5.4 Settings That Must Be Adjusted to the System
5.4.5 Motor Overload Detection Level
5-28
Linear Coordinates
For a ball screw or other equipment with linear coordinates, set PnB20 to 0, set the forward
software limit (P-LS) in PnB21, and set the reverse software limit (N-LS) in PnB23.
An error will occur if the positioning target point exceeds a software limit.
An error will also occur if ±INFINITE is specified for the target position in the program table.
If the motor reaches a software limit during jog speed table operation, the motor will be
stopped at the deceleration rate set in PnB2B.
If you set both PnB21 and PnB23 to 0, the software limits are disabled.
The software limits are enabled when homing is completed. However, if PnB31 is set to 0
(operate without homing), the software limits are enabled as soon as the power supply is
turned ON.
Rotational Coordinates
For a rotary table or other equipment with rotational coordinates, set PnB20 to 1 (shortest
path), 2 (always forward), or 3 (always reverse). Set the last rotational coordinate in PnB21 and
the first rotational coordinate in PnB23.
The software limits are disabled.
If PnB20 is set to 1 (shortest path) and an absolute position is specified for the positioning
position, either forward or reverse rotation will be used, whichever is shorter.
If PnB20 is set to 2 (always forward) and an absolute position is specified for the positioning
position, forward rotation will always be used.
If PnB20 is set to 3 (always reverse) and an absolute position is specified for the positioning
position, reverse rotation will always be used.
If a relative position is specified, rotation will be in the specified direction regardless of the set-
ting of the parameter.
If a rotary table or other device with rotational coordinates is used, but mutiturn operation is not
possible, use linear coordinates (PnB20 = 0).
In this case, PnB21 and PnB23 are for software limits.
5.4.5
Motor Overload Detection Level
The motor overload detection level is the threshold used to detect overload alarms and over-
load warnings when the Servomotor is subjected to a continuous load that exceeds the Servo-
motor ratings.
It is designed to prevent Servomotor overheating.
You can change the detection timing for A.910 warnings (Overload) and A.720 alarms (Contin-
uous Overload). You cannot change the detection level for A.710 alarms (Instantaneous Over-
load).
Forward software limit
(P-LS): PnB21
Reverse software limit
(N-LS): PnB23
Workpiece
Example
•
PnB21 = +3,599 and PnB23 = 0
•
PnB21 = +4,999 and PnB23 = -5,000
PnB23 = 0
PnB21 = +3599
PnB23 = -5000
PnB21 = +4999
Starting point
Starting point