
B-65280EN/05 FANUC BUILT-IN SPINDLE MOTOR Bis series 1.START-UP
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1.4.4 Related Parameters
CAUTION
This subsection describes the parameters related
to the sub module SM (SSM). If the SSM is not
used (or the SSM cannot be used), the maximum
motor speed (parameter No. 4020) needs to be
limited.
15i 16i 30i
#7 #6 #5 #4 #3 #2 #1 #0
3008 4008 4008
SSMUSE
SSMUSE This parameter sets whether to use the sub module SM (SSM).
0 : Does not use the sub module SM.
1 : Uses the sub module SM. (Set this bit to 1.)
If the SSM is not used, set this bit to 0. In this case, the maximum
motor speed (parameter No. 4020) needs to be limited.
15i 16i 30i
3020 4020 4020
Maximum motor speed
Unit of data : 1min
-1
Valid data range : 0 to 32767
Standard setting value : Depends on the motor model.
This parameter sets a maximum spindle motor speed.
If the SSM is not used, the maximum motor speed needs to be limited
so that the counter electromotive voltage at a speed where the
excessive speed alarm (SPM alarm 07) is detected is lower than the
allowable voltage level of the SPM.
The standard setting (maximum value) of an excessive speed alarm
detection level is 115%, so that the maximum motor speed must
satisfy the following expression:
(Maximum motor speed)×1.15×Ke/1000 ≤ (Allowable voltage level)
Allowable voltage level :
636V
rms
(SPM for 400 V system)
318V
rms
(SPM for 200 V system)
Counter electromotive voltage coefficient :
Ke [V
rms
/1000min
-1
] (between lines)
Example)
When a synchronous built-in spindle motor with the counter
electromotive voltage Ke = 180 [V
rms
/1000 min
-1
] (between lines)
is driven by an SPM of 400 V system, the following maximum
value can be set as the maximum motor speed (parameter No.
4020):
(Maximum value of No. 4020) = 636 / 180 × 1000 / 1.15
= 3072 [min
-1
]