Delta Tau Turbo PMAC PCI-Lite, Справочник по аппаратуре

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Turbo PMAC PCI Lite
Machine Connections 11
Machine Port Connections (JMACH Connector)
Overtravel Limits and Home Switches
When assigned for the dedicated uses, these signals provide important safety and accuracy functions.
+LIMn and -LIMn are direction-sensitive overtravel limits that must be actively held low (sourcing
current from the pins to ground) to permit motion in their direction. The direction sense of +LIMn and -
LIMn is as follows: +LIMn should be placed at the
negative end of travel, and -LIMn should be placed at
the positive end of travel.
Types of Overtravel Limits
PMAC expects a closed-to-ground connection for the limits to not be considered on fault. This
arrangement provides a failsafe condition and therefore it cannot be reconfigured differently in PMAC.
Usually a passive normally closed switch is used. If a proximity switch is needed instead, use a 15V
normally closed-to-ground NPN sinking type sensor.
Jumper E89, E90 and E100 must be set appropriately for the type of sensor used.
Home Switches
While normally closed-to-ground switches are required for the overtravel limits inputs, the home switches
could be either normally closed or normally open types. The polarity is determined by the home sequence
setup, through the I-variables I902, I907, ... I977. However, for the following reasons, the same type of
switches used for overtravel limits are recommended:
Normally closed switches are proven to have greater electrical noise rejection than normally open types.
Using the same type of switches for every input flag simplifies maintenance stock and replacements.
Incremental Encoder Connection
Each JMACH connector provides two +5V outputs and two logic grounds for powering encoders and
other devices. The +5V outputs are on pins 1 and 2; the grounds are on pins 3 and 4. The encoder signal
pins are grouped by number: all those numbered 1 (CHA1, CHA1/, CHB1, CHC1, etc.) belong to
encoder #1. The encoder number does not have to match the motor number, but usually does
.
If the PMAC is not plugged into a bus and drawing its +5V and GND from the bus, use these pins to
bring in +5V and GND from the power supply. Connect the A and B (quadrature) encoder channels to the
appropriate terminal block pins. For encoder 1, the CHA1 is pin 25, CHB1 is pin 21. If it is a single-
ended signal, leave the complementary signal pins floating. Do not ground them
. However, if single-
ended encoders are used, make sure the resistor packs are in the default position (RP-60/62/66/68). For a
differential encoder, connect the complementary signal lines — CHA1/ is pin 27, and CHB1/ is pin 23.
The third channel (index pulse) is optional. For encoder 1, CHC1 is pin 17, and CHC1/ is pin 19.
JMACH1
+Lim
AGnd
51
58
Dry Contact
51
59
58
+Lim
AGnd
+15V
Output
JMACH
+Lim
51
JMACH1
DC
12-24V
JMACH2, PIN 59
+ -
15 Volts proximity 15-24 Volts proximity