Oriental motor 4RK25GN-AM-115, 5RK40GN-AM-115, 4RK25GN-CME, 5RK40GN-CME Instructions Manual

HM-9030-2

Thank you for selecting ORIENTAL MOTOR products.
To ensure correct operations, please read these instructions
carefully before using this motor.

INSTRUCTIONS

Electromagnetic Brake Motors

Single Phase 115V, 60Hz 4RK25GN-AM-115, 5RK40GN-AM-115
Single Phase 220/240V, 50Hz 4RK25GN-CME, 5RK40GN-CME

These Electromagnetic Brake Motors are reversible motors with a built-in de-energized electromagnetic brake [Fail-Safe Brake].
These motors are designed for 115V, 60Hz or 220/240V, 50Hz power sources.

■Features

1. Employing a de-energized, electromagnetic brake, the brake is
activated upon power shut off. The motor stops immediately and
holds the load firmly.

2. Sufficient holding torque is obtained regardless to the motor speed or
the power source frequency.
[Holding brake torque: 4RK25 Type 13 oz-in(9.8N-cm), 5RK40
Type 20 oz-in(14.7N-cm)]

3. The overrun at motor shaft is approximately 2〜3 rotations.
(With no-load and motor power shut off simultaneously.)

■Connecting Diagrams

●Protection of the relay contacts

The motor switch (SW2) and the electromagnetic brake switch (SW3) emit sparks
when turned on and off. In order to protect the relay contacts.
CR circuit ( ) must be connected.

Co=0.1〜0.2μF 250WV:4RK25GN-AM-115,

5RK40GN-AM-115

500WV:4RK25GN-CME,

5RK40GN-CME

Ro=5〜200Ω, 1/4W minimum

●Switch Specifications

No. of switches

SW1
SW2
SW3
SW4

Switch specifications

Single Phase 115V

AC125V 3A

Minimum

Single Phase 220/240V

AC250V 1.5A

Minimum

Note

Move together

WHITE

Capacitor

STOP
RUN

CCW

CW

SW2*

Ro Co

SW1

GRAY

LINE

BLACK

Motor

Electro­magnetic
Brake

STOP
RUN

OFF
ON

SW3*

Ro Co

YELLOW

YELLOW

SW4

※SW2 and SW3 move together.

■Timing Chart

■Operations

●Run/Stop

1. Motor will rotate when SW2 and SW3 are switched simultaneously to
RUN (short circuit) switching SW4 to OFF (open).

2. When SW2 and SW3 are switched simultaneously to STOP (open),
the motor stops immediately by electromagnetic brake and holds the
load.

3. To rotate the motor shaft by hand during the motor stops, switch
SW4 to ON (short circuit). The electromagnetic brake is released
and the motor shaft can be rotate easily by hand.
(Always switch SW4 to OFF (open) when running and stopping the
motor. SW4 is not necessary when such a operation is not needed.)

●Direction of Rotation

To rotate the motor in a clockwise (CW) direction, switch SW1 to CW.
To rotate it in a counter-clockwise (CCW) direction, switch SW1 to
CCW.
The diagram shows the direction of rotation of the motor shaft as
viewed from the motor shaft end.

SW1

SW2

SW3

SW4

Motor

CW

ONOFF

CCW

RunStop Stop Stop

Brake Release

Run

Run

CW

CCW

CW

Stop Stop Stop

Run

Run

Stop
Load­Holding

Run

Brake

Release

Stop
Load­Holding

Stop
Load­Holding

■Gearhead Connection

Specially designed gearheads are available that can be easily coupled
directly to these motors.
Sufficient torque can be obtained while reducing the motor speed to the
required speed on the gearhead output shaft.

●Types of Gearhead

●The box(□) represents the desired gear ratio, which thereby becomes part of
the code for the gearhead.

●Gear Ratio:3, 3.6, 5, 6, 7.5, 9, 12.5, 15, 18, 25, 30, 36, 50, 60, 75, 90, 100,120,

150, 180

■Precautions for Connecting Gearhead to the Motor

1. Connecting Gearhead

As the figure to the right shows, motor and gearhead are put together
using the recessed areas on each unit as guides while gently turning
the gearhead back and forth for smooth engagement of gearing and
cog. Care should be taken not to damage the shaft by applying
excessively large force during attachment. Then use the mounting
screws that come with the gearhead to screw the gearhead onto the
motor until if fits snugly.

Note:Note that attempt to put motor and gearhead together by force or

entrapping of material like metal chips can result in damage to the geared
section of the shaft or the cog leading to abnormal noise and shortened
operating life. Assembly should be carried out with the necessary care.

2. Installation

Install the motor firmly to your equipment. The heat-sink effectiveness
and protection of vibration are required as much as possible. Useful
motor mountings are available separately.

3. Grounding

Any one of the mounting bolts may serve to fix the grounding wire to
the motor casing at the time of installation of the unit. If necessary,
remove all the bolt hamptom that may impede conductivity around the
bolt mounting hole.

■Precaution on Operation

●If the motor is ON continuously for a period of 30 minutes or more,

the rated temperature may be exceeded. Under no circumstances
should the temperature of the motor case be allowed to rise above
90

(194ºF).

●Use the motor in a place where the working ambient temperature is

−10

to 50 (14ºF to 122ºF) and humidity is 85％ less.

●Do not use the components in a place where a corrosive gas, water,
oil, dust and/or direct sunlight may contact the components.

●Avoid places where vibration/shocks are heavy and/or constant.

The geared section of the shaft

Edge of recessed area

Recessed area

Flange surface

Ground Wire

Motor Models

4RK25GN-AM-115
4RK25GN-CME
5RK40GN-AM-115
5RK40GN-CME

Gearhead Models

Inch size output shaft

4GN□KA

(Ball bearing type)

5GN□KA

(Ball bearing type)

Metric size output shaft

4GN□K

(Ball bearing type)

5GN□K

(Ball bearing type)

Inch size shaft gearhead Metric size shaft gearhead

Models

4GN□KA

5GN□KA

Shaft Diameter

0.375" dia.

(9.525mm dia.)

0.5" dia.

(12.7mm dia.)

Shape of

Shaft

Flat cutted

Flat cutted

Models

4GN□K

5GN□K

Shaft Diameter

10mm dia.

12mm dia.

Shape of

Shaft

Key slot

(Key provided)

Key slot

(Key provided)

●Size of Gearhead output shaft

■Trouble Shooting

Symptoms

Motor does
not turn

Motor turns
wrong
direction

Causes

No voltage coming to
motor

Electromagnetic brake is
ON

Load is too large
Motor is mis-wired

Gearhead is attached

Check Point

Check that motor has no loose­connection
Check that lead wires have no
interruption

Check that the electromagnetic brake is
released
Check that the electromagnetic brake
has been energized

Remove the load and check operation of
motor alone

Check the motor connection
Check the gear ratio

When connecting gearhead to reduce
the speed, the gearhead output shaft
can be made to rotate in an opposite
direction as the motor depending on
which speed reduction ratio is chosen.