Download - Haas Automation, Inc.

Interfacing to Other Equipment
The Haas control has two signals, input and output. The mill tells the rotary control
to index (an input), it indexes, and sends a signal back, to the mill, that the index
(an output) has been completed. This interface requires four wires; two for each
signal, and are from the rotary control remote input and from the mill.
The control can be installed to communicate with your mill two different ways:
RS-232 Interface or CNC Interface Cable. These connections are detailed in the
following sections.
The Relay In the Haas Control
The relay inside the control has a maximum rating of 2 amps (1 amp for HA5C) at
30 volts DC. It is programmed as either a normally closed (closed during cycle) or
a normally open relay (after cycle). See “Parameters” section. It is intended to drive
other logic or small relays, it will not drive other motors, magnetic starters, or loads
exceeding 100 watts. If the feedback relay is used to drive another DC relay (or
any inductive load), install a snubber diode across the relay’s coil in the opposite
direction of coil current flow. Failure to use this diode or other arc suppression
circuitry on inductive loads, damages contacts of the relay.
Use an ohmmeter to measure resistance across pins 1 and 2, to test the relay. The
reading should be infinite, with the control off. If a lower resistance is measured,
contact points have failed and relay must be replaced.
The Remote Input
The CNC Interface Cable provides communication between the mill and Haas
rotary control. Since most CNC machine tools are equipped with spare M-codes,
semi-fourth axis machining is achieved by connecting one end of the CNC Interface
Cable to any of these spare relays (switches), and the other to the Haas rotary
control. Commands for the rotary unit are stored in rotary control memory, and
each pulse of the mill relay, triggers the rotary control to move the unit to its next
programmed position. Once the move is complete, the rotary control signals that it
has finished and is ready for the next pulse.
A remote socket is provided on the control unit back panel. Remote input consists
of a cycle start signal and a cycle finish signal. To connect to the remote, a connector
(contact your dealer) can be used to trigger the controller from any one of
several sources. The cable connector used is a male four-pin DIN connector. The
Haas Automation part number is 74-1510 (Amphenol part number is 703-91-T-
3300-1). The Haas Automation part number is 74-1509 for the panel receptacle in
the control box (Amphenol part number 703-91-T-3303-9).
Cycle Start
When pins 3 and 4 are connected to each other for a minimum of 0.1 seconds, the
control will move the unit one cycle or step. To move again, pins 3 and 4 must open
for a minimum of 0.1 seconds. Under no circumstances apply power to pins 3 and
4; a relay closure is the safest way to interface the control.
96-0315 Rev P
April 2012
9
Original Instructions