Retraction Function At Power Failure; Wiring Of Retraction Function At Power Failure - Mitsubishi Electric MDS-E Series Instruction Manual

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

9.2 Retraction function at power failure

The retraction function at power failure is a function to backup the power of the main circuit from the capacitor unit when
a power failure occurs. For example, when power failure occurs during hobbing, tool escape by retraction operation can
be realized using an NC command (hob retraction).
CAUTION
1. The power backup unit (MDS-D/DH-PFU) and capacitor unit (MDS-D/DH-CU) options are required when using the
retraction function at power failure. Whether the regenerative resistor unit (R-UNIT6,7) is required or not is decided
depending on the spindle stop operation (Deceleration and stop or Coast to a stop) at power failure.
2. Refer to the specifications manual of NC system for details on the NC settings relevant to the hob retraction function.

9.2.1 Wiring of Retraction Function at Power Failure

: Main circuit
: Control circuit
AC
Circuit Contactor
reactor
protector
R
S
T
MC
Ground
Circuit
protector
(Note 1) When using the retraction function at power failure, uninterruptible power supply (UPS) is required for NC
power.
(Note 2) Connect the capacitor unit's TE1(C+,C-) to PFU's TE4(C+,C-).
(Do not connect them to PFU's TE2(L+,L-) or TE5(R1,R2).)
(Note 3) Do not reverse the polarity of C+ and C- when connecting the capacitor unit.
(Note 4) Securely perform the switch setting and control signal connection.
(Note 5) DO2 (tool escape request) of CN43 is used for the retraction function at power failure. Input the DO2
signal to DI of the NC so that DO2 can turn ON the retraction request signal (YCDE) through the PLC
sequence.
(Note 6) In the system with multiple power supply units, each power supply unit must be connected with one
power backup unit.
(Note 7) Connect the control power supply (L11,L21) of the unit where the retraction function at power failure is
not used to a commercial AC power supply.
CAUTION
Connect the PFU's TE3 (OUT-L11, OUT-L21) to L11 and L21 of each unit.
Do not connect them to a commercial AC power supply. The unit will be damaged if connecting the PFU's TE3 to a
commercial AC power supply.
IB-1501229-F
MDS-E/EH-SP
MDS-E/EH-CV
CN4 CN4
CN41
L1
TE1
L2
L3
TE2
L+
L+
TE2
MC1
L - L-
CN23
MC2
TE3
L11
TE3 L11
L21 L21
Ground Ground
450
NC (Note 6)
MDS-D/DH-PFU
MDS-E/EH-Vx
5B
CN43 10A
10B
CN41
R1
TE5
R2
C+
TE2
L+ L+
TE4
TE2
C-
L- L-
The
regenerative
resistor unit is
TE3
required to
TE3
L11 OUT- L11
decelerate and
L21 OUT- L21 stop the
spindle at
L1 power failure.
L2 TE1
L3
Ground Ground
R-UNIT MDS-D/DH-CU
AL1
AL2
R1
R2
C+
TE1
C-