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5

. CONNECTION OF MOTOR CORD

Before connecting to the Motor Cord  to the Motor and CONTROLLER, verify the Main Power 
Switch in the CONTROLLER is turned OFF. If the Main Power Switch on the CONTROLLER is 
ON while connecting the Motor Cord, damage to the CONTROLLER is possible.

Install the protective cover (Protective Cover etc.) to prevent damage or contamination to the 
Motor Cord Plug when not in use.

Remove the Protective Cover of the Motor Cord (Motor Power Line and Motor Signal Line).

Fig. 6

Carefully insert the Alignment Pin into the Alignment Hole and push straight into the Connector of the Motor 
Cord.

Fig. 8

Tighten the Coupling Nut with clockwise.

Fig. 9

Insert the air hose of the Motor Cord Side to the air joint of the Motor Side.

Fig. 10

Loosen the Fastening Screw (3 locations) of the Motor 
Cord Exit Housing.

Adjust the Motor Cord Exit Housing to the desired 
position.

Re-tighten the Fastening Screws (3 locations) of the 
Motor Cord Exit Housing.

4

.  POSITION ADJUSTMENT OF THE MOTOR CORD EXIT HOUSING (BLUE 

AREA) ON THE EM-

4020

A and EM-

4040

A

The Motor Cord Exit Housing (Blue Area) of the EM-4020A and EM-4040A can be adjusted by rotating to a desired 
position.

Fig. 5

7

. TROUBLESHOOTING

Make sure your hands and all interlocking parts of the spindle and motor are clean before 
connecting the motor to the spindle. This is critical in preventing contaminants from entering 
the motor or spindle.

Align the threads on the front end of the motor and the rear end of the spindle, then rotate the spindle clockwise. If 
the drive shaft of the motor does not engage the drive dog on the spindle,  it will not be possible for the spindle to 
rotate.  DO NOT FORCE THIS CONNECTION. Turn the spindle back a few threads, rotate the collet cap or spindle 
shaft slightly by hand until the drive shaft and the drive dog are fully engages.  This may take several attempts.  
Use the 36mm wrench that have been provided for the final tightening of the spindle to the motor.

Fig. 11

If a problem or concern occurs, please check the following prior to consulting your dealer.

Trouble

Cause

inspection / Corrective Action

Motor does not 
run.

Power is not supplied.

 Make sure to turn ON the Main Power Switch on 
the rear of the CONTROLLER.

 Connect the power cord correctly to the AC Power 
Input Terminal Block of the CONTROLLER.

Motor Cord Plug is not connected to 
the Motor and CONTROLLER.

Connect the Motor Cord plug correctly to the Motor 
and CONTROLLER.

Control Button (CTRL) is set to 
Manual mode but trying to start with 
an External Command Signal through 
Input / Output Connector A.

Start with the Start / Stop Button (START / STOP), or 
set the Control Button (CTLR) on the Control Panel 
to Auto mode.

Control Button (CTRL) is set to Auto 
mode but trying to manually start with 
the Start Button (START / STOP) on 
the Control Panel.

Start with an External Command Signal or set the 
Control Button on the Control Panel to Manual mode. 
(When Start with an External Command Signal, 
refer to  " 13 - 1 (1) Details of External Input / Output 
Connector A Signal Table 2 Pin No. 14 " section of 
the E4000 CONTROLLER Operation Manual. )

When using the E4000 Safety Relay 
Box, Emergency Stop Signal is OFF 
(Open).

Emergency Stop Signal is ON (Closed).

An Error has occurred. (Error LED is 
lit.)

Check the "Resetting System after Error Codes" of 
the E4000 CONTROLLER Operation Manual. Error 
will not be released until cause of the error has been 
removed.

Low air pressure.

Adjust to the air pressure 0.2 –  0.35MPa.

Can not  increase 
or decrease the 
speed of the
motor.

Motor Fixed Speed is set in 

 

parameter. Turn this Parameter OFF 
to allow rotational speed changes

Release parameter 

.

(Refer to " 15 - 4 

 

 Setting Fixed Motor Speed 

" section of the E4000 CONTROLLER Operation 
Manual.)

Can not set the  
motor speed to
its maximum
allowable speed.

Either the required speed value is 
higher than the maximum rotation 
speed of the motor, or the upper limit 
of the rotational speed has been set 
in parameter 

.

Set the  Maximum Rotation Speed to a value less 
than the Motor Rotation Speed set in Parameter 

.

Abnormal 
vibration or noise 
during rotation.

Cutting debris has contaminated the 
ball bearing.

Replace the ball bearings.
(Return to NAKANISHI dealer service.)

Low air pressure.

Adjust to the air pressure 0.2 –  0.35MPa.

2012.10.20   002 

CAUTION

Motor Cord Exit Housing (Blue Area) cannot 
be rotated more than 360 degrees. If forcibly 
rotated, the mechanical stop inside the Exit 
Housing will break and cause the base of the 
cord to kink, leading to internal damage of the 
cord.

Motor Cord Exit Housing
(Blue Area)

Fastening Screw

(3 locations)

Rotating Part

Turns 360

CAUTION

Protective Cover

Detach

Motor Power Line

Fig. 7

Protective Cover

Detach

Motor Signal Line

Motor Cord Side

Motor Side

Alignment Pin Alignment Hole

Tighten

Coupling Nut

Insert

6

. CCONNECTION TO THE SPINDLE

CAUTION

Tighten

Turn

Transmission Clutch

36

36

Refer to the E4000 CONTROLLER Operation Manual. 

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