Vexta PMC33B3, PMC33A3, PMC35A3, PMC33A1-MG20, PMC33A1-MG10 Operating Manual

HP-7420-4

Compact & Lightweight Stepping Motor and Driver Package

PMC Series

• Standard Type

• MG Geared Type

• Harmonic Geared Type

OPERATING MANUAL

Table of Contents

Safety precautions................................. Page 2

Product verification ................................ Page 5

Names and function of driver parts ....... Page 7

Installation.............................................. Page 9

Driver function swithces ........................ Page 15

Input/output signals ............................... Page 16

Connections........................................... Page 22

Motor current adjustment ...................... Page 24

Troubleshooting..................................... Page 27

Specifications......................................... Page 30

Installing and wiring in compliance........ Page 33

with EMC directive

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.

1

Safety precautions

Only qualified personnel should work with the product.
Use the product correctly after thoroughly reading the section “Safety precautions.”
The precautions described below are intended to prevent danger or injury to the user and
other personnel through safe, correct use of the product. Use the product only after
carefully reading and fully understanding these instructions.

Warning

Handling the product without observing the instructions that accompany a “Warning”
symbol may result in serious injury or death.

Caution

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.

Warning

General

• Do not use the product in explosive or corrosive environments, in the presence of
flammable gases, locations subjected to splashing water, or near combustibles. Doing
so may result in fire or injury.

• Assign qualified personnel the task of installing, wiring, operating/controlling, inspecting
and troubleshooting the product. Failure to do so may result in fire or injury.

Installation

• Install the motor and driver in their enclosures in order to prevent injury.

Connection

• Keep the driver’s input-power voltage within the specified range to avoid fire.

• The driver power supply to be used should be a DC power supply where the primary
and secondary sides are provided with reinforced insulation. Otherwise, an electric
shock may occur.

• Connect the cables securely according to the wiring diagram in order to prevent fire.

• Do not forcibly bend, pull or pinch the cable. Doing so may fire.

2

Operation

• Turn off the driver power in the event of a power failure, or the motor may suddenly start
when the power is restored and may cause injury or damage to equipment.

• When you want to use the motor in a vertical application, take position holding
measures. When the power is turned off, the motor will lose the holding brake force.
The movable part will drop and possibly cause injury to personal and damage to the
equipment.

• Do not turn the output current off input to “ON” while the motor is operating. The motor
will stop and lose its holding ability, which may result in injury or damage to equipment.

Repair, disassembly and modification

• Do not disassemble or modify the motor or driver. This may cause injury. Refer all such
internal inspections and repairs to the branch or sales office from which you purchased
the product.

Caution

General

• Do not use the motor and driver beyond their specifications, or injury or damage to
equipment may result.

• Do not touch the motor or driver during operation or immediately after stopping. The
surfaces are hot and may cause a burn.

Transportation

• Do not hold the motor output shaft or motor cable. This may cause injury.

Installation

• Keep the area around the motor and driver free of combustible materials in order to
prevent fire or a burn.

• To prevent the risk of damage to equipment, leave nothing around the motor and driver
that would obstruct ventilation.

• The motor and driver should be firmly secured on the metallic plate in order to prevent
personal injury or equipment damage.

• Provide a cover over the rotating parts (output shaft) of the motor to prevent injury.

3

Operation

• Use a motor and driver only in the specified combination. An incorrect combination may
cause a fire.

• To avoid injury, remain alert during operation so that the motor can be stopped
immediately in an emergency.

• Before supplying power to the driver, turn all control inputs to the driver to “OFF.”
Otherwise, the motor may start suddenly and cause injury or damage to equipment.

• Make sure that the output power off input of the driver is turned on if you want to move
the motor shaft directly (e.g. for manual positioning). This caution is to prevent
personal injury.

• When an abnormality is noted, stop the operation immediately, or fire or injury may
occur.

Disposal

• When disposing of the motor or driver, treat them as ordinary industrial waste.

Note

Before using the product, read the content of the label carefully.
The content and stick position of the label are as follows.

ATTENTION

Please pay attention to the following
to the product work in the best
condition.

●Do not take the product out of the
protective bag until ready to use it.

●Do not touch parts and contacts to
avoid electrostatic damage.

●Do not expose the product to
vibration or shock.

●Keep the product away from dusty
and humid condition.

4

Protective bag

Driver

MNX7227

Product verification

Equipment checklist

• Motor........................................................................ 1

• Driver ....................................................................... 1

• M2.5 Cross recessed head machine screws
with washer for mounting the motor

(for only MG geared type)........................................ 4

• Connector for signals

6-173977-4 (AMP), 6-173977-8 (AMP).................... 2

• Connector for power supply

6-173977-3 (AMP) ................................................... 1

• Connector for motor connection

6-173977-5 (AMP) ................................................... 1

• Operating manual .................................................... 1

Note

Do not take the product out of the protective bag until ready to use it. Otherwise, the driver
may be damage.

Model numbers and motor/driver combinations

The PMC series is a combined package which includes a stepping motor and driver.
This operating manual is designated for the following products.

