Electrostatic Precipitator
Rapper Control Basics
Redkoh Industries
MRC-NT
Rapper Control
Components
Features
Functions
Redkoh Industries
Precipitator operating and optimizing products
MRC-NT Rapper Control
How is a rapper
constructed?
Redkoh Industries
Precipitator operating and optimizing products
Purpose of a Rapper
Control System
Energize rappers, electric vibrators, and
air solenoids.
Permit adjustment of the frequency and
duration of energization.
Permit adjustment of the energization
intensity.
Identify faulty devices and type of fault
Redkoh Industries
Purpose of a Rapper
Control System - Continued
Allow for storage of multiple programs
for various operating conditions.
Redkoh Industries
Major System Components
Keypad and Display Unit
Power Board
Power Supply Card
Output Card
Power Module
Power and Control Transformer
Redkoh Industries
Precipitator operating and optimizing products
Major System Components
Keypad and Display Unit
Power Board
Display
Power Supply Card
Backlit Liquid Crystal (LCD)
Output Card
Alphanumeric
Power Module
Four Lines of Text
Power and Control Transformer
Twenty Characters per line
Redkoh Industries
Precipitator operating and optimizing products
Redkoh Industries
Precipitator operating and optimizing products
Major System Components
Keypad and Display Unit
Power Board
Keypad
Power Supply Card
Sixteen Key
Output Card
Tactile Feel
Power Module
Hermetically Sealed
Power and Control Transformer
Dual Function
Parameter Selection
Numeric Selection
Individually Labeled
Redkoh Industries
Precipitator operating and optimizing products
Redkoh Industries
Precipitator operating and optimizing products
Major System Components
Keypad and Display Unit
Power Board
The Keypad and Display Unit is used for
Power Supply
Card
field
programming the control.
Output Card
Power Module
Power and Control Transformer
Redkoh Industries
Precipitator operating and optimizing products
Major System Components
The Power Board contains a duplicate
processor that contains the backup
Keypad and Display Unit
program and any field changes that
Power Board have been made. The Keypad and
Power Supply Card
Display Unit could actually be removed
after programming is complete and the
Output Card
Power Module rapper control will continue to operate.
This board also directs the firing pulse
Power and Control Transformer
to the appropriate output card and
point on that card.
Redkoh Industries
Precipitator operating and optimizing products
Redkoh Industries
Precipitator operating and optimizing products
Major System Components
Keypad and Display Unit
Power Board
Power Supply Card
Output Card
The Power Supply Card contains the
Power Module
low voltage power supplies that feed
Power and
Transformer
the Control
card rack
and the Keypad and
Display Unit.
Redkoh Industries
Precipitator operating and optimizing products
Redkoh Industries
Precipitator operating and optimizing products
Major System Components
KeypadThe
andOutput
DisplayCard
Unitacts as a switch to
send the rapper firing pulse