Mitsubishi Electric A173UHCPU User Manual page 83

2. DESIGN
M1608+20n
M1815+20n
M0
T200
Yn
M2408+20n
M3215+20n
M0
T200
Yn
POINT
*1 : T200 is a 10ms timer and has an error produced by the scan time of a sequence program, and that
error is -2/+1 scan.
Actually open the electromagnetic brake and adjust the setting to avoid a servo side error.
For details of the electromagnetic brake circuit and amplifier periphery, refer to the manual of the
servo amplifier used.
For vertical lift applications, make up a system which makes a stop using the mechanical locking
mechanism which will operate at power-off, emergency stop and alarm occurrence, in addition to
the electromagnetic brake, to prevent a drop.
When you want to make a sudden stop at an emergency stop, use the dynamic brake. If it is
used with the electromagnetic brake, the coasting distance will not be so short as expected.
When considering double safety, calculate the coasting distance when the dynamic brake fails,
and examine whether safety is ensured or not. Refer to Appendix 2 and 3 for the brake
characteristics.
• For A172SHCPUN/A171SHCPUN
M1608+20n
M0
M1815+20n
K20
M1608+20n M1815+20n
T200
M0 T200
Yn
:
Servo error detection
:
Servo OFF command
:
Servo error or servo ready OFF detection flag
: Servo side normal period (200ms) measuring timer
Electromagnetic brake operation instruction
:
• For A173UHCPU
M2408+20n
M0
M3215+20n
K20
M2408+20n M3215+20n
T200
M0
T200
Yn
:
Servo error detection
:
Servo OFF command
:
Servo error or servo ready OFF detection flag
:
Servo side normal period (200ms) measuring timer
:
Electromagnetic brake operation instruction
Turns on M0 when servo error detection
(M1608+20n) turns on or servo OFF
command (M1815+20n) turns off.
*1
Servo error Turns on T200 200ms
:
after servo error turns off
Servo ready
:
and servo ready turns on.
Turns on Yn when M0 turns off and
T200 turns on.
Turns on M0 when servo error detection
(M2408+20n) turns on or servo OFF
command (M3215+20n) turns off.
*1
Servo error Turns on T200 200ms
:
after servo error turns off
Servo ready
:
and servo ready turns on.
Turns on Yn when M0 turns off and
T200 turns on.
CAUTION
2 − 14