Fanuc Power Mate i-D/H Maintenance Manual

6. AC SPINDLE (SERIAL INTERFACE)
B63175EN/03
396
3741 Max. spindle speed of gear 1 (1 to 9999) [min
1
]
3742 Max. spindle speed of gear 2 (1 to 9999) [min
1
]
3743 Max. spindle speed of gear 3 (1 to 9999) [min
1
]
3736 Upper limit of the output to the spindle motor
3735 Lower limit of the output to the spindle motor
Setting +
Spindle speed (upper limitńlower limit)
Max. spindle speed
4095
(1)Change the upper and lower limits as follows:
When gear change method A is used: Parameter 3736 = 4095,
parameter 3735 = 0
When gear change method B is used: Parameter 3751 = 4095,
parameter 3735 = 0
(2)Tuning the D/A converter offset
Specify zero as the spindle speed. Then, by using a digital multimeter,
adjust the following parameter so that the voltage at the test pin DA2
on the spindle amplifier printed circuit board is 0 mV.
S0; (Specify the command by MDI operation, then press the cycle start button.)
3731 Spindle speed (D/A converter) offset compensation value
(3)Tuning the D/A converter gain
Specify the maximum spindle speed of gear 1. Then, by using a digital
multimeter, adjust the following parameter so that the voltage at the
test pin DA2 on the spindle amplifier printed circuit board is 10.0 V.
Sxxxx ; (xxxx is the value set in parameter 3741.)
(Specify the command by MDI operation, then press the cycle start button.)
3741 Max. spindle speed of gear 1 (1 to 9999) [min
1
]
Usually a voltage is output from the D/A converter by only executing an
S command. However, the clockwise rotation command (M03) may be
required on some machines.
(4)If the output voltage is not correct, perform the following calculation,
and change the value of parameter 3730 to adjust the gain of the D/A
converter:
Setting +
10V
Measured voltage
(Current value of PRM 3730)
(5)Execute an S command again and confirm that the output voltage is
correct.
Restore the original parameter values.
6.2.1.3
Tuning S analog voltage
(D/A converter)

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