15
Donaldson Company, Inc.
Solid-State Timer Installation
Electrical installation, service
or maintenance work during
installation must be performed by a qualified
electrician and comply with all applicable
national and local codes.
Turn power off and lock out electrical power
sources before performing installation, service,
or maintenance work.
Do not install in classified hazardous
atmospheres without an enclosure rated for
the application.
Timer and Solenoid Specifications
Power to the solid-state timer is supplied to Terminals
L1 and L2, which are intended to operate in parallel
with the fan starter’s low-voltage coil. On fan start-up,
power is supplied to the timer and the preset OFF time is
initiated. At the end of the OFF time, the timer energizes
the corresponding solenoid valve to provide the ON time
cleaning pulse for one diaphragm valve and then steps to
the next until all filters have been cleaned.
To pulse when the fan is OFF, install a toggle switch as
shown on the Solid-State Timer Wiring Diagram. When
the toggle switch is ON, the timer receives power and
energizes the solenoid valves’ pulse-cleaning operation
even though the fan is turned OFF.
The solid-state timer is used to control the filter cleaning
system. Available timers include 3, 6, and 10-pin solenoid
valve control.
Solenoid Connection
The collector is equipped with a solenoid valve (typically
120V) that controls the pulse-cleaning valves, which
clean the filters.
Wire the solenoids to the solid-state timer following the
wiring diagram supplied with the collector. Filter life and
cleaning operation will be affected if not wired correctly.
1. Using the wiring diagram supplied, wire the fan
motor, fan-motor starter, solid-state timer, and
solenoid valves. Use appropriate wire gauge for
rated amp load as specified by local codes.
2. Plug the program lug into the pin that corresponds
with the number of solenoid valves controlled for
3-10 PIN. For 20 and 32 PIN solenoid controls, set
the switch positions on the DIP switch labeled LAST
CHANNEL to the corrersponding number of pulse
valves using the chart printed on the timer board.
3. With power supply ON, check the operation of the
timer and valves. The valves should open and close
sequentially at factory set 15-second intervals
(10-second intervals on VH and VL 2-20 and 3-30
units).
4. If a gauge or similar device is used to control the
solid-state timer, the jumper on the pressure switch
portion of the timer should be removed. The solenoid
valves pulse only when the differential pressure
reaches the high-pressure setpoint. The valves will
continue to pulse until the low-pressure setpoint is
reached.
The solid-state timer voltage must
match the voltage of the rating of
the timer provided (typically 120VAC, 240 VAC
also available).
Do not mount the solid-state timer directly
to the collector as mechanical vibration can
damage the timer.
Summary of Contents for PowerCore VH 1-4
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