, refer to the “SUM-40
Communication Protocol” document. That document includes command methods and specific
commands used to control the SUM-40.
Pin 1
Pin 8