400.4 Dwyer DCT1000 Automatic Timer Controller
The DCT1000 was designed for on-demand or continuous cleaning applications. Continuous cleaning
applications do not require external inputs and can be used for time based “on-demand” cleaning through
use of the cycle delay feature. For on-demand applications, the plug-in pressure module can be used to
take full advantage of all the DCT1000 features.
Master Controller Panel Features
Last Output Setup
The Last Output Setup selects the last channel to be activated. When first selected, the display will flash
the last output available in the system. With single board installations, this will be the number of channels
installed, typically 10 or 22. This value becomes more important when multiple modules are installed. The
last output value flashed will be the sum of all channels available in the system.
After the last available channel indication has completed, the currently programmed last channel value is
displayed. This value may be changed using the Up and Down buttons. The minimum value is one while
the maximum value is the maximum number of installed channels, including all expansion modules.
You may restore the factory default setting by pressing both Up and Down simultaneously and holding for
about four seconds. The default value is the maximum number of channels. Pressing Select will change
the setup mode to Time Off Setup.
Time Off Setup
Time Off defines the period of time between solenoid activations when no channels are enabled. This
may be set between one second and 255 seconds. The factory default is 10 seconds. The display will
show the current time off setting when the time off setup mode is entered. The value may be changed
using the Up and Down buttons. Pressing both Up and Down simultaneously and holding for
approximately four seconds will restore the default value of 10. Pressing the Select switch will change the
setup mode to Time On Setup.
Time On Setup
Time On Setup sets the solenoid on time. The display will indicate the currently programmed time on
setting. This is measured in milliseconds. Using the Up and Down buttons, the value may be changed.
The value may be set between 10 msec and 600 msec in 10 msec increments. Pressing the Up and
Down buttons simultaneously for approximately four seconds will restore the factory default value of 100
msec. Pressing the Select button will advance the setup mode to the High Limit setup if the pressure
module is installed. With no pressure, it will step to Cycle Delay Setup.
High Limit Setup
The High Limit Setup, available only with a pressure module installed, sets the pressure at which the
cleaning cycle will begin. This value may be between zero and the pressure module calibration pressure.
Normally, the High Limit should be above the Low Limit. If, however, the High Limit pressure is set below
the Low Limit, the cleaning cycle will begin when the High Limit is exceeded and stop when the pressure
falls below the High Limit. The Low Limit in this case will have no effect. Pressing both Up and Down
buttons simultaneously and holding for about four seconds will restore the factory setting for High Limit to
5.0” w.c. Pressing Select will change the system to the Low Limit Setup mode.
Low Limit Setup
The operation of the Low Limit, available only with a pressure module installed, is identical to the High
Limit except that the default Low Limit pressure is 3.0” w.c. The upper settable value is the calibration
pressure of the pressure module and the lower limit is zero. Pressing Select will change the system to the
High Alarm Setup mode.
High Alarm Setup
The operation of the High Alarm Setup is identical to the High and Low Limit Setup and is only available
when a pressure module is installed. The High Alarm default is 6.0” w.c. The upper settable value is the
calibration pressure of the pressure module and the lower limit is zero. Pressing Select will change the
system to the Low Alarm Setup mode.
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