G&L MMC-A2, Hardware Manual

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Standalone MMC Control
G & L Motion Control Inc. MMC Hardware Manual 33
4.4.2.2 SERCOS board
The SERCOS Motion Control board provides a fiber
optic input and output for one SERCOS ring. There is
also a serial port for field upgrades of the board’s
FLASH memory.
4.5 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 4-3 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
Table 4-2: 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 4-3:
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