Danaher Motion Standalone MMC, Hardware Manual

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Standalone MMC Hardware Manual 37
Danaher Motion
version 15.1
Standalone MMC Control
4.3.2.2 SERCOS board
The SERCOS Motion Control board provides a fiber optic input and output for one
SERCOS ring (MMC-S8) or two SERCOS rings (MMC-S16). There is also a serial
port for field upgrade of the board’s FLASH memory.
4.4 Power Supply Requirements
An MMC system consists of a main module (Analog Servo or SERCOS based) and up
to four option modules. An external 24 Vdc supply is required to power the MMC’s
internal circuitry and external I/O. The 24 Vdc is distributed internally to three different
buses or sections. When you size your power supply, you must ensure that the supply
is large enough to handle the total load and that the maximum current capability of
each bus is not exceeded.
Table 4-2 below shows the distribution of the 24 Vdc power
within the MMC system:
In most cases, one power supply can be used for the entire control system. However,
depending upon the modules, drives, and external I/O used in your application, you
may split the power distribution into two or more power supplies. For example, the
Axis I/O on an MMC A2 module can be powered from the MMC, from the drive, or
from another external power supply.
Refer to Table 4-3 to size the power supply required by your application. Refer to
Table 4-4 to calculate the maximum current required for a theoretical 4 axes MMC.
Table 4-1: Available Analog Servo Board I/O
Available I/O 2 1/2 Axis 4 1/2 Axis
Analog Inputs
1 1
Analog Outputs
2 4
Encoder Inputs
3 5
Axis DC Inputs
2 4
Axis DC Outputs
4 8
Axis Fast DC Inputs
3 5
AUX I/O Port DC Inputs
6 12
Table 4-2: MMC 24 Vdc Power Distribution
Power Bus Supplying Current To: Maximum Current
1 Module Circuitry 3 A
2 General I/O 5 A
3 Module I/O 1 A