Filter
Top Products
9 - 6
9 Power Backup System
MITSUBISHI CNC
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).
9.2.1 Wiring of Retraction Function at Power Failure
(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
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.
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.
MC2
T
S
R
CN4
L1
L2
L3
L11
TE3
TE1
L+
L-
TE3
TE2
L+
L-
L11
L21
TE2
L21
TE3
TE2
L+
L-
L11
L21
MC
CN4
MC1
CN23
TE3
TE2
L+
L-
OUT-L11
OUT-L21
TE1
L1
L2
L3
CN41
CN41
MDS-D2/DH2-CV
MDS-D2/DH2-SP
MDS-D2/DH2-Vx
MDS-D/DH-PFU
R-UNIT
R1
R2
R1
R2
TE5
AL1
AL2
CN43
10A
10B
MDS-D/DH-CU
C+
C-
R1
R2
TE4
TE1
5B
NC (Note 6)
The
regenerative
resistor unit is
required to
decelerate and
stop the
spindle at
power failure.
ۑ
: Control circuit
۔
: Main circuit
Contactor
Circuit
protector
Circuit
protector
AC
reactor
Ground Ground Ground Ground
Ground