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4. Torque Overload
When the Load Monitor LED (Load) [ 12 ] lights 4 or more LEDs (3 green LEDs and 1 or more
yellow LEDs) an overload condition exists. During overload operation the follow occurs.
(1) Warning LED (Warning) [ 20 ] flashes
(2) Warning Code A3 is displayed on the Digital Speed Indicator [ 11 ]
(3) Warning Signal is output to the Warning Signal (Warning) of Input/Output Connector
Overload operation is considered short term operation mode. The allowable operation time
depends on the number of lighted LEDs on the Load Monitor LED (Load).
The allowable time is detailed below.
(1) Load Monitor LED 4 LEDs : 30 Seconds
(2) Load Monitor LED 5 LEDs : 10 Seconds
(3) Load Monitor LED 6 LEDs : 5 Seconds
When the allowable time is exceeded the motor will stop and the following occurs.
(1) Error LED (Error) [ 19 ] flashes
(2) Error Code E8 is displayed in the Digital Speed Indicator [ 11 ].
(3) Error Signal is output to the error signal PIN8 (ERR) of Input/Output Connector A.
CAUTION
If you operate the system in short term operation for long periods of time the
control unit will overheat and damage to the motor and spindle is possible.
NAKANISHI recommends only continuous duty operation (Load LED has 3 LEDs lit :
Torque Load Monitor (Load) voltage is less than 5V.
BREAK-IN PROCEDURE
18
The E3200 Series is a high-precision, high-speed motor-spindle, the following procedure
must be followed to ensure proper operation and longevity.
During transportation, storage or installation the grease inside the bearings will settle. If the
motor-spindle is suddenly run at high-speed excessive heat will cause bearing damage. After
installation, repair, initial operation, or long periods of non operation please follow the break-
in procedure detailed in Table 4.
Table 4
Steps
1
2
min
-1
15,000
30,000
Running Time
15 Min
10 Min
No Abnormal
Spindle Housing no hotter than 20°C. If hotter
Noises
than 20°C stop for at least 20 minutes, check
Items to Check
installation and restart Break-In procedure.
33
3
4
5
40,000
50,000
60,000
10 Min
15 Min
10 Min
Spindle Housing less than
20°C.
CUTTING TOOL CAUTIONS
19
(1) The proper surface speed for vitrified grindstones is 600-1800m/min.
CAUTION
Do not exceed a surface speed of 2,000m/min for grinding.
Surface Speed (m/min)=
(2) Do not exceed 13mm overhang for mounted grindstones. In case overhang must exceed
13mm reduce the motor speed in accordance with Fig. 45 and Table 5.
(3) Do not use tools with bent or broken shanks, cracks or excessive runout.
(4) Dress the grindstone prior to use.
(5) For grinding the maximum depth of cut should not exceed 0.01mm radially or axially.
Reciprocate the tool several times after each in feed step.
(6) Always operate tools within the tool manufacturer's recommended speed limits. Use of a
tool outside of the manufacturer's recommended speed limits could cause damage to the
spindle and injury to the operator.
(7) Keep the tool shank and collet clean. If contaminants are left in the collet they can cause
excessive runout and damage the tool and spindle.
(8) Do not drop or hit spindle.
Table 5. Overhang and Speed
Overhang (mm)
20
25
50
N=Max. operating speed at 13mm overhang.
6
80,000
10 Min
3.14 x Diameter (mm) x rotation speed min
1,000
Speed (min
-1
)
N x 0.5
N x 0.3
13
N x 0.1
Fig. 45
-1
34
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