Oriental motor PK Series User manual

Thank you for purchasing an Oriental Motor product.
This Operating Manual describes product handling procedures and safety precautions.
•Please read it thoroughly to ensure safe operation.
•Always keep the manual where it is readily available.
HM-7471
2-Phase/5-Phase Stepping Motors
PK Series
OPERATING MANUAL
1 Introduction ................................... 2
2 Safety precautions ........................ 3
3 Precautions for use........................ 5
4 Preparation..................................... 6
5 Connection ..................................... 8
6 Installation.................................... 10
7 Inspection and maintenance .... 12
8 Specications ............................... 13
9 General specications ................ 14
10 Regulations and standards........ 15

Introduction
2
1 Introduction
1-1 Before using the product
Only qualied personnel of electrical and mechanical engineering should work with the product.
Use the product properly after thoroughly reading the section“2 Safety precautions”on p.3. In addition, be sure
to observe the contents described in warning, caution, and note in this manual.
The product described in this manual is designed and manufactured to be incorporated in general industrial
equipment. Do not use it for any other purpose. Oriental Motor Co., Ltd. is not responsible for any compensation for
damage caused through failure to observe this warning.

Safety precautions
3
2 Safety precautions
The precautions described below are intended to ensure the safe and proper 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.
Description of signs
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.
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.
•Do not use the product in explosive or corrosive environments, in the presence of ammable gases, in
places subjected to splashing water, or near combustibles. Doing so may result in re or injury.
•Do not forcibly bend, pull, or pinch the motor lead wires or cable. Doing so may result in re.
•Do not disassemble or modify the product. Doing so may result in injury.
•Assign 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.
•When using the product in a vertical drive such as elevating equipment, be sure to take a measure to
hold the moving part in position. Failure to do so may result in injury or damage to equipment.
•Install the product in an enclosure. Failure to do so may result in injury.
•Connect the product securely according to the connection diagram. Failure to do so may result in re.
•Use a DC power supply with reinforced insulation on its primary and secondary sides for a power
supply. Failure to do so may result in electric shock.

Safety precautions
4
•Do not use the product beyond the specications. Doing so may result in injury or damage to
equipment.
•Keep ngers and objects out of the openings in the product. Failure to do so may result in re or injury.
•Do not touch the product during operation or immediately after stopping. The surface is hot, and this
may cause a skin burn(s).
•Do not lift the motor by holding the output shaft, motor lead wire or cable. Doing so may result in
injury.
•Keep the area around the product free of combustible materials. Failure to do so may result in re or a
skin burn(s).
•Do not leave anything around the product that would obstruct ventilation. Doing so may result in
damage to equipment.
•Do not touch the rotating part (output shaft) during operation. Doing so may result in injury.
•Provide a cover over the rotating part (output shaft) of the motor. Failure to do so may result in injury.
•Use a motor and driver only in the specied combination. An incorrect combination may cause a re.
•Provide an emergency stop device or emergency stop circuit external to the equipment so that the
entire system will operate safely in the event of a system failure or malfunction. Failure to do so may
result in injury.
•If any abnormality is observed, stop operation immediately to disconnect the power supply. Failure to
do so may result in re or injury.
•The motor surface temperature may exceed 70 °C (158 °F) even under normal
operating conditions. If the operator is allowed to approach the motor during
operation, ax a warning label on a conspicuous place as shown in the gure. The
surface is hot, and this may cause a skin burn(s). Warning label

Precautions for use
5
3 Precautions for use
zWhen conducting the insulation resistance measurement or the dielectric strength test, be sure to
separate the connection between the motor and the driver.
Conducting the insulation resistance measurement or the dielectric strength test with the motor and driver
connected may result in damage to the product.
zUse the motor in a condition where a radial load and an axial load are equal to or less than the
permissible values.
Continuing to operate the motor under excessive radial load or axial load may cause damage to the bearings (ball
bearings). Be sure to operate the motor within the specied values for the radial load and the axial load.
zMotor surface temperature
The surface temperature of the motor case may exceed 100 °C (212 °F) depending on operating conditions such as
ambient temperature, operating speed, operating duty, and others. To prevent the bearings (ball bearings) from
reaching the end of their useful life prematurely, use the motor in a condition where the surface temperature of the
motor case does not exceed 100 °C (212 °F).

