Mitsubishi MELDAS HS Series Specifications And Instruction Manual page 96

CAUTION
(2) Dynamic brake stop
When an emergency stop occurs, it is possible to have the machine stop from the beginning
using a dynamic brake without controlling the deceleration. Set bit 0 in the servo specifications
(SV017: SPEC) to select a dynamic brake stop.
In a dynamic brake stop, the dynamic brakes operate at the same time the emergency stop
occurs, and the motor brake output also operates at the same time.
Dynamic brakes
Motor brake control output (MBR)
No. Abbrev. Parameter name
SV017 SPEC Servo specifications
POINT
CAUTION
(3) Deceleration control stop distance
If stopping with deceleration control during an emergency stop, the stop distance L
approximately calculated with the following expression. However, the value will be higher than
the following expression if the current is limited during deceleration. Refer to section "3-3-2
Coasting amount" for the stop distance using dynamic brakes.
L =
PGN1 × 60
DEC
F
rapid
PGN1 : Position loop gain 1
EMGt
Chapter 8 Adjustment
If the deceleration control time constant (EMGt) is set longer than the
acceleration/deceleration time constant, the overtravel point (stroke end point)
may be exceeded.
A collision may be caused on the machine end, so be careful.
Motor speed
OFF
ON
OFF
ON
Set the dynamic brake stop with the following parameter.
15 14
bit
0 dmk
If a dynamic brake stop is selected, the software does not participate at all in
the motor stop control after an emergency stop occurs.
When a dynamic brake stop is selected, in general the coasting distance
during an emergency stop will be comparatively longer, so be careful.
F 1 F
×
+
2 60
: Feedrate during emergency stopped
: Rapid traverse rate
: Deceleration control time constant
Emergency stop occurrence
Explanation
13 12 11 10 9 8
Meaning when "0" is set.
Deceleration control stop
F × EMGt
×
(mm)
rapid × 1000
(SV003)
(SV056)
8–25
Time
7 6 5 4 3 2
abs vdir mc
Meaning when "1" is set.
Dynamic brake stop
DEC
(mm/min)
(mm/min)
(rad/sec)
(msec)
1 0
dmk
can be