7
WIRING
All wiring connections are made through an MS connector
located on the back of the unit . Although two connectors are
provided, only the larger, 10-pin connector is used. (See
Figure 1, page 3 of this document.) A two-foot coiled cable
that extends to ten feet is available with plugs for easy
removal, A straight plug is provided on one end, and a right
angle plug on the other. Order Part number KW01015. Use
Part number MS3102A18-1P (K03989) connector on the
control panel for cable connection.
ADJUSTMENT
The Grade Controller will provide extended, trouble-free
operation and should not need servicing under normal
operating conditions. If preliminary investigation of a
system malfunction indicates trouble in the
MCW100C,E the following facts should be kept in mind
to help determine the problem.
1.
The lights will indicate deviations in grade whenever
power is applied to the MCW100C,E, regardless of the
Run/Standby switch position.
2.
In the Run position, amplifier output is connected to the
solenoid. In the Standby position, it is not.
3.
If the deadband potentiometer is turned fully clockwise
(maximum deadband), a large deviation will be needed
to command an output to the solenoid.
4.
Preliminary checks should include examination of the
cables and leads for damaged or broken wire. Examine
areas where shorting may occur. Check the power
supply to be sure it is greater than 11 Vdc (22 Vdc on 24
volt models).
5.
Should a bulb need replacement, unscrew the lens from
the panel. The bulb snaps out of its socket, but because
clearances are tight it may be impossible to remove by
hand. If a piece of 5/16" rubber tubing is available, it can
be pushed down over the bulb and pulled back to effect
removal. The replacements are
'DQIRVV
Part
QXPEHU
K00706 for 12 volt models and K00707 for 24
9ROW
models. The part can also be purchased through
other vendors as a number 161 (12
9
olt) or number 656
(24
9
olt) bulb.
1.
Place the RUN/STANDBY switch on STANDBY.
2.
Turn the deadband potentiometer fully counterclock-
wise to minimum deadband.
3.
Apply electrical power to the system. Hydraulic power is
not necessary at this time.
4.
With the equipment at the correct grade position, adjust
the position of the MCW100C until the UP/DOWN grade
lights are blinking for the same amount of time. Lock the
controller in place.
5.
Move the follower up and down about 1/4" while observ-
ing the lights and increase the deadband setting (turn
clockwise) until both lights are off for about 1/16" of
movement. Usually this is about 1/4 turn clockwise.
6.
Turn ON the hydraulic power and place RUN/STANDBY
switch on RUN.
7.
Introduce a grade error into the system by either using
the machine JOG switch or by pushing down on the
follower.
8.
Observe the response of the machine. If it oscillates
when returning to null, the deadband is too small. Turn
the potentiometer clockwise. If the machine slowly
approaches null but stops short, the deadband is too
large. Turn the potentiometer counterclockwise.
9.
Replace the screw to cover the deadband adjustment.
TROUBLE CHECK
1.
With the RUN/STANDBY switch in the STANDBY posi-
tion, operate the machine JOG switch in both directions
while noting operation of the solenoid. (The JOG switch
is wired separately.) If the solenoid operates in the
wrong direction, reverse the leads on the valve and
recheck. If the solenoid fails to operate, check for voltage
at the JOG switch terminals at the center-off position and
at the solenoid terminals when the switch is activated. If
proper voltage exists, replace the solenoid. If there is no
voltage, check the wiring.
2.
Check the lights when the Grade Controller is in the
STANDBY mode. Use the JOG switch to vary machine
position and note the indication. One light and then the
other should glow as the conditions are reversed.
3.
Disconnect the power and output cable connector from
the MCW100C,E. Check voltage at the socket end of the
cable for at least 11 Vdc between sockets A and B. If
voltage does not exist across A and B, the cable or the
voltage supply is faulty.
4.
Check the output voltage from C to ground and D to
ground.
5.
If another Grade Controller is available, set it on the
same surface as the other and plug the MS connectors
into the replacement unit. Check system operation. If
the problem disappears, the Controller is defective.
Substitute the replacement controller in its place.
TROUBLESHOOTING
BLN-95-9013