Determining Maximum Number Of Devices Per Pdu3; Calculation Example - adept technology MotionBlox-10 Installation Manual

Determining Maximum Number of Devices per PDU3

The table below (from the
maximum DC power output capability.
Table 3-2. PDU3 Specifications
Amplifier DC Output
Output Voltage
Output Current
AUX DC Output
Output Voltage
Output Current
a
Note: maximum combined amplifier DC output current and Aux/IO Blox
output current may not exceed 4 A.
The table below (from the
input power requirements for each MB-10 amplifier.
Table 3-3. Adept MB-10 Specifications
Input Power Requirements
DC input current
- MB-10 and motor only
- MB-10, motor and brake
- additional per IO Blox

Calculation Example

For the PDU3's 4.0 A maximum DC output, the example below shows how you can
calculate how much each axis is drawing and how much would be left over on the User
line.
For a four-axis system comprised of two standard Python modules (one with brake), two
Servo Kits, a third-party "user" brake that draws 0.37 amps, and two I/O Blox devices:
Table 3-4. Calculation Example
Axis 1 Python with one I/O Blox
Axis 2 Python with brake
Axis 3 Servo Kit & user brake
Axis 4 Servo Kit & I/O Blox
Total demand on PDU3 amplifier DC output line
Adept MotionBlox-10 Servo Kit Installation Guide, Rev. B
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Adept Python Linear Modules User's
24 VDC +/- 10%
a
3 A maximum
24 VDC +10% -15%
a
3 A maximum
Adept Python Linear Modules User's
1 A max.
400 mA, nominal at 24 V
675 mA, nominal at 24 V
25 mA, nominal at 24 V
400 mA + 25 mA
675 mA
400 mA + 370 mA
400 mA + 25 mA
System Specifications
Guide) shows the PDU3
Guide) shows the DC
= 425 mA
= 675 mA
= 770 mA
= 425 mA
= 2.295 A
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