Mitsubishi Electric 13JZ96, User Manual

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23
6.2
Voltage Drops Across the QA1S6ADP-S1 and Extension Cables
Voltage (5VDC) is supplied to the QA1S6ADP-S1 from the power supply module on the main
base unit. Voltage drops occur across the QA1S6ADP-S1 and extension cables due to their
resistance. If the specified voltage (4.75VDC or higher) is not supplied to the QA1S6ADP-
S1+A1S5
 B/A1S6  B, incorrect input or output may be generated.
Since the output voltage of the power supply module on the main base unit is set to 4.90VDC
(minimum), check that the sum of the voltage drops (between the main base unit and the
extension base unit ('n'th level)) is 0.15V (4.9V-4.75V=0.15V) or lower.
Calculation example
The voltage drop calculation example is shown below.
Item Extension cable Adapter
QC05B QC06B QC12B QC30B QC50B QC100B QA1S6ADP-S1
Resistance value 0.044  0.051  0.082  0.172  0.273  0.530  0.0158 
Symbol Description
VnS Sum of the voltage drops (between the main base unit and the extension base unit ('n'th level))
V1 Voltage drop across the extension cable between the main base unit and the extension base unit
(1st level)
Vn Voltage drop across the extension cable between the extension base unit ('n-1'th level) and the
extension base unit ('n'th level)
R1 Resistance value of the extension cable between the main base unit and the extension base unit (1st
level)
Rn Resistance value of the extension cable between the extension base unit ('n-1'th level) and the
extension base unit ('n'th level)
RA Resistance value of the QA1S6ADP-S1
I1 to I3 Current consumption of the modules mounted on the extension base units (1st to 3rd level).
(In the system where the A1S6
 B is used, the current consumption of the module(s) mounted on
the extension base unit is supplied from the power supply module on the extension base unit.)
IA Current consumption of the QA1S6ADP-S1
I2
IA
IA
IA
R1
V1
R2
V2
R3
V3
I1
I3
I2+IA×3
I2+IA×2
IA
Main base unit
Extension base unit (A1S6 B)
1st level
Extension base unit (A1S5 B)
2nd level
Extension base unit (A1S6 B)
3rd level
Power
supply
module
Power
supply
module
Power
supply
module