Delta Tau Universal PMAC Lite, Hardware Reference Manual

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Universal PMAC Lite
Machine Connections 33
MACHINE CONNECTIONS
Typically, the user connections are actually made to a terminal block that is attached to the JMACH
connector by a flat cable (Acc-8D or 8P). The pinout numbers on the terminal block are the same as
those on the JMACH connector. The possible choices for breakout boards are the following:
Board Mounting Breakout Style
Breakout
Connector
Notes
ACC-8P DIN – Rail Monolithic Terminal Block Simple Phoenix contact board
ACC-8D DIN – Rail Monolithic Terminal Block
Headers for connection to option
boards
ACC-8DCE DIN – Rail Modular D-sub connector
Fully shielded for easy CE mark
compliance
ACC-8DP Panel Modular D-sub connector Used in the PC-pack product
Power Supplies
Digital Power Supply
1.75 A @ +5V (+/-5%) (8.75 W)
(Four-channel configuration, with a typical load of encoders)
•
The host computer provides the 5V power supply in the case PMAC is installed in its internal bus.
•
With the board plugged into the bus, it will automatically pull +5V power from the bus and it cannot
be disconnected. In this case, there must be no ex5V supply, or the two supplies will fight
each other, possibly causing damage. This voltage could be measured between pins 1 and 3 of the
terminal block.
•
In a stand-alone configuration, when PMAC is not plugged in a computer bus, it will need an external
five-volt supply to power its digital circuits. The +5V line from the supply should be connected to
pin 1 or 2 of the JMACH connector (usually through the terminal block), and the digital ground to pin
3 or 4. Acc-1x provides different options for the 5V power supply.
Analog Power Supply
0.3A @ +12 to +15V (4.5W)
0.25A @ -12 to -15V (3.8W)
(Eight-channel configuration)
The analog output circuitry on PMAC is optically isolated from the digital computation circuitry, and so
requires a separate power supply. This is brought in on the JMACH connector. The positive supply --
+12 to +15V -- should be brought in on the A+15V line on pin 59. The negative supply -- -12 to -15V --
should be brought in on the A-15V line on pin 60. The analog common should be brought in on the
AGND line on pin 58.
Typically, this supply can come from the servo amplifier; many commercial amplifiers provide such a
supply. If this is not the case, an external supply may be used. Acc-2x provides different options for the
± 15V power supply. Even with an external supply, the AGND line should be tied to the amplifier
common. It is possible to get the power for the analog circuits from the bus, but doing so defeats optical
isolation. In this case, no new connections need to be made. However, you should be sure jumpers E85,
E87, E88, E89, and E90 are set up for this circumstance. (The card is not shipped from the factory in this
configuration.)