PMAC Quick Reference Guide Resetting PMAC for First Time Use Once communications have been established, type the following commands in the terminal window: $$$*** ;Global Reset P0..1023=0 ;Reset P-variables values Q0..1023=0 ;Reset Q-variables values M0..1023->* M0..1023=0 ;Reset M-variables definitions and values UNDEFINE ALL ;Undefine Coordinate Systems SAVE ;Save this initial, “clean”configuration Connections Typically, the user connections are 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 for PMAC PC.
While the numbering scheme for the pins on machine connectors on PMAC VME is different from that for PMAC PC, the physical arrangement is the same, and PMAC VME users can use the same terminal numbers on the terminal block board in following the instructions given below. Note: Make sure PMAC is not powered while the connections are being made. Leave any loads disconnected from the motor at this point. Power Supplies Digital Power Supply 1.5A @ +5V (+/-5%) (7.5W) (Eight-channel configuration, with a typical load of encoders) The host computer provides the 5V power supply if the 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 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 5V 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.
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 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, 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.) Installing and Configuring PMAC 23