Voltage Drops Across The Qa1S6Adp-S1 And Extension Cables - Mitsubishi Electric QA1S6ADP-S1-U-E User Manual

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.
Main base unit
Power
supply
module
R1
Extension base unit (A1S6 B)
V1
IA
I2+IA×3
Power
supply
module
R2
Extension base unit (A1S5 B)
V2
IA
I2+IA×2
I2
R3
Extension base unit (A1S6 B)
V3
IA
IA
Power
supply
module
Item Extension cable
QC05B
Resistance value 0.044
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
1st level
I1
2nd level
3rd level
I3
QC06B QC12B
0.051 0.082
QC30B QC50B
0.172 0.273
Adapter
QC100B QA1S6ADP-S1
0.530 0.0158
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