PMAC Product Guide MACHINE CONNECTIONS Typically, the user connections are made to the ACC-8P terminal block that is attached to the JMACH connector by a flat cable. The pinout numbers on the terminal block are the same as those on the JMACH connector for PMAC-Lite. 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 if PMAC is installed in its internal bus. With the board plugged into the bus, it will pull +5V power from the bus automatically and it cannot be disconnected.
In this case, there must be no external +5V supply, or the two supplies will fight each other, possibly causing damage. This voltage can 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 5V supply to power its digital circuits. The +5V line from the supply should be connected to pin 1 or 2 of the terminal block, and the digital ground to pin 3 or 4.
Analog Power Supply 0.3A @ +12 to +15V (4.5W) 0.25A @ -12 to -15V (3.8W) (Eight-channel configuration) The analog output circuitry is the part of PMAC circuitry directly related to the amplifier signals like the DAC command outputs and amplifier fault\enable lines. The analog 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. 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, 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.) Machine Connections 27