Instruction manual

3 - 25
3. SIGNALS AND WIRING
(b) Output devices
Control
mode
Device Symbol
Connec-
tor pin
No.
Functions/Applications
I/O
division
PST
Trouble ALM CN1-48 ALM turns off when power is switched off or the protective circuit is
activated to shut off the base circuit.
Without alarm occurring, ALM turns on within 1.5s after power-on.
DO-1
Ready RD CN1-49 RD turns on when the servo is switched on and the servo amplifier is
ready to operate.
DO-1
In position INP INP turns on when the number of droop pulses is in the preset in-
position range. The in-position range can be changed using
parameter No. PA10.
When the in-position range is increased, INP-SG may be kept
connected during low-speed rotation.
INP turns on when servo on turns on.
DO-1
Speed reached SA
CN1-24
SA turns off when servo on (SON) turns off or the servomotor speed
has not reached the preset speed with both forward rotation start
(ST1) and reverse rotation start (ST2) turned off. SA turns on when
the servomotor speed has nearly reached the preset speed. When
the preset speed is 20r/min or less, SA always turns on.
DO-1
Limiting speed VLC VLC turns on when speed reaches the value limited using any of the
internal speed limits 1 to 7 (parameter No. PC05 to PC11) or the
analog speed limit (VLA) in the torque control mode.
VLC turns off when servo on (SON) turns off.
DO-1
Limiting torque TLC
CN1-25
TLC turns on when the torque generated reaches the value set to the
Forward torque limit (parameter No. PA11), Reverse torque limit
(parameter No. PA12) or analog torque limit (TLA).
DO-1
Zero speed ZSP CN1-23 ZSP turns on when the servo motor speed is zero speed (50r/min) or
less. Zero speed can be changed using parameter No. PC17.
Example
Zero speed is 50r/min
Parameter
No. PC17
OFF
ON
Servo motor
speed
20r/min
(Hysteresis width)
ON level
50r/min
OFF level
70r/min
zero speed
(ZSP)
Forward
rotation
direction
Reverse
rotation
direction
0r/min
ON level
50r/min
OFF level
70r/min
20r/min
(Hysteresis width)
Parameter
No. PC17
ZPS turns on
1
when the servo motor is decelerated to 50r/min, and
ZPS turns off
2
when the servo motor is accelerated to 70r/min
again.
ZPS turns on
3
when the servo motor is decelerated again to -
50r/min, and turns off
4
when the servo motor speed has reached -
70r/min.
The range from the point when the servo motor speed has reached
ON level, and ZPS turns on, to the point when it is accelerated again
and has reached OFF level is called hysteresis width.
Hysteresis width is 20r/min for the MR-J3-A servo amplifier.
DO-1