Preparation
6
4 Preparation
4-1 Checking the product
Verify that the items listed below are included. Report any missing or damaged items to the Oriental Motor sales
oce from which you purchased the product.
•Motor .............................................................................. 1 unit
•Connection cable [0.6 m (2 ft.)] . ...........................1 piece*
•Instructions and Precautions for Safe Use .........1 copy
* Included with PKE24-L.
4-2 How to identify the product model
Check the model name of the motor against that shown on the nameplate. Refer to“4-3 Information about
nameplate” on p.7 for how to identify the nameplate.
2-Phase
PK2 4 3 M D 15 A
1234 5 67
1 Motor frame size
4: 42 mm (1.65 in.)
5: 50 mm (1.97 in.)
6: 56.4 mm (2.22 in.)*
9: 85 mm (3.35 in.)
2 Motor length
3 Motor type
Blank: Standard type
M: High-resolution type
J: High-torque type
4 Number of lead wires
Blank: 6 Leads
D: 4 Leads
-E or -F: 8 Leads
5A value indicating the specications of the motor windings may be entered.
Example: -01, 15, 2.0
6 Shape A: Single shaft
B: Double shaft
7 Motor identication A: Products for USA
* 60 mm (2.36 in.) for PK26J
2-Phase (High-torque/High-eciency type)
PKE2 4 3 D A
12345
1 Motor frame size 4: 42 mm (1.65 in.)
2 Motor length
3 Number of lead wires Blank: 6 Leads
D: 4 Leads
4 Shape A: Single shaft
B: Double shaft
5 Connection cable -L: With connection cable
Blank: Without connection cable

Preparation
7
5-Phase
PK5 6 4 H - A
123 45
1 Motor frame size
4: 42 mm (1.65 in.)
6: 60 mm (2.36 in.)
9: 85 mm (3.35 in.)
2 Motor length
3 Motor type Blank: Standard type
H: High-speed type
4 Shape A: Single shaft
B: Double shaft
5 Motor identication
4-3 Information about nameplate
The gure shows an example.
Motor model
Specications
Serial number Manufacturing date
The position describing the information may vary depending on the product.

Connection
8
5 Connection
5-1 Notes when the connection cable is used
(connector-coupled type only)
When inserting the connector
Hold the connector body, and insert it straight and securely. Inserting the connector while it is tilted may cause
damage to the terminals or a connection failure.
When pulling out the connector
Pull out the connector in straight while releasing the lock part of the connector. Pulling out the connector while
holding the lead wires may cause damage to the connector.
Bending radius of cable
Use the cable in a condition where the bending radius of the cable is more than four times the diameter of the lead
wire.
Do not excessively bend the motor lead wire near the connection part of the connector. Applying stress on the motor
lead wire may cause poor contact or disconnection, resulting in malfunction or heat generation.
Bend excessively
Have length allowances
More than 4 times
the lead wire diameter
Fix the motor lead wires of the connection part of the connector so that no stress is applied to the
connector or the terminals by bending the lead wires or their own weight.

Connection
9
5-2 Connection diagram
Connector-coupled type (PKE24)
The pin numbers of the connector and the lead wire colors of the Oriental Motor connection cable are shown in the
gures.
z6 Lead wires type
A
A
BB
(4)Black
(
5)Yellow
(
6)Green
Red
(3)
White
(2)
Blue
(1)
z4 Lead wires type
The pins No.2 and No.5 are not used.
A
B
(4)Black
(6)Green
Red
(3)
Blue
(1)
zPin arrangement
(6)(5)(4)(3)(2)(1)
zApplicable connector and lead wire
Type Part number
Connector housing 51103-0600 (Molex, LLC)
Contact 50351-8XXX (Molex, LLC)
Designated crimp tool 63811-8100 (Molex, LLC)
Applicable lead wire
•Wire size: AWG28 to 22 (0.08 to 0.3 mm2)
•Outer diameter of wire insulation: ø1.15 to 1.8 mm (0.045 to 0.071 in.)
•Stripping length of wire insulation: 2.3 to 2.8 mm (0.091 to 0.11 in.)
Lead wire type (2-Phase)
The lead wire colors are shown in the gures.
zUnipolar
6 Lead wires type
A
A
BB
Black
Green
Red White Blue
Yellow
zBipolar
4 Lead wires type
A
B
Black
Green
Red
Blue
z8 Lead wires type
A
A
B B
Black
Green
Red White Blue
Yellow
Brown
Orange
Lead wire type (5-Phase)
The lead wire colors are shown in the gure.
AE
B
C
D
Black
Green
Red
White
Blue
Yellow
Brown
Orange
Gray
Purple

Installation
10
6 Installation
6-1 Installation location
The motor is designed and manufactured to be incorporated 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 +50 °C [+14 to 122 °F] (non-freezing)
•Operating ambient humidity: 85 % or less (non-condensing)
•Area free of explosive atmosphere, 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 (rain, 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 elds, or vacuum
•Up to 1,000 m (3,300 ft.) above sea level
6-2 Installation method
Install the motor onto an appropriate at metal plate having excellent vibration resistance and heat conductivity.
When installing the motor, use all mounting holes to secure the motor with screws (not included) so that there is no
gap between the motor and the metal plate.
zInstallation method 1
Mounting holes
Metal plate
Flange pilot
zInstallation method 2
Flange pilot
Metal plate
Mounting holes
zScrew size, tightening torque, installation method
The values of the tightening torque are recommended. Tighten the screws to an appropriate torque according to the
design conditions of the metal plate to be installed.
Model Screw size Tightening torque
[N•m (oz-in)]
Eective depth of
screw thread
[mm (in.)]
Installation method
PK54, PK24, PKE24 M3 P0.5
No.4-40UNC* 1 (142) 4.5 (0.18) 1
PK56, PK25, PK26 M4
No.8-32UNC 2 (280)
− 2
PK59, PK29 M5
No.10-24UNC 3 (420)
* Products for USA
6-3 Installing a load
When installing a load on the motor, align the shaft center lines of the output shaft and the load. When installing a
coupling or pulley on the output shaft, do not damage to the output shaft or the bearing.

