Deceleration And Stop Function At Power Failure; Specifications Of Stop Method For Deceleration And Stop Function At Power Failure System - Mitsubishi Electric MDS-E Series Instruction Manual

MDS-E/EH Series Instruction Manual
9 Power Backup System

9.1 Deceleration and Stop Function at Power Failure

The deceleration and stop function at power failure is a function to safely decelerate the servo axes and the spindle
when a power failure occurs. This function prevents a damage on the machine due to an overrun of the servo axes, and
at the same time, realizes a protection against overvoltage for high-speed IPM spindle motors and high-speed DDMs.
CAUTION
The power backup unit (MDS-D/DH-PFU) and regenerative resistor unit (R-UNIT6,7) options are required when using the
deceleration and stop function at power failure.
9.1.1 Specifications of Stop Method for Deceleration and Stop Function at Power Failure
System
The power backup system is a system to protect the machine and drive units at a power failure. When it is used, stop
methods during some operations are different from those of when it is not used. See below for the stop methods of
<servo system> and <spindle system> when the power backup system is not used ((1) in the tables) and when it is used
((2) in the tables) depending on what is occurring.
< Servo system >
What is occurring
Power failure
Servo power
backup setting
(1) No power
Dynamic stop
backup system
(2) Deceleration Deceleration
and stop function control + PFU
at power failure regeneration
(Note 1) A deceleration and stop operation is carried out in the case of some MDS-E/EH-CV alarms. (ALM66, 68 to 6E, 70,
75)
< Spindle system >
What is occurring
Power failure
Servo power
backup setting
(1) No power Coast to a
backup system stop
(2)-1 Deceleration
and stop function
Deceleration
at power failure
control + PFU
*When using IM or
regeneration
low-speed IPM
motor
(2)-2 Deceleration
and stop function Deceleration
at power failure control + PFU
*When using high- regeneration
speed IPM motor
(Note 1) A deceleration and stop operation is carried out in the case of some MDS-E/EH-CV alarms. (ALM66, 68 to 6E, 70,
75)
IB-1501229-F
External
NC power MDS-E/EH-
emergency
down
stop
Deceleration Deceleration
control + control +
Dynamic stop
Power Power
regeneration regeneration
Deceleration
control + PFU
Deceleration Deceleration
regeneration
control + control +
Dynamic stop
Power Power
in the case of
regeneration regeneration
some alarms
(Note 1)
External
NC power MDS-E/EH-
emergency
down
stop
Deceleration
Coast to a control + Coast to a
stop Power stop
regeneration
Deceleration
control + PFU
Deceleration Deceleration regeneration
control + control + Coast to a
Power Power stop in the
regeneration regeneration case of some
alarms (Note
1)
Deceleration
control + PFU
Deceleration Deceleration regeneration
control + control + Coast to a
Power Power stop in the
regeneration regeneration case of some
alarms (Note
1)
446
MDS-D/DH- (Another
PFU axis) Drive
CV alarm
alarm unit alarm
Deceleration
control +
-
Power
regeneration
Deceleration Deceleration
control + control +
Power Power
regeneration regeneration
MDS-D/DH- (Another
PFU axis) Drive
CV alarm
alarm unit alarm
Deceleration
control +
-
Power
regeneration
Deceleration Deceleration
control + control +
Power Power
regeneration regeneration
Deceleration Deceleration
control + control +
Power Power
regeneration regeneration
(Its own axis)
(Its own axis)
Drive unit
Drive unit
deceleration
dynamic stop
and stop
alarm
alarm
Deceleration
control +
Dynamic stop
Power
regeneration
Deceleration
control +
Dynamic stop
Power
regeneration
(Its own axis)
(Its own axis)
Drive unit
Drive unit
deceleration
dynamic stop
and stop
alarm
alarm
Deceleration
control + Coast to a
Power stop
regeneration
Deceleration
control + Coast to a
Power stop
regeneration
Overvoltage
protection
control
Deceleration (Coast to a
control + stop from
Power deceleration
regeneration operation only
during high-
speed
rotation)