8
7
S
Error Codes
When the Motor Protection Circuit stops the motor due to some system failure, such as overload,
wire breakage, misuse or circuit problems, the Speed Display
e
will display an Error Code.
S
Fuse Replacement
Fuses are located in the Power Connector Assembly
@3
.
Depress the spring tabs located on the top and bottom of the
Power Connector Assembly and remove it to change the fuses.
(T1.6AH250V for 120V, T300mAH250V for 230V). (
Fig. 7
)
NOTE
Please make sure to replace fuses with the same rated 'Slow Blow' or 'Time Delay' type
fuses. Failure to replace with the proper type fuse will result in continuous fuse failures or
damage to the unit and motor.
CAUTION
Fuses blow only when a short circuit or voltage spike on the AC Iine occurs. If you are
uncertain of the cause for a fuse failing, send the unit to an authorized NAKANISHI
service shop for repair.
Fig. 7
23
For solutions to the error codes please see the Troubleshooting Section of this manual.
S
Maintenance Mode
This system incorporates a maintenance mode to check the function of the switches, display, foot
pedal, motor, and etc. To activate the Maintenance Mode press and hold the FIXPEED Switch
!0
and
Motor Switch A
u
simultaneously and turn the Power Switch
!5
on. Hold the buttons until the unit
'beeps' (about 2 seconds). With maintenance mode activated the Speed Control Knob
w
will switch
between function checks and the function will be displayed in the Speed Display
e
. The check will
be displayed in the following order from lowest speed setting "oP", "dP", "HL", "Pd" and "in"
To release Maintenance Mode, turn the unit off and on again.
Function Checks are as follows
1. [oP] : Switch operation check
Press the switch on the panel you wish to check and the light on the panel will light to indicate
proper operation of the switch.
2. [dP] : Display check
Press the Forward/Reverse Selector Switch
t
, and the LEDs will light one by one to verify their
normal operation. To cancel this test press the Forward/Reverse Selector Switch
t
again.
3. [HL] : Motor Signal check (Hall IC check)
Press the Forward/Reverse Selector Switch
t
and the Speed Display
e
will display one or two
horizontal lines. Turn the motor slowly by hand and the display will show one line, two lines, one
line, two lines,...smoothly from top to bottom to top. If any one of these three lines does not light,
the sensor (Hall IC) is bad or the signal line in the motor cord is cut. Please send the unit and
motor for repair. To cancel this check, press the Forward/Reverse Selector Switch
t
again.
4. [Pd] : Foot Pedal check
Press the Forward/Reverse Selector Switch
t
, and the Speed Display
e
will display
alphanumeric characters (0-9, A-F) according to the degree of depression of the Foot Pedal
!7
.
Also depressing the foot pedal slightly lights the Motor A LED
i
and depressing it fully
extinguishes the LED. If the Speed Display
e
does not change smoothly or the Motor A LED
i
does not light properly, the Foot Pedal
!7
may be bad. To cancel this check, press the Forward/
Reverse Selector Switch
t
again,
5. [in] : Initializing Function
Press the Forward/Reverse Selector Switch
t
until a 'beep' is heard. The settings for rotation
direction and other settings will be reset to factory defaults.
Rotation Direction : FWD (Forward)
Motor Selector Switch : A
FIXPEED : 20,000min
-1
Error cord
Description
Cause
E 0
Self-check error
• Abnormal internal memory
• Broken internal memory
E 2
Overvoltage detection error
• Shorted cord (power line),damaged circuit
• Broken internal circuit
E 4
Unit overheat error
• Temperature rise in the unit due to longtime use at a high load
• Unit placed under high temperature
E 5
PAM circuit error
• Abnormal voltage generated in start / stop circuit
• Faulty start / stop circuit from PAM(L Slide)
E F
Foot pedal error
• Faulty Foot Pedal or Shorted Foot Pedal cord
• Broken internal circuit
E 6
Rotor lock error
• Open chuck
• Faulty handpiece
• Motor Faulty
• Faulty sensor (Hall IC)
• Severed cord (signal, power line)
E 1
Overcurrent detection error
(Hard)
• Long-time use at a high load (overcorrect)
• Shorted cord (power line)
• Shorted motor winding
E 3
Motor sensor error
• Faulty sensor (Hall IC)
• Disconnected motor cord
• Severed cord (signal line)
E 8
Overvoltage detection error
(Soft)
• Long-time use at a high load (overcorrect)
• Shorted cord (power line)
• Shortstop of the motor winding
E 9
ITRIP error
• Faulty motor and circuit
