Mitsubishi Electric MR-J4W2, Instruction Manual

Page: 58 / 542

3. SIGNALS AND WIRING
3 - 21
3.6.2 Base circuit shut-off delay time function
The base circuit shut-off delay time function is used to prevent vertical axis from dropping at a forced stop
(EM2 goes off), alarm occurrence, or SSCNET III/H communication shut-off due to delay time of the
electromagnetic brake. Set the time from MBR (Electromagnetic brake interlock) off to base circuit shut-off
with [Pr. PC02].
(1) Timing chart
B-axis
or
C-axis C
MBR-A
(Electromagnetic
brake interlock A)
ON
OFF (Enabled)
Base circuit
(Energy supply to
the servo motor)
0 r/min
Servo motor
speed
ON
OFF (Enabled)
EM2 (Forced stop 2)
ON
OFF
ON
OFF (Enabled)
Base circuit
(Energy supply to
the servo motor)
0 r/min
Servo motor
speed
ON
OFF
[Pr. PC02]
[Pr. PC02]
A-axis
MBR-B or MBR-C
When EM2 (Forced stop 2) turns off or
an alarm occurs during driving, the
servo motor will decelerate based on
the deceleration time constant. MBR
(Electromagnetic brake interlock) will
turn off, and then after the delay time
set in [Pr. PC16], the servo amplifier
will be base circuit shut-off status.
(2) Adjustment
While the servo motor is stopped, turn off EM2 (Forced stop 2), adjust the base circuit shut-off delay
time in [Pr. PC16], and set the value to approximately 1.5 times of the smallest delay time in which the
servo motor shaft does not freefall.