
4. CONFIRMATION OF
THE OPERATION START-UP PROCEDURE B-65165E/02
- 58 -
4.3.4 Checking The Feedback Signal Waveform
First, refer to Subsection 9.2.3 of "FANUC SERVO AMPLIFIER α
series Descriptions" (B-65162E), and make sure that the spindle
sensors and other detectors are connected at the correct points. Next,
see the table given below to find the corresponding check terminal
names on the check board from the sensor connector connection points.
Do not observe feedback signals before the parameters for the detectors
that are set. Phase A, B, and Z signals may not be output correctly until
the parameters are loaded from the CNC.
Signals input to the SPM and corresponding check terminals on the
check board
(1) SPM type 1, type 2, and type 4
SPM input
connector
Connector pin
signal
Check
terminal name
Main sensors Remarks
Phase A: pin 5, 6
Phase B: pin 7, 8
PA1
PB1
M, MZ, and BZ sensors
Low resolution side of the high-resolution
magnetic pulse coder (128 to 384 λ)
Phase A: pin 3, 4
Phase B: pin 17, 19
PA4
PB4
High resolution side of the high-resolution
magnetic pulse coder (1000 to 3000 λ)
For type 2 only
JY2
Phase Z: pin 1, 2 PS1 MZ and BZ sensors (one-rotation signal)
pin 18 EXTSC1 Proximity switch (external one-rotation signal)
pin 1, 3 LSA1 Magnetic sensor (LSA signal)
JY3
pin 5, 14 MSA1 Magnetic sensor (MSA signal) *1
Phase A: pin 5, 6
Phase B: pin 7, 8
PAD
PBD
α position coder (1024 p)
Low resolution side of the high-resolution
position coder (1024 p)
Parameter setting
Phase A: pin 3, 4
Phase B: pin 17, 19
PA3
PB3
High resolution side of the high-resolution
position coder (3000 λ)
For type 2 only
JY4
Phase Z: pin 1, 2 PSD α position coder (one-rotation signal)
High-resolution position coder (one-rotation
signal)
Parameter setting
Phase A: pin 5, 6
Phase B: pin 7, 8
PA2
PB2
M, MZ, and BZ sensors
Low resolution side of a high-resolution
magnetic pulse coder (128 to 384 λ)
α position coder S (1024 λ)
For types 2 and 4
only
Phase A: pin 3, 4
Phase B: pin 17, 19
PA3
PB3
High resolution side of a high-resolution
magnetic pulse coder (1000 to 3000 λ)
For type 2 only
Phase Z: pin 1, 2 PS2 MZ and BZ sensors (one-rotation signal) For type 4 only
JY5
Phase Z: pin 1, 2 PSD α position coder S (one-rotation signal)
High-resolution magnetic pulse coder (one-
rotation signal)
Parameter setting
*1 This check terminal is provided for A20B-1005-0740 only. With
A20B-2001-0830, MSA is observed on CH1 or CH2.
Only for SMPs of which the specification is A06B-6078-H315 to 330
JY6 Phase A: pin 5, 6
Phase B: pin 7, 8
PA2
PB2
M, MZ, and BZ sensors For type 2 only