Instruction manual

5 - 6
5. OPERATION AND FUNCTIONS
For the following cases, the magnetic pole detection is required.
(a) When using the incremental linear encoder (Refer to (1) of this section)
(b) When using the absolute position linear encoder and matching with the cases indicated below (Refer to
(2) of this section)
At the system setup (at the first startup of equipment)
When the servo amplifier is replaced
When the linear servo motor (primary side (coil) or secondary side (magnet)) is replaced
When the linear encoder (scale or head) is replaced or its installation is changed
(1) For the incremental linear encoder
For the incremental linear encoder, the magnetic pole detection is required every time the power is turned
on. By turning ON the servo-on command from the controller after the power-on, the magnetic pole
detection is automatically carried out. Therefore, there is no need to set the parameters for executing the
magnetic pole detection.
(a) Timing chart
ON
OF
ON
OF
ON
OF
95ms
Servo-on command
Base circuit
Ready (RD)
15s or less
Magnetic pole detection time (Note)
Note. The magnetic pole detection time indicates the operation time when the stroke limits (FLS and RLS) is ON.
(b) Linear servo motor operation (when FLS and RLS are ON)
Servo-on position
(Magnetic pole detection start position)
RLS
(Note 2)
FLS
(Note 1)
(Note 2)
Magnetic pole detection complete position
Note 1. When the stroke limit (FLS or RLS) turns OFF during the magnetic pole detection, the operation of magnetic pole detection is
carried on to the opposite direction. When both FLS and RLS are OFF, the magnetic pole detection error (27) occurs.
2. The following shows the pitch against magnetic pole.
Linear servo motor series LM-H2 LM-U2
Pitch against magnetic pole
[mm]
48 60