
5. INSTALLATION
B–65162E/03
88
(2) 400–V power supply
S Nominal rated voltage : 400/460 VAC
Neutral grounding is required.
R
S
T
G
Main circuit input power supply
400/460 VAC
Y–connection (neutral grounding)
S Allowable voltage change width : –15% to +10%
(including voltage change
due to the load)
S Power supply frequency : 50/60 Hz
S Allowable change width : "1 Hz
S Power supply unbalance : "5% of the rated voltage or less
S Power supply impedance : Voltage change due to the load
(at maximum output) is 7%
or less.
AC
power supply
[Method to check power impedance]
where,
E
0
: Voltage at motor stop
E
1
: Voltage during motor acceleration or voltage immediately before the
start of speed reduction with the application of load
R L+
S L–
T
G
Motor
E
0
–E
1
E
0
100(%)<7(%)
L+ U
L– V
W
G
AC
voltmeter
Power supply
module
Spindle amplifier
module or servo
amplifier module
D Turn on the control power supply (CX1A power supply input) of a
power supply module (PSM–HV or PSMV–HV) at the same time or
earlier than the CNC.
D The motor rated output is guaranteed for the rated input voltage. If the
input voltage changes, the rated output may not appear even when the
input voltage change is within the allowable range.
D It is recommended that a capacitor unit for power–factor improvement
not be installed. This is because the capacitor unit for power–factor
improvement may adversely affect power regeneration.