Installation
11
6-4 Permissible radial load and permissible axial load
Make sure that the radial load and axial load applied to the output shaft do not exceed the permissible values shown
in the table below.
Model
Permissible radial load [N (lb.)]
Permissible axial load
[N (lb.)]
Distance from output shaft end [mm (in.)]
0 (0) 5 (0.20) 10 (0.39) 15 (0.59) 20 (0.79)
PK54
PK24
PKE24
20 (4.5) 25 (5.6) 34 (7.6) 52 (11.7) − 10 (2.2)
PK56 63 (14.1) 75 (16.8) 95 (21) 130 (29) 190 (42)
20 (4.5)
PK25
PK26 54 (12.1) 67 (15.0) 89 (20) 130 (29) −
PK26J50 (11.2) 60 (13.5) 75 (16.8) 100 (22) 150 (33)
PK59
PK29 260 (58) 290 (65) 340 (76) 390 (87) 480 (108) 60 (13.5)

Inspection and maintenance
12
7 Inspection and maintenance
7-1 Inspection
It is recommended that periodic inspections are conducted for the items listed below after each operation of the
motor. If any abnormality occurs, discontinue use of the product and contact your nearest Oriental Motor sales oce.
Inspection item
•Check to see if any of the mounting screws of the motor are loose.
•Check to see if the bearing (ball bearings) of the motor generates unusual noises.
•Check to see if the motor lead wire is not damaged or stressed.
•Check to see if any of the connection parts with the connector or the driver are loose.
•Check to see if the output shaft and the load shaft are not misaligned.
7-2 Warranty
Check on the Oriental Motor Website for the product warranty.
7-3 Disposal
Dispose the product correctly in accordance with laws and regulations, or instructions of local governments.

Specications
13
8 Specications
Check on the Oriental Motor Website for the product specications.

General specications
14
9 General specications
Degree of protection IP20
Operating environment
Ambient
temperature −10 to +50 °C [+14 to +122 °F] (non-freezing)
Humidity 85 % or less (non-condensing)
Altitude Up to 1,000 m (3,300 ft.) above sea level
Surrounding
atmosphere
No corrosive gas or dust.
No exposure to water or oil.
Storage environment
Shipping environment
Ambient
temperature −20 to +60 °C [−4 to +140 °F] (non-freezing)
Humidity 85 % or less (non-condensing)
Altitude Up to 3,000 m (10,000 ft.) above sea level
Surrounding
atmosphere
No corrosive gas or dust.
No exposure to water or oil.
Insulation resistance 100 MΩ or more when 500 VDC megger is applied between the
the windings and the case.
Dielectric strength
Sucient to withstand the following between the windings and
the case for 1 minute.
•2-Phase
PK24, PKE24: 0.5 kVAC 50/60 Hz
PK25, PK26, PK29: 1.0 kVAC 50/60 Hz
•5-Phase
PK54: 0.5 kVAC 50/60 Hz
PK56, PK59: 1.0 kVAC 50/60 Hz

15
10 Regulations and standards
10-1 RoHS Directive
This product does not contain the substances exceeding the restriction values.

• Please contact your nearest Oriental Motor oce for further information.
Technical Support Tel:[phone]
8:30am EST to 5:00pm PST (M-F)
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] Tel:[phone]
Tel:[phone]
Singapore
Tel:[phone]
Tel:[phone]
Tel:[phone]
Korea
Tel:[phone]
4-8-1 Higashiueno, Taito-ku, Tokyo
110-8536 Japan
Tel:[phone]
www.orientalmotor.co.jp/ja
Tel:[phone] (For English)
1800-121-4149 (For Hindi)
•Unauthorized reproduction or copying of all or part of this manual is prohibited.
If a new copy is required to replace an original manual that has been damaged or lost, please contact your nearest Oriental
Motor sales oce.
•Oriental Motor shall not be liable whatsoever for any problems relating to industrial property rights arising from use of any
information, circuit, equipment or device provided or referenced in this manual.
•Characteristics, specications and dimensions are subject to change without notice.
•While we make every eort to oer accurate information in the manual, we welcome your input. Should you nd unclear
descriptions, errors or omissions, please contact the nearest oce.
•is a registered trademark or trademark of Oriental Motor Co., Ltd., in Japan and other countries.
Other product names and company names mentioned in this manual may be registered trademarks or trademarks of their
respective companies and are hereby acknowledged. The third-party products mentioned in this manual are recommended
products, and references to their names shall not be construed as any form of performance guarantee. Oriental Motor is not
liable whatsoever for the performance of these third-party products.
© Copyright ORIENTAL MOTOR CO., LTD. 2023
Published in November 2023