
A. Directives, Standards and Technical Conditions for 3
rd
Party Servo /
Spindle Motors & Encoders when Applying FANUC / GE Fanuc Dual-check Safety APPENDIX
B-64004EN/02
- 158 -
A.4 SERVO
A.4.1 Servo Motors – Driven by FANUC / GE Fanuc Servo Amplifier
• 3-phase AC synchronous motor, compact type
• Input voltage: 200 V AC or 400 V AC
• Number of pole-pairs actually limited to 72
• Applicable maximum speed of servomotors = 60/pole-pairs * f
max
(f
max
= 266 Hz)
• Rated current must be equal or less than rated current of servo
amplifier
• Maximum current must be equal or less than maximum current of
servo amplifier
• Maximum peak current of servo amplifier must be less than
demagnetization current of motor.
• Current at dynamic braking must not exceed the maximum DB
current.
Maximum DB current depends on servo amplifier model (DB
resistor, relay contacts).
• Regenerated energy at dynamic braking must not exceed the DB
resistor capacity.
DB resistor capacity depends on servo amplifier model.
A.4.2 Servo Encoder – Speed / Position Feedback Sensor
Embedded in Motor
A.4.2.1 Encoder with FANUC / GE Fanuc Serial Interface
• Signal type: Special FANUC serial interface (e.g.: αA1000S,
RCN723F, LC191F)
• Number of pulses per revolution: up to 2
24
ppr
A.4.2.2 A/B-Phase Sine-wave Interface Connected to FANUC / GE
Fanuc Interpolation Circuit
• Signal type:
sine-wave 1V (peak-to-peak), e.g. Heidenhain ERM 180
• Number of pulses per revolution:
up to 32768 ppr (32768 * 512 = 2
24
ppr)
• Signal specification: see Attachment 2
• Maximum input frequency: 200 kHz