9
Donaldson Company, Inc.
Antistatic Grounding Installation
If the collector is equipped with antistatic filters and
bonded construction, then the collector will need to be
grounded by a qualified electrician.
1. Follow the instructions provided by the antistatic
grounding drawing provided.
2. Ground the collector using the grounding lug at the
rear of the collector.
3. Take resistance readings from the filter media to
ground to ensure conductivity. Records results as
indicated on the drawing.
Solid-State Timer Installation
Electrical service or maintenance
work 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.
The solid-state timer is an electronic timer used to
control the filter cleaning system. Available options
include 3, 6, 10, 20, and 32-pin solenoid valve control.
1. Using the supplied wiring diagram, 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.
3. With power supply ON, check the operation of the
solenoid valves. The valves should open and close
sequentially at factory set 10-second intervals.
4. If a Photohelic gauge or similar device is used to
control the solid-state timer and the jumper on the
pressure switch portion of the timer is removed,
the solenoid valves pulse only when the differential
pressure reaches the high-pressure setpoint. The
valves 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 115VAC).
Do not mount the solid-state timer directly to
the unit. Mechanical vibration can damage the
control.
Solenoid Connection
The unit is equipped with 115-V solenoid valves that
control the pulse-cleaning valves, which clean the filters.
One of three types of solenoid enclosures, the
weatherproof NEMA 4 with 3D2 solenoids, the explosion
proof NEMA 7 with 5D2 solenoids, or the explosion proof
NEMA 9 with 5D2 solenoids, is mounted near or on the
unit’s compressed-air manifold.
Wire the solenoids to the solid-state timer following
the wiring diagram supplied with the unit. Filter life and
cleaning operation will be affected if not wired correctly.
Timer and Solenoid Specifications
Power to the solid-state timer is supplied to Terminals L1
and L2, which 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.
NOTICE