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DESCRIPTIONDESIG.DATE
Power Failure Backup Module
Descriptions
A-53866E-464
1. OVERVIEW
The power failure backup module is designed to prevent the machine from damage when a power
failure occurs, by controlling the power necessary for motor control from a power failure until the
machine enters a safe state. This module consists of the following modules.
Module name Description
Power failure backup module Detects a power failure, controls the charge and discharge of sub
module C, performs resistance regeneration control in the event of a
power failure, and supplies control power to the amplifier and the
CNC.
Sub module C Contains a capacitor used to store the energy for driving the motor in
the event of a power failure.
Sub module R Contains the regenerative resistor for consuming the energy
generated when the motor decelerates in the event of a power
failure.
Supplement capacitor unit Used as the energy supply source for maintaining the control power
for the amplifier and the CNC in the event of a power failure.
Conforms to the same specifications as those of sub module C.
These modules are used for the machine protection function at power failure, described below.
(1) Retract function at power failure
This function retracts the workpiece and the tool to a position where they do not interfere with
each other while maintaining synchronization if a power failure occurs in synchronous operation.
For this function, the power failure backup module is used in combination with sub module C
and the supplement capacitor unit. The power failure backup module controls the supply of the
energy necessary for driving the servo motor for the retract axis from the capacitor inside sub
module C after a power failure occurs.
(2) Stop distance reduction function at power failure
This function prevents the machine from damage due to overrun if a power failure occurs in
rapid traverse, by decelerating the machine to a stop at the time constant for normal control or
below. It can also decelerate the spindle to a stop in the event of a power failure.