Dynalabs DYN-MS-250 User manual

Model DYN-MS-250
250 N MS Shaker
Product Manual

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Product Support
If at any time you have questions or problems with the DYN-MS-250 shaker,
please contact a Dynalabs engineer at:
Phone: [phone] (9 a.m. to 5 p.m., UTC +3)
e-mail: [e-mail]
Warranty
Our products are warranted against defective materials and workmanship for one
year. Defects arising from user errors are not covered by the warranty.
Copyright
All copyrights of this manual belonging to Dynalabs products are reserved. It
cannot be reproduced without written consent.
Disclaimer
Dynalabs Ltd. provides this publication "as is" without warranty of any kind,
express or implied, including but not limited to, the implied warranties of
merchantability or fitness for a particular purpose. This document is subject to
change without notice, and should not be construed as a commitment or
representation by Dynalabs Ltd.
This publication may contain inaccuracies or typographical errors. Dynalabs Ltd.
will periodically update the material for inclusion in new editions. Changes and
improvements to the product described in this manual may be made at any time.

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Table of Contents
1) Introduction..........................................................................................................................................4
2) General Information.............................................................................................................................4
2.1) Unpacking and Inspection.............................................................................................................4
2.2) System Components......................................................................................................................4
2.3) Theory of Operation......................................................................................................................4
2.4) Specifications................................................................................................................................6
2.5) Outline Drawing............................................................................................................................7
3) Operation and Installation....................................................................................................................8
3.1) General..........................................................................................................................................8
3.2) Amplifier.......................................................................................................................................9
3.2.1) Amplifier General ..................................................................................................................9
3.2.2) Amplifier Internal Signal .....................................................................................................10
3.2.3) Amplifier External Signal....................................................................................................10
3.2.4) Amplifier Maintenance and Troubleshooting......................................................................10
3.3) Shaker-Structure Interaction (Stingers).......................................................................................11
3.4) Shaker Alignment .......................................................................................................................11
3.5) Shaker Mounting.........................................................................................................................12
3.6) Cooling........................................................................................................................................12
3.7) Frequency Response and Resonance ..........................................................................................12
4) Shaker Maintenance and Troubleshooting........................................................................................13
6) Declaration of Conformity.................................................................................................................14

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1) Introduction
The DYN-MS-250 is designed to provide dynamic force excitation for
modal testing of mechanical structures.
The DYN-MS-250 is a compact, lightweight and powerful general purpose
electrodynamic shaker providing up to 250 N peak sine force.
2) General Information
2.1) Unpacking and Inspection
DynaLabs products provide adequate protection for undamaged products to
be transported. Document the damages that occur indirectly during the
transport and contact the customer representative. Check all components of
the shaker. If there is a defect, please contact us.
2.2) System Components
The DYN-MS-250 has the following components:
- Electrodynamic Shaker
- Amplifier (DYN-SA-350)
- Cooling Unit (Blower + Hose + Hose connection adapter + R 1/2 Pneumatic
union)
- Power Cables (For Shaker + For Amplifier)
- Signal Cable
- Stinger Set
- Fuse
- User Manual
2.3) Theory of Operation
DYN-MS-250 is an electro-magnetic actuator. Electro-magnetic actuators
are basically voice coils consisting of a permanent magnet and coil. The
moving element can be the coil or the magnet depending on the design
requirements. The moving element is usually suspended by an elastic
membrane.
DYN-MS-250 has a moving coil (driving coil) whose current is controlled
for vibration generation. The stationary magnetic field is produced by a
permanent magnet.

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Item
Description
1
Amplifier Input
2
Cooling Port
3
Trunnion Handle

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2.4) Specifications
Parameters
Specifications
Output Force (Sinus)
250 N
Frequency
0-5 kHz
Displacement (Peak to Peak)
25 mm
Suspension
Carbon Fiber
Maximum Acceleration
100 g
Shaker Weight
11.6 kg
Cooling System
Forced Convection
Operation Temperature Range
5-35 °C
Maximum Input Current
10A (RMS)
Amplifier
External
DYN-SA-350
Operation Voltage
110/220 VAC
Sine Freq. Generator
Activated by pulling switch up
Sine Freq. Range
0-15 kHz
External Signal Voltage Level
10 VAC (PEAK)
Amplifier Weight
4.7 kg
DYN-BLW-511 Monofaze Blower
Frequency
50 Hz
Rated Power
0.8 kW
Input Voltage
230 V
Input Current
5.2 A
Blower Weight
15 kg

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2.5) Outline Drawing
The dimensional properties of DYN-MS-250 shakers are given below. All
dimensions are in mm.

