Oriental motor MD Series User manual

1
Introduction
Before using the product
Only qualied personnel of electrical and mechanical engineering should
work with the product. Use the product correctly after thoroughly reading
the section "Safety precautions." In addition, be sure to observe the contents
described in warning, caution, and note in this manual.
The product described in this document has been designed and manufactured
to be incorporated in general industrial equipment. Do not use for any
other purpose. For the power supply, use a DC power supply with reinforced
insulation on its primary and secondary sides. Oriental Motor Co., Ltd. is not
responsible for any damage caused through failure to observe this warning.
Safety precautions
The precautions described below are intended to ensure the safe and correct
use of the product, and to prevent the user and other personnel from exposure
to the risk of injury. Use the product only after carefully reading and fully
understanding these instructions.
Handling the product without observing the instructions
that accompany a "WARNING" symbol may result in serious
injury or death.
Handling the product without observing the instructions
that accompany a "CAUTION" symbol may result in injury
or property damage.
Note
The items under this heading contain important handling
instructions that the user should observe to ensure safe
use of the product.
[Description of graphic symbols]
Indicates "prohibited" actions that must not be performed.
Indicates "compulsory" actions that must be performed.
yDo not use the product in explosive or corrosive environments, in
the presence of ammable gases, locations subjected to splashing
water, or near combustibles. Doing so may cause re or injury.
yDo not transport, install, connect, or inspect the product while the
power is supplied. Always turn o the power before carrying out
these operations. Injury may result.
yDo not forcibly bend, pull or pinch the lead wire. Doing so may
result in re.
yDo not disassemble or modify the fan. Doing so may cause injury.
yAssign qualied personnel to the task of installing, wiring,
operating, inspecting, and troubleshooting the product. Handling
by unqualied personnel may result in re or injury.
yKeep the input-power voltage within the specied range. Failure to
do so may result in re.
yFor the power supply, use a DC power supply with reinforced
insulation on its primary and secondary sides. Failure to do so may
result in electric shock.
yPerform connections securely according to the connection diagram.
Failure to do so may result in re or a skin burn(s).
yShut o the power to the fan in the event the rotating part (blades)
is locked during operation and the burnout prevention circuit is
activated. Otherwise, the fan will start unexpectedly when released
from the locked condition. This may cause injury or damage to
equipment.
yTurn o the power in the event of a power failure. Otherwise, the
fan will start unexpectedly when the power is restored. This may
cause injury or damage to equipment.
yDo not use the fan beyond its specications. Doing so may result in
injury or damage to equipment.
yKeep your ngers and objects out of the openings in the fan. This
may cause injury.
yDo not lift the fan by holding the rotating part (blades) or lead wires
of the fan. Doing so may cause injury.
yDo not remove the lead wire of the fan from the frame hook. Doing
so may cause damage to the lead wire.
yKeep the area around the fan free of combustible materials. Failure
to do so may result in re or a skin burn(s).
yDo not leave anything around the fan that would obstruct
ventilation. Doing so may result in damage to equipment.
yDo not touch the rotating part (blades) while operating. Doing so
may cause injury. The use of the nger guard is recommended to
ensure protection.
yBefore installing the fan, take measures against static electricity.
Failure to do so may result in damage to equipment.
yWhen an abnormal condition has occurred, immediately stop
operation to turn o the power supply. Failure to do so may result
in re or injury.
ySecurely install the fan in an enclosure. Failure to do so may result in
injury or damage to equipment.
HF-3179
OPERATING MANUAL Thank you for purchasing an Oriental Motor product.
This Operating Manual describes product handling procedures and safety
precautions.
yPlease read it thoroughly to ensure safe operation.
yAlways keep the manual where it is readily available.
DC Axial Flow Fans
MD Series
AType (with alarm)
SType (without alarm)
EType (long-life)

2
Checking the product
Package contents
Verify that the items listed below are included.
Report any missing or damaged items to the branch or sales oce from which
you purchased the product.
Fan .......................................................................................1 unit
Instructions and Precautions for Safe Use ............1 copy
Checking the model name
Verify the model name of the purchased product against the model shown on
the name plate of the product.
Tell us the model name, product serial number, and manufacturing date shown
on the name plate when you contact us.
