Maintenance And Repair - D-M-E VCTB-4000 User Manual

timer. Timer 2 sets the duration the valve is
open. This is referred to as the "on" timer.
Use the SET/LOCK button on the front of
the timer to select between the delay timer
(Timer 1) and the on timer (Timer 2). The
Timer unit front panel will display which
timer is selected. (See page 8)
Use the up and down arrow buttons below
the display to set the desired time value.
Each time value can be set to any value
between 00.00 seconds to 99.99 seconds.
To set any valve to open immediately, set
the delay timer (Timer 1) value to 00.00
seconds.
If the sum of the delay and the on timer is
set to a value larger than the time the
trigger signal is active, internal electronics
will automatically reset the timers at the end
of the trigger signal.
When triggered, "Timer 1" (delay timer) of
each of the timers will be displayed. The
timer will count down until it reaches zero.
When Timer 1 reaches zero, Timer 2 (on
timer) will be displayed and the timer will
count down until it reaches zero. If the
Timer 1 value is zero, Timer 2 will be
displayed when the
displayed, Timer 1 will not be displayed.
Proper setting of each of the "on" timers is
determined by part weight or size. For most
applications, the on timer should run
through the injection fill phase and into the
pack (and hold, if present) phases of the
injection molding machine.
NOTE: The TEST buttons on the front panel
do not actuate the timers. The buttons
bypass the timers and actuate the solid
state relays directly.
The test buttons below each of the timers
can be used to verify correct connection to
the valve gates. Warning!: verification
should be performed with the operator
gates closed to prevent injury from hot
plastic.
Verify correct operation of the timers once
the trigger signal is applied.
D-M-E Company
trigger signal is
VCTB-4000
ED-0109-OT-024-( Preliminarry Rev E)

MAINTENANCE AND REPAIR

NOTE: DISCONNECT POWER BEFORE
SERVICING. ONLY ELECTRICIANS OR
TRAINED SERVICE
SHOULD REMOVE ACCESS PANELS TO
SERVICE INTERNAL COMPONENTS.
Timers Do Not Illuminate
Make sure controller is plugged in and that
outlet power is on. Some molding machine
outlets may not be energized if machine
power is off.
If controller is plugged in and outlet has
power, check fuses 1 and 2 on top of the
controller. See the figure of the top plate.
Use only ABC-3 fuses as replacements.
(See page 7).
If a single timer does not illuminate, it may
require replacement. See timer replacement
at the end of this section. The timers are
designed to operate for 10 million cycles so
they should not require replacement very
often.
Timers Illuminate But Don't Run
Check the trigger signal cable and make
sure it is connected. If the cable is
connected, disconnect the cable from the
controller and ensure the molding machine
provides a contact closure when expected
by checking the signal between pins A and
C.
If you can see a contact closure between
pins A and C. You can also check for the
presence of 24 volts DC between pins A and
C of the trigger signal connector on the top
of the unit.
Timer(s) Run But Valve(s) Don't Open
Check cable connection(s) between the
controller and the valve(s). If cable damage
is suspected, replace the cable.
If the valve cable is determined to be good,
check the small fuses on top of the internal
solid state relays. If any of these fuses are
determined to be open, check the affected
zone valves and cable connections for short
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