User`s manual

Installing and Configuring PMAC
Page - 25
format requires some parameter changes on PMAC; (see Ix02 and Ix25). Jumper E17 controls the polarity of the direction
output; this may have to be changed during the polarity test. This magnitude-and-direction mode is suited for driving servo
amplifiers that expect this type of input, and for driving voltage-to-frequency (V/F) converters, such as PMAC's ACC-8D
Option 2 board, for running stepper motor drivers.
If you are using PMAC to commutate the motor, you will use two analog output channels for the motor. Each output may
be single-ended or differential, just as for the DC motor. The two channels must be consecutively numbered, with the
lower-numbered channel having an odd number (e.g. you can use DAC1 and DAC2 for a motor, or DAC3 and DAC4, but
not DAC2 and DAC3, or DAC2 and DAC4). For our motor #1 example, connect DAC1 (pin 43) and DAC2 (pin 45) to the
analog inputs of the amplifier. If using the complements as well, connect DAC1/ (pin 45) and DAC2/ (pin 46) the minus-
command inputs; otherwise leave the complementary signal outputs floating. If you need to limit the range of each signal to
+/- 5V, you will do so with parameter I169.
3.7.5 - Amplifier enable signal (AENAx/DIRn)
Most amplifiers have an enable/disable input that permits complete shutdown of the amplifier regardless of the voltage of
the command signal. PMAC's AENA line is meant for this purpose. If you are not using a direction and magnitude
amplifier or voltage-to-frequency converter, you can use this pin to enable and disable your amplifier (wired to the enable
line). AENA1/DIR1 is pin 47. This signal is an open-collector output and requires a pull up resistor to A+15V. For early
tests, you may wish to have this amplifier signal under manual control. The polarity of the signal is controlled by jumper (s)
E17. The default is low-true (conducting) enable. For any other kind of amplifier enable signal, a dry contact of a relay or a
solid-state relay could be used:
The amplifier enable signal could also be manually controlled setting Ix00=0 and using the properly defined Mx14 variable.
3.7.6 - Amplifier fault signal (FAULTn)
This input can take a signal from the amplifier so PMAC knows when the amplifier is having problems, and can shut down
action. The polarity is programmable with I-variable Ix25 (I125 for motor #1) and the return signal is analog ground
(AGND). FAULT1 is pin 49. With the default setup, this signal must actively be pulled low for a fault condition. In this
setup, if nothing is wired into this input, PMAC will consider the motor not to be in a fault condition.
The amplifier fault signal could be monitored using the properly defined Mx23 variable.
3.7.7 - General-Purpose Digital Inputs and Outputs (JOPTO Port)
PMAC's JOPTO connector (J5 on PMAC-PC, -Lite, and -VME) provides eight general-purpose digital inputs and eight
general-purpose digital outputs. Each input and each output has its own corresponding ground pin in the opposite row. The
34-pin connector was designed for easy interface to OPTO-22 or equivalent optically isolated I/O modules. Delta Tau's
Accessory 21F is a six-foot cable for this purpose. These inputs and outputs are typically accessed in software through the
use of M-variables. In the suggested set of M-variable definitions, variables M1 through M8 are used to access outputs 1
through 8, respectively, and M11 through M18 to access inputs 1 through 8, respectively. This port maps into PMAC's
memory space at Y address $FFC2.
The ACC-21S is an I/O simulator for the PMAC JOPTO port; it provides 8 switch inputs and 8 LED outputs.
The ACC-21S is a good tool for I/O simulation and troubleshooting of the JOPTO port in PMAC.
AENA147
JMACH1
To the amplifier
enable signal
+15 V59
+15 V
59
47
JMACH1
To the amplifie
r
enable signal
AENA1