Package model number

PMC33A3

PMC33B3

PMC35A3

PMC35B3

PMC33A1-MG∗
PMC33B1-MG∗
PMC33A1-HG∗
PMC33B1-HG∗

1

1

2

2

Motor model number

PMM33A2

PMM33B2

PMM35A2

PMM35B2

PMM33A-MG∗
PMM33B-MG∗
PMM33A-HG∗
PMM33B-HG∗

1

1

2

2

Driver model number

PMD03CA

The box (∗1) represents the desired gear ratio (3.6, 7.2, 10, 20, 30, 50).
The box (∗

2

) represents the desired gear ratio (50, 100).

Note

The motor and the driver are precision equipment and should not be dropped or subject to
any physical shocks.

5

Interpreting the model number

P M C 3 3 A 3P M C 3 3 A 3

P M C 3 3 A 3

P M C 3 3 A 3P M C 3 3 A 3

Reference number

Shaft type

A：Single shaft
B：Double shaft

Motor case length

3：31mm (1.22in.)
5：50.5mm (1.99in.)

Motor frame size
 3：28mm (1.1in.) sq.

Compact & lightweight stepping motor and driver package

PMC series

P M C 3 3 A 1 - M G 3.6P M C 3 3 A 1 - M G 3.6

P M C 3 3 A 1 - M G 3.6

P M C 3 3 A 1 - M G 3.6P M C 3 3 A 1 - M G 3.6

Geared type

MG : MG gear
HG : Harmonic gear

Gear ratio

MG geared type

3.6: 3.6:1 20 : 20:1

7.2: 7.2:1 30 : 30:1
10 : 10:1 50 : 50:1

Harmonic geared type

50 : 50:1 100 : 100:1

Reference number

Shaft type

A：Single shaft
B：Double shaft

Motor case length 

Motor frame size
 3：28mm (1.1in.) sq.

Compact & lightweight stepping motor and driver package
PMC series

6

Names and functions of driver parts











Illustration shows the view from the connector side.

STEPPING DRIVER

CW/P.
CCW/D.
C.OFF
F/H

C.UP
TIM

BLU
RED
ORG
GRN
BLK

24 / 36V

GND

NC

1

+
+

CN1CN4CN3

+
+

+
+

+

1

1

1

CN2

SIGNAL 1

SIGNAL 2

MOTOR

POWER

①
②

③

④
⑤

LED indications

POWER

RUN

STOP

F

2P

VEXTA

H

1P

⑥

⑦

⑧

⑨

Indication

LED name

Color

① POWER Power input LED Green

Potentiometers and switches

Indication

② RUN

③STOP

④ F/H

⑤ 2P/1P

Name

Run potentiometer

Stop potentiometer

Step angle switch

Pulse input mode
switch

Factory

setting

0.35A/phase

0.175A/phase

F

1P

Current adjustment potentiometer used
when motor is running.
Motor standstill current adjustment
potentiometer used when current has
been cut back by the automatic current
cutback function when there is no pulse
input (motor standstill).
The motor step angle can be set to full
step or half step with this switch.
The pulse signal input mode can be set
to 1-pulse input mode or 2-pulse input
mode this switch.

Conditions when LED ON

Lights when the power is input.

Function

Page

reference

Page25

Page25, 26

Page15

Page15

7

Terminals

Indication Terminal name Function

⑥ SIGNAL 1
6-173977-8
(AMP)
∗1
The selection of
the pulse signal
input mode can
be set with the
pulse input
mode switch.
∗2
In this table, the
rotation direction
shows that of
motor output
shaft.
For harmonic
geared type and
gear ratio 10:1 of
MG geared type,
the motor rotation
direction is
opposite to the
output shaft
rotation direction.

⑦ SIGNAL 2
6-173977-4
(AMP)

⑧ MOTOR
6-173977-5
(AMP)

⑨ POWER
6-173977-3

(AMP)

8

Pin
No.

(Pulse/CW Pulse

CW/P.+

1

2

CW/P.

CCW/D.+

3

CCW/D.

4

C.OFF+

5

C.OFF

6

F/H+

7

F/H

8

C.UP+

1

2

C.UP

TIM+

3

TIM

4
1

2

Motor Connection Terminal

3
4
5

24/36V

1

GND

2
3

NC

Signal Input
Terminal)

(Pulse/CW Pulse
Signal Input

­Terminal)

(Rotation Direction/
CCW Pulse Signal
Input Terminal)

(Rotation Direction/
CCW Pulse Signal

­Input Terminal)

(All Windings Off
Signal Input
Terminal)

(All Windings Off
Signal Input

­Terminal)

(Step Angle Signal Input Terminal)

-

(Step Angle Signal Input Terminal)

(Automatic Current
Cutback Release
Signal Input Terminal)
(Automatic Current

-

Cutback Release
Signal Input Terminal)

(Excitation Timing
Signal Output Terminal)

(Excitation Timing

­Signal Output Terminal)

(Power Supply
Connection Terminal)
(Power Supply
Connection Terminal)

