Mardus-Kreutz board Setup, CNC, plytka inna

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Mardus-Kreutz board setup.
(For boards up to
Rev2.1E)
After you finish the assembly of the "Mardus-Kreutz and translator boards, you need
to test them before powering up.
Do not connect the Vmotor leads to the power supply until directed.
First, measure resistance between Vmotor and ground. After a low resistance
measurement (capacitor charge) the resistance value will increase steadily to high
impedance about or over 1 Megohm. Reversing the meter probes will show a
negative resistance (due to the capacitor being charged) and going through zero to a
high value about 1 Megohm or higher.
Measure resistance between GND and J1+ (+12 volt power connector) you should
get similar results.
Connect the ohm-meter probes between the test point +VDD and ground, you
should measure high resistance after a while (due to the charge of the capacitors)
more than 5 Kohms. If it is not over 5 Kohm after 15 seconds, stop the test and
begin troubleshooting.
You should measure high resistance between PC_GND and GND on the board, and
between VCC_PC and +5V test point on the board.
Connect the ohm-meter probeS between the test point +5V and ground, you should
measure high resistance after a while due to the charge of the capacitors) more than
2.5 Kohms.
Connect the ribbon cable
to the translator board and P1 on the Mardus-Kreutz
board.
Observe cable polarity
, the red strip should be near the pins marked 1 and 2
on both boards. The resistance value should drop a bit but still stay over 2.5 kohm.
If any of these values is low resistance or too (more than +/- 10%)
different to the specified, STOP the test immediately, and begin
troubleshooting.
Disconnect the 10 pin ribbon cable from the P1 connector on the Mardus-Kreutz
board.
Put the VOM in DC voltage mode.
Connect the two cables from J1 to the 12 volt DC power supply, make sure the +12
volt cable goes to the screw terminal marked +12V and GND to the terminal marked
GND. Double check if necessary before powering on.
Power on the +12 volt power supply. No noises or heating should occur.
Measure Dc voltage between the test point marked +VDD (more or less in the center
of the board) and ground. You should measure 9 volt.
Leave one of the probes connected to ground and move the other test probe to the
test pint marked +5V, you should measure 5Volts there.
If any of these voltages is not present or different to the specified, STOP the
test immediately, and begin troubleshooting.
Power off the +12 volt power supply and wait about 20 seconds. Feel the
temperature on the tab of the 9 volt regulator (7809) It could not feel hot under any
circumstances!. If it is hot STOP the Test and begin troubleshooting.
Connect the ribbon cable from the translator board to P1 on the Mardus-Kreutz
board. The red strip should be near the pins marked 1 and 2 on both boards. Set all
the S1 switches (or jumpers) to the open position.
Power on the +12 volt power supply. Measure the +5 volts on the test point again. It
still has to be +5 volt. The little RED LED has to blink at a low rate (once per
second).
If this does not happen Stop the test and troubleshoot the translator board and/or
ribbon cable (continuity).
MOTOR CURRENT SETUP
Put your measurement probe on the test point
TP1
(the other measurement probe
should stay connected to ground), adjust potentiometer
R18
CW and CCW, the
voltage should change from about 1 Volt (maximum) to 0 volt. Adjust the voltage to
V (volts) = 0.14 times maximum motor current (Amps).
Put the measurement probe to the test point
TP2
, repeat the same test and adjust
the voltage to the same value as the prior step by using
R19
.
Power off the +12 volt power supply and wait for about 20 seconds.
-----------------------------------------------------------------------------------------------
Continue the Board Setup
Place one of the S1 jumpers/switches (PD3, PD1, PD0) in the "on" position.
Turn on the +12 Volt power supply.
The RED Led should turn on almost immediately, then turn off. After 1 second the
Yellow LED should turn on. Measure voltage at
TP1
and
TP2
. One of them should be
zero Volts, the other one approx. 1/2 the value you adjusted.
If this did not happen troubleshoot the translator board. (Current reduction circuit)
Turn off the +12 Volts power supply. Wait 20 seconds.
Put all the S1 switches/jumpers in the OFF (open position)
Vmotor power supply should be OFF!! Measure 0 Volt between + and - cables.
Connect all the cables to the Vmotor power supply (verify polarity) + connected to
the +Vmotor solder connection, - connected to J3 (GND) solder connection.
Place the 10 Amp Slow blow fuse in the fuse holder.
Turn on the +12 volt power supply.
Turn on the Vmotor power supply.
No smoke, heating or noises should occur. Measure Vmotor voltage between Gnd
and both ends of the fuse.
Turn off Vmotor power supply. Turn OFF +12V por supply. Monitor the voltage
between Vmotor and GNd until it drops to 0 volt, it has to take a long time to drop.
After that voltage gets to 0 volt.
Connect the motor leads in the right screw terminals.
(You should have identified them previously by using the manufacturer's
datasheets).
Turn on the +12 Volt power supply, then Turn on the Vmotor power supply.
The RED LED should still be blinking at 1 blink /second.
No motor movement, noise heat or smoke should be noticeable. Double check all the
voltages on the test points. TP1 and TP2 should be the same voltages you adjusted.
+5 and +9 volt should be present, as well as Vmotor. No current should be flowing
from The Vmotor power supply.
Turn off Vmotor. After Vmotor reached 0 volts, turn off the + 12V power supply.
Connect the cable to the B.O.B. (step, direction) on the translator board connect the
cables to VCC_PC and PC_GND.
(You should measure high resistance between PC_GND and GND on the board, and
between VCC_PC and +5V test point on the board)
Turn on the PC and Check +5Volt between VCC_PC and PC_GND. Start Mach3 or the
program of your choice so the PC parallel port has a definite state on its pins.
Set the S1 (jumpers/switches) for the microstep mode of choice.
Turn "ON " +12V power supply
No smoke or overheating should be noticeable, the motor should be easily moved by
hand the Yellow LED should have lit after a second and stayed lit.
Start sending pulsed by jogging or using Gcode. The yellow LED should turn OFF
immediately and turn on 1 second after the last pulse was sent.
If you have a scope you should see the reference waveforms at Tp1 and Tp2,
otherwise using the DC voltmeter probes connected between GND and Tp1 (or Tp2)
you should see the voltage change while jogging at very low speed.
Stop sending pulses. Turn off the +12 Volt power supply.
Turn on both power supplies at the same time (or +12 volt ON before turning on
Vmotor power supply).
The motor should "freeze" immediately, after a second the Yellow LED should come
on.
Begin jogging at low speed in both directions. This time the motor should move.
Then you can run more speed tests and motor tuning if everything went OK.
Otherwise troubleshoot.
Never turn on Vmotor before turning on the +12 Volt power supply
.
Never turn off the +12 Volt power supply before turning off Vmotor.
Always have the PC on, the Lpt cable (printer cable) connected to the Break
out Board, and Mardus-Kreutz boards connected to the latter before
powering on the boards
, otherwise noise during connection could produce sudden
motor movements.
Never disconnect the motor cables with the power ON!!
Kreutz.
7/29/2007
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