Haas+Sohn HRT 160, Руководство оператора и по обслуживанию

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49 96-5047 rev L June 2005
7. HRT TROUBLESHOOTING
7.1 T
ROUBLESHOOTING A
W
ORKING
I
NTERFACE
O
N
A CNC
If you are having problems with an interface, try to isolate the problem by checking the HAAS control and your
CNC separately. There are only two signals and each one can be checked separately from the other. If your
unit stops indexing because of an interface problem, here are some simple checks to follow:
1) Check The HAAS Control Remote Input Alone
Disconnect the remote cable from the back of the controller. Set the control to index a single step of 90
degrees (90
o
). Referring to Figure 2, connect a continuity tester or a voltmeter (a digital meter may not be fast
enough to sample the brief pulse) set for low ohms across pins 1 and 2. They are marked on the rear of the
control as FINISH SIGNAL. Since this is a female plug, you may have to insert some small wires in the plug in
order to make a connection but, in any case, it is imperative that a good connection is made. It must show
open circuit, otherwise check relay Parameters #1 (should be 1) and #2 (should be 0). (With the control turned
off, the relay must show open circuit, otherwise it is defective.) Now, using a wire jumper, short pins 3 and 4
together (They are marked on the rear of the control as CYCLE START.). The unit must index, and at the end of
the index, the voltmeter should deflect briefly towards low ohms or continuity. If this works as described, then
you know the problem is not in the HAAS control, but possibly in the interface cable or your CNC.
2) Check CNC Cable Interface Alone
You can check the signals from the CNC using a voltmeter, keeping in mind that the pin orientation is reversed.
Execute an M function from your CNC to index. The CNC cycle start light should come on and stay on. Use
the meter and check continuity across the cycle start pins (pins 3 and 4). Try not to short your test leads and
pins against the shield of the male plug.
NOTE: On rare occasions, some machine builders provide a +12 to +24 volt signal
on pin 4 to activate our unit. If the continuity test fails, check and see if there
is a voltage present between pin 4 and the machine ground. This is also a valid
cycle start signal. If there is a voltage present on pin 4 when checked with a
voltmeter; a Haas Interface Box must be used (P/N IB). Contact the Haas
Service department if there are questions on how to use the interface box.
To check out the cycle finish, take one of your voltmeter test probes and short together pins 1 and 2 on your
CNC cable. The cycle start light on your CNC should immediately turn off.
If the above tests (1 and 2) pass, you have valid signals coming from your CNC.
3) Check The HAAS Control And CNC Together
Reset your CNC by hitting the RESET button or turning it off. With both the CNC and HAAS controls ON,
connect the remote cable. Nothing should happen. If the HAAS should index, then the cycle start signal from
the CNC is shorted on. If OK, execute or MDI an M function from your CNC to index. Don’t index from the
program unless you are single-blocking it. If the HAAS unit does not index, then your CNC is not outputting a
signal or there is a break in the line.
If the HAAS unit indexes properly, observe that the machine’s cycle start light goes out at the end of index.
(Make sure that this light isn’t burned out.). If the light does not go out then the cycle finish signal is not getting
back to your CNC. This could be an open wire in the remote cable or a problem in the wires that connect to the
CNC.
If the unit works only in single block, but not in the RUN mode, then you’re probably having a timing problem
involving two M functions or are doing simultaneous milling. Please review the section on simultaneous milling.
If you have two M functions, separate them with a dwell of ¼ second.