MD S 17 51 F H - 24
1 2 3 4 5 6 7 8 9 10
1 Series name MD: MD Series
2 Type
A: Atype (with alarm)
S: Stype (without alarm)
E: Etype (long-life)
3 Frame size
4 Frame thickness
5 Frame form F: Side cut
6 Identication code Y
7 Speed type H: High speed
Blank: Standard speed
8 Rated voltage 24: 24 VDC
9 Additional function L: Stall alarm (Atype, Etype)
Blank: Low-speed alarm (Atype only)
10 Reference number (Etype only) 2
Fan size
Installation
Installation location
Install the product in the following location that provides easy access for
inspection.
yInside an enclosure installed indoors
yOperating ambient temperature: −10 to +60 °C [+14 to +140 °F] *
(non-freezing, non-condensing)
Operating ambient humidity: 20 to 85%*(non-condensing)
* The operating ambient temperature and operating ambient humidity vary
depending on the product. Check on the Oriental Motor Website for the
product specications.
yArea that is free of explosive atmosphere or toxic gas (such as sulfuric gas) or
liquid
yArea not exposed to direct sun
yArea free of excessive amount of dust, iron particles or the like
yArea not subject to splashing water (rain, water droplets), oil (oil droplets) or
other liquids
yArea not subject to continuous vibration or excessive shocks
yArea free of radioactive materials, magnetic elds or vacuum
yArea free of excessive electromagnetic noise (from welders, power machinery,
etc.)
When using near a switching circuit or high-frequency power supply, the
induced current may ow inside the fan due to electromagnetic noise
(conductive noise, radiative noise). If the induced current ows, the electric
corrosion is caused in the bearings of the fan. As a result, it may generate
the noise or shorten the service life of the products. Use the fan in the
environment that the electromagnetic noise does not cause.
Installation method
yInstall the fan onto an appropriate at metal plate having excellent vibration
resistance and heat conductivity.
yDrill mounting holes in equipment, and secure the fan using screws.
yFor directions of the air ow and blades rotation, see the arrow indicated on
the side of the fan frame.
yFinger guards that can prevent ngers and foreign particles from entering are
available as peripheral equipment (sold separately). Install as shown in the
gure when using.
Finger guard
(sold separately)
Mounting screws
(not supplied)
Fan size Screw size Tightening torque
420 M3 0.4 N·m (3.5 lb-in)
515*1, 625*2, 825, 925, 1225, 1238,
1451, 1751 M4 0.6 N·m (5.3 lb-in)
*1 When the nger guard is used, the screw size and tightening torque are M3 and
0.4 N·m (3.5 lb-in), respectively.
*2 The screw size and tightening torque of MDA625-24 are M3 and 0.4 N·m
(3.5 lb-in), respectively.

3
Connection
Connecting the power supply
The fan starts rotating when the DC power supply is turned on.
Verify the voltage specication with the nameplate of the product, and input
the suitable voltage.
For the Atype fans, use the DC power supply whose rise time is 100 ms or less.
Note A voltage applied to the fan may be higher than the output voltage of
the DC power supply depending on the wiring distance between the
fan and the DC power supply. Use the fan in a state where a voltage
applied to the fan does not exceed the voltage specication.
[Connection diagram]
DC power supply
for driving
+
– (GND)
Alarm output (Atype, E
type)
Red
Black
Yellow or orange
Grounding (Fan size 1451 only)
yLead wire size: AWG24*
* The lead wire size of MDA420, MDS420, MDA515, MDS515, and MDA925-
24L fans are AWG26.
yConnecting Protective Earth Terminal
Ground using the Protective Earth Terminal provided on the product.
Connecting the alarm circuit
zStall alarm (Atype, Etype)
If the fan stops rotating while the power is supplied, an alarm signal is output.
The yellow lead wire or the orange lead wire is for alarm signal. GND of the DC
power supply for driving and that of the alarm signal are common.
yOutput circuit: Open-collector output
yOutput status: L level when the fan rotates (internal transistor ON)
H level when the fan stops (internal transistor OFF)
Connection diagram Delay function
Yellow
or
orange
Black
Fan User's circuit
GND
27.6 VDC or less*
R
0 V
5 mA
or less
To avoid an alarm detection
when the fan starts rotating,
a delay function is required
externally. The delay time
should be at least one second.
* 30 VDC or less for MDA1451, MDE1225, MDE1238, MDE1451
zLow-speed alarm (Atype only)
An alarm signal is output when the speed of the fan falls the“alarm activation
speed” or lower.