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3) Operation and Installation
3.1) General
Refer to the figure below that shows the shaker connector configuration. Connect
the shaker/amplifier cable to the shaker and amplifier. Connect the drive signal
cable to the signal generator and connect the power cable of the amplifier. Then
turn on the amplifier by pushing the on/off button. To increase gain up, turn the
gain knob in clockwise direction. The user must turn off the gain button in order
to power down the shaker.

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3.2) Amplifier
DYN-MS-250 uses an external power amplifier for drive signal
amplification. Please note the wiring of the power amplifier given below.
3.2.1) Amplifier General

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3.2.2) Amplifier Internal Signal
The amplifier can generate sine signal from 1Hz to 15 kHz with 1 Hz
increments that the user can adjust with the Sine Frequency Generator
Switch. Connect DC power source and drive signal to shaker power input.
Pull the Gain Knob out. Raise or lower the Sine Frequency Generator Switch
to the desired Sine frequency. Adjust the Gain of the amplifier by turning the
Gain Knob clockwise. The frequency of the generated sine signal will be
visible on the LCD Screen.
3.2.3) Amplifier External Signal
Start the external signal source. Adjust the Gain of the amplifier by turning
the Gain Knob clockwise.
3.2.4) Amplifier Maintenance and Troubleshooting
The only user replaceable part is the fuse placed inside the shaker.

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3.3) Shaker-Structure Interaction (Stingers)
Stingers used in modal shakers are thin rods with a specific length yielding
low lateral and high axial stiffness. The high axial stiffness is necessary to
transmit the shaker force directly to the test structure with high efficiency
whereas the low lateral stiffness is necessary for protecting the shaker from
moment loads and to minimize shaker alignment issues. The stingers are
mounted on the shaker via a chuck. Force or impedance head sensors can be
mounted on the other side.
The Dynalabs modal shakers stinger sets include chuck and 3 stinger rod
sizes. The chuck consists of two pieces. The collet squeezes the stinger with
the tightening effect of the nut. Choose a collet size as close to your stinger
diameter as possible.
3.4) Shaker Alignment
Shaker alignment is a very important step of modal testing. Poor alignment
can cause force components in unmeasured directions and can even damage
the shaker. In order to overcome this problem, the trunnion can be adjusted
for proper alignment. Furthermore, the tip of the stinger can be removed
during the alignment process in order to reduce the free end deflection as
shown above.

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3.5) Shaker Mounting
The shaker is designed to rest on its rubber isolators. However, these
isolators can be removed for rigid or semi-rigid mounting. If it is not
possible to bolt down the shaker, hot glue is also a good mounting option.
The shaker can also be suspended by elastic bungee cords for lateral testing.
Additional inertial weight may be attached to the bottom of the shaker using
hot glue.
3.6) Cooling
DYN-MS-250 does not require forced cooling up to 125N operation. In
order to achieve full performance level of 250N use the cooling unit supplied
with the shaker. The cooling unit must be used in vacuum mode for best
performance. The connections of the cooling unit are given as below.
3.7) Frequency Response and Resonance
The following figure shows the acceleration levels/Input voltage versus
frequency of the shaker.

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4) Shaker Maintenance and Troubleshooting
The DYN-MS-250 shaker is a sealed device requiring no maintenance if the
operating instructions described in this manual are followed. Repair of
damage to the coil, exciter body or magnet core should not be attempted.
The only user replaceable part is the fuse placed inside the shaker. In order
to replace the fuse unplug all cables from the shaker and turn the cover in
counter clockwise direction as shown. Then replace the fuse and close the
cover. For any other problem, please return the shaker to Dynalabs for
proper repair.
5) Safety
Please ensure that this manual section is reviewed and understood prior to
installation, operation or maintenance of the equipment. The danger of
electrical shock or fire always exists in electrical equipment. The DYN-MS-
250 MS Shaker is designed for safe operation. Safety features such as
electrical insulation on outer surfaces are provided for the safe operation of
the shaker system.

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6) Declaration of Conformity
This declaration of conformity is issued under the sole responsibility of the manufacturer.
The product(s) are developed, produced and tested according to following EC- directives:
•2014/35/EU –Low Voltage Directive (LVD)
•2006/42/EU –Machinery Safety Directive
•2015/863/EU –RoHS Directive
Applied standards:
• EN 61010-1:2010
• EN ISO 12100:2010
• MIL-STD-810-H-2019 (Test Methods: 501.7 - High Temperature, 502.7 - Low
Temperature, 514.8 - Vibration, 516.8 –Shock)
DYNALABS MÜHENDİSLİK SANAYİ TİCARET LİMİTED ŞİRKETİ declares
that above mentioned products meet all the requirements of the above mentioned
standards and regulations.
Murat Aykan, Technical Manager
Ankara, 15.07.2021