
Orange
Blue
Fan Client's circuit
R
GND 0 V
I
Vc: 30 VDC
or less
15 mA or less
Yellow
Black
Fan Client's circuit
GND
R
0 V
I
Vc: 30 VDC
or less
5 mA or less
∗
∗
MDS1751-24SH = 10 mA or less
Red
Black
DC power supply
+
GND
Yellow
Black
Fan Client's circuit
GND
R
0 V
I
Vc: 30 VDC
or less
5 mA or less
Connecting the power supply
Connect the red wire to the
positive (+) power supply and
the black wire to the ground
connection.
Check the voltage
specification on the product
identification plate and input the correct voltage.
Connection and specifications of the alarm/sensor
Pulse sensor type
The yellow wire is lead wire
for the pulse output. GND is
common to the sensor and
power supply. Connect these
wires to the client’s circuit as
shown in the figure below.
Two cycles of rectangular
waves are output per rotation.
Stall alarm, electronic alarm type
The yellow wire is lead wire
for the alarm circut. GND is
common to the sensor and
power supply. Connect these
wires to the client’s circuit as
shown in the figure below.
If the fan stalls while the
power is on, an alarm
signal (H level) is output.
Standard type
MDS1751-24H,MDS1451-24H,MDS1451-48H,
MDS1225-12H,MDS1225-24H,MD1225-12H,
MD1225-24H,MD925A-12H,MD925A-24H,
MD825B-12H,MD825B-24H,MD625B-12H,
MD625B-24H,MDS510-12H,MDS510-24H,
MDS510M-5H,MDS410-12H,MDS410-24H,
MDS410M-5H
Installation
Location for installation
The fan is designed and manufactured for installation in
equipment.
Install it in a well-ventilated location that provides easy
access for inspection. The location must also satisfy the
following conditions:
• Inside an enclosure that is installed indoors (provide vent holes)
• Operating ambient temperature
-
10 to +60 °C (+14 to +140 °F) (non-freezing)
• Operating ambient humidity 85%, maximum (non-condensing)
• Area that is free of explosive atmosphere or toxic gas
(such as sulfuric gas) or liquid
• Area not exposed to direct sun
•
Area free of excessive amount of dust, iron particles or the like
• Area not subject to splashing water (rains, water
droplets), oil (oil droplets) or other liquids
• Area free of excessive salt
• Area not subject to continuous vibration or excessive shocks
• Area free of excessive electromagnetic noise (from
welders, power machinery, etc.)
• Area free of radioactive materials, magnetic fields or vacuum
How to install the fan
Install the fan onto an appropriate flat metal plate having
excellent vibration resistance and heat conductivity.
See the panel cut-out, mounting-hall reference drawing for
information on how to provide mounting holes on the
equipment used and secure the fan with screws (not
supplied). For air orientation and rotational direction, see
the outline drawings in the catalogue.
Note
The stall alarm type of fan is not equipped with a delayed trip-
point alarm circuit. Therefore, an external delay function is
necessary to avoid the detection of fan start. The set time of
the delay function should be at least one second.
Low-speed alarm, electronic alarm type
The orange and blue
wires are lead wires for
the alarm circuit.
Connect these wires to
the client’s as shown in
the figure below.
An alarm (H level) signal
is output when the fan’s
rotation speed falls below 2100±400 r/min.
Low-speed alarm, contact alarm type
The orange and blue wires
are lead wires for the alarm
circuit. Connect these
wires to the client’s circuit
as shown in the figure.
An alarm (H level) signal
is output when the fan’s
rotation speed falls below 1800±400 r/min.
Note
The low-speed alarm type of fan is equipped with an
internal delayed-start alarm circuit. The alarm function
becomes effective within 10 seconds of the fan start.
Overheat protection
The fan is equipped with an internal protective circuit
against overheating. In the event a lock-up condition is
detected, this function automatically controls the current
flow to the fan motor’s windings, thus preventing the fan
blades from locking and burning out.
The fan resumes operation automatically as soon as it is
released from the locked condition. Be sure to shut off the
power to the fan before performing an inspection.
• Unauthorized reproduction or copying of all or part of this
Operating Manual is prohibited.
• Characteristics, specifications and dimensions are subject
to change without notice.
• While we make every effort to offer accurate information in
the manual, we welcome your input. Should you find
unclear descriptions, errors or omissions, please contact
the nearest office.
•is a trademark of Oriental Motor Co., Ltd.
is a trademark of Oriental Motor Co., Ltd., and is
registered in Japan and other countries.
Copyright ORIENTAL MOTOR CO., LTD. 2006
• Please contact your nearest Oriental Motor office for further information.
ORIENTAL MOTOR U.S.A. CORP.
Technical Support Line Tel:(800)468-3982
vailable from 7:30 AM to 5:00 PM, P.S.T.
E-mail: techsupport@orientalmotor.com
www.orientalmotor.com
ORIENTAL MOTOR (EUROPA) GmbH
Headquarters and Düsseldorf Office Tel:0211-5206700 Fax:0211-52067099
Munich Office Tel:08131-59880 Fax:08131-598888
Hamburg Office Tel:040-76910443 Fax:040-76910445
ORIENTAL MOTOR (UK) LTD. ORIENTAL MOTOR (FRANCE) SARL
Tel:01256-347090 Fax:01256-347099 Tel:01 47 86 97 50 Fax:01 47 82 45 16
ORIENTAL MOTOR ITALIA s.r.l. TAIWAN ORIENTAL MOTOR CO., LTD.
Tel:02-93906346 Fax:02-93906348 Tel:(02)8228-0707 Fax:(02)8228-0708
SINGAPORE ORIENTAL MOTOR PTE. LTD.
Tel:(6745)7344 Fax:(6745)9405
ORIENTAL MOTOR (MALAYSIA) SDN. BHD.
Tel:(03)79545778 Fax:(03)79541528
INA ORIENTAL MOTOR CO., LTD.
KOREA
Tel:(032)822-2042~3 Fax:(032)819-8745
ORIENTAL MOTOR CO., LTD.
Headquarters Tokyo, Japan
Tel:(03)3835-0684 Fax:(03)3835-1890 Printed on Recycled Paper
Orange
Blue
Fan
Client's circuit
R
Vc: 30 VDC
or less
0 V
I
30 mA or less
Connector housings/Contacts
Manufacturer: J.S.T. Mfg Co., Ltd.
Housings model: SMR-03V-N (3 poles), SMR-04V-N (4 poles)
Contacts model: SYM-001T-P0.6
Model
MDS1751 type, MDS1451 type,
MDS1225 type, MD1225 type,
MD925A type, MD825B type
MD625B type, MDS510 type,
MDS410 type
Screw size
M4
M3
Tightening torque
0.6 N·m
(5.3 lb-in)
0.4 N·m
(3.5 lb-in)