The pulse mode signal is input to this
terminal. The direction of the motor’s
rotation is determined by the following
rotation direction input terminal.
(When in 2-pulse input mode the CW
direction command pulse signal is input
to this terminal.)
The rotation direction signal is input to
this terminal. When a signal is input to
the terminal the motor output shaft will
rotate the counterclockwise direction.
(When in 2-pulse input mode the CCW
direction command pulse signal is input
to this terminal.)
The all windings off signal is input to this
terminal.
When a signal is input to the terminal the
driver will cut the power supply to the
motor.
The motor torque will then be reduced to
zero and the motor shaft can be rotated
freely for adjustment.
This function is used when manual
positioning etc. is required.
The motor step angle is input to this
terminal.
The automatic current cutback release
signal is input to this terminal.
Signal for deactivating the automatic
current cutback function, which cuts back
the output current to the motor when it is
standstill.

Signal indicating that the motor excitation
sequence is at step “0”.

Connect this terminal to the blue lead wire.
Connect this terminal to the red lead wire.
Connect this terminal to the orange lead wire.
Connect this terminal to the green lead wire.
Connect this terminal to the black lead wire.

Connect this terminal to a “+” side of
DC24V or DC36V and GND.

No connection.

Page

reference

Page16, 17

Page16, 17

Page18, 19

Page19

Page20

Page21

Page22, 23
Page22, 23
Page22, 23
Page22, 23
Page22, 23

Page22

Installation

Motor installation

Motor installation location







To prevent motor damage, install in a location with the following conditions.

• Indoors (The motor is designed and manufactured to be used as an internal component
within other equipment.)

• Ambient temperature range
For harmonic geared type: 0°C~+40°C (+32°F~+104°F) (non-freezing)

• Ambient humidity below 85% (non-condensing)

• No explosive, combustible, or corrosive gases

• No direct sunlight

• No dust or conductive particles (i.e. metal chips or shavings, pins, or wire fragments
etc.)

• No water, oil, or other fluids

• Where the motor is able to dissipate heat easily

• No continuous vibration or sudden shocks

• No nearby radiation, magnetic field, or air vacuum environment

How to install the motor







To allow for heat dissipation and to prevent vibration, be sure to securely attach the motor
to solid metal surface.
The motor flange incorporates a pilot diameter. Use this pilot diameter as a guide for
alignment when mounting the motor.

-

10°C~+50°C (+14°F~+122°F) (non-freezing)

PMC3A(B)3

M2.5
Spring washer

M2.5
Recessed cross
head screws

Spot facing or
through hole for pilot

Ø3(.12)-4holes

4-M2.5 P0.45

Mounting plate

9

PMC33A(B)1-MG

M2.5
Cross recessed
head machine
screws with
washer (attached)

Spot facing or
through hole for pilot

4-M2.5 P0.45

Ø3(.12)-4holes

Mounting plate

PMC33A(B)1-HG

M3
Spring washer

M3
Hexagonal
socket screws

Spot facing or
through hole for pilot

Ø3.5(.14)-4holes

4-M3 P0.5

Mounting plate

The following hardware (not supplied) is needed to mount the motor.
For the installation of the MG geared type, use the supplied screws.

PMC3A(B)3

PMC33A(B)1-HG

・M2.5 Recessed cross head screws : 4
・M2.5 Spring washers : 4

・M3 Hexagonal socket screws : 4
・M3 Spring washers : 4

Select screws with a length appropriate for the thickness of the mounting plate.
(Refer to the below table.)

Model

PMC33A(B)3
PMC35A(B)3

PMC33A(B)1-MG

PMC33A(B)1-HG

Length of the screws [Unit: mm (inch)]
thickness of the mounting plate +2.5 (0.1)
thickness of the mounting plate +3.5 (0.14)

thickness of the mounting plate +5 (0.2)

10

Motor mounting plate dimensions







［unit: mm (inch)］

PMC3A(B)3

Ø3(.12)-4holes

Ø5.5(.22)min.
Shaft hole

+0.033

+.0013

()

0

.87

0

Ø22
Spot facing or

through hole for pilot

23±0.2(.9±.008)

23±0.2(.9±.008)

X

X’

PMC33A(B)1-MG

Ø3(.12)-4holes

6±0.2(.2±.008)

X

Ø5.5(.22)min.
Shaft hole

R0.3(.01)max.

1.5(.059)min.

2(.08)min.

X-X’

R0.5(.02)max.

2(.08)min.

0

+.0013

.87

()

+0.033

0

Ø22

Ø11.5(.45)

23±0.2(.9±.008)

X’

23±0.2(.9±.008)

PMC33A(B)1-HG

X

23±0.2(.9±.008)

23±0.2(.9±.008)

X’

Ø11.5(.45)
Spot facing or
through hole for pilot

Ø3.5(.14)-4holes

Ø8.5(.33)min.
Shaft hole

+0.033

+.0013

()

0

.87

0

Ø22
Spot facing or
through hole for pilot

X-X’

R0.3(.01)max.

2(.08)min.

5(.2)min.

X-X’

2(.08)min.

0

+.0013

.87

()

+0.033

0

Ø22

11