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3 DESIGN
(7) Example of average power consumption calculation
(a) System configuration
QJ71
LP21-25
Q170M
CPU
Q55B
MR-HDP01
MR-HDP01
QX40 QY40P Q62DAQ173D
PX
Incremental synchronous encoder
(b) 5VDC/24VDC current consumption of each module
Model name 5VDC 24VDC
Q170MCPU 2.00 [A]
0.08 [A]
(Internal output circuit)
Incremental synchronous
encoder
0.20 [A] —
QX40
(Note)
0.05 [A] —
Q173DPX 0.38 [A] —
MR-HDP01 0.06 [A] —
QY40P
(Note)
0.065 [A] 1.60 [A]
QJ71LP21-25
(Note)
0.55 [A] —
Q62DA
(Note)
0.33 [A] 0.12 [A]
Q55B
(Note)
0.10 [A] —
(Note) : 5VDC internal current consumption of shared equipments with PLC might be
changed. Be sure to refer to the MELSEC-Q series PLC Manuals.
(c) Total power consumption for logic 5VDC circuits of all modules
W
5V = (2.00 + 0.20 + 0.05 + 0.38 + 0.06 2 + 0.065 + 0.55 + 0.33 + 0.10) 5
= 18.975 [W]
(d) Power consumption of internal power supply
W
PW =
1
4
18.975 = 4.744 [W]
(e) A total of 24VDC average power consumption of the internal output circuit
and output module
W
24V = (0.08 + 1.60) 24 1 = 40.32 [W]
(f) Average power consumption due to voltage drop in the output section of the
internal output circuit and output module
W
OUT = 0.04 2.75 2 1 + 0.1 0.2 16 1 = 0.54 [W]