The yellow lead wire is for alarm signal. GND of the DC power supply for driving
and that of the alarm signal are common.
yOutput circuit: Open-collector output
yOutput status: L level when the fan rotates normally (internal transistor ON)
H level when an alarm is output (internal transistor OFF)
Model Connection diagram
Alarm
activation
speed
[r/min]
Delay function
MDA625
MDA825
Yellow
Black
Fan User's circuit
GND
30 VDC or less
R
0 V
15 mA
or less
2300 ± 400
or less
To avoid an
alarm detection
when the fan
starts rotating,
a delay function
is required
externally.
The delay
time should
be at least ten
seconds.
MDA925 1900 ± 400
or less
MDA1225 Yellow
Black
Fan User's circuit
GND
30 VDC or less
R
0 V
15 mA
or less 2100 ± 400
or less
The fan is
equipped with
an internal
starting-delay
circuit. The
alarm function
is enabled
within ten
seconds after
the fan starts
rotating.
MDA1238
Yellow
Black
Fan User's circuit
GND
30 VDC or less*
R
0 V
15 mA
or less*
2200 ± 220
or less
MDA1451
MDA1751
1800 ± 400
or less
* 28 VDC or less and 10 mA or less for MDA1238
Overheat protection for locked condition
This fan is equipped with a built-in burnout prevention circuit. Since this
circuit automatically controls the current ow to the windings when a locked
condition is detected, it prevents the fan from burning out. The fan resumes
operation automatically as soon as it is released from the locked condition. Turn
o the power at the time of inspections.

4
yUnauthorized reproduction or copying of all or part of this manual is
prohibited.
yCharacteristics, specications and dimensions are subject to change without
notice.
yand are registered trademarks or trademarks of
Oriental Motor Co., Ltd., in Japan and other countries.
© Copyright ORIENTAL MOTOR CO., LTD. 2023
Published in December 2023
Technical Support Tel:[phone]
8:30am EST to 5:00pm PST (M-F)
• Please contact your nearest Oriental Motor oce for further information.
Schiessstraße 44, 40549 Düsseldorf, Germany
Technical Support Tel:[phone]
Unit 5 Faraday Oce Park, Rankine Road,
Basingstoke, Hampshire RG24 8QBUK
Tel:[phone]
Tel:[phone]
Tel:[phone]
4-8-1Higashiueno,Taito-ku,Tokyo 110-8536
Japan
Tel:[phone]
www.orientalmotor.co.jp/ja
Tel:[phone]
Tel:[phone]
Singapore
Tel:[phone]
Tel:[phone]
Tel:[phone]
Korea
Tel:[phone]
Tel:[phone] (For English)
1800-121-4149 (For Hindi)
Inspection and maintenance
Inspection
It is recommended that periodic inspections for the items listed below are
conducted after each operation.
If an abnormal condition is noted, discontinue any use and contact your nearest
Oriental Motor sales oce.
zInspection item
yCheck if any of the mounting screws of the fan is loose.
yCheck if the fan generates unusual noises.
Warranty
Check on the Oriental Motor Website for the product warranty.
Disposal
Dispose the product correctly in accordance with laws and regulations, or
instructions of local governments.
Specications
Check on the Oriental Motor Website for the product specications.
Regulations and standards
UL Standards, CSA Standards, EN Standards
This product is recognized by UL under the UL, CSA and EN Standards.
Thermal class UL/CSA Standards: 105(A) EN Standards: 120 (E)
EN Standards: Some products are certied by TÜV or DEMKO.
The applicable standards and certication bodies vary depending on the
product.
Check on the Oriental Motor Website for details.
zInstallation conditions (EN/IEC Standards)
For incorporating in equipment
Overvoltage category:Ⅰ(Excluding DEMKO)
Pollution degree: 2
Protection against electric shock: ClassⅢequipment
CE Marking
Some products are axed the CE Marking under the EMC Directive.
Caution: This equipment is not intended for use in residential environments
nor for use on a low-voltage public network supplied in residential
premises, and it may not provide adequate protection to radio
reception interference in such environments.
RoHS Directive
This products do not contain the substances exceeding the restriction values.
Republic of Korea, Radio Waves Act
KC Mark is axed to some product under the Radio Waves Act, the republic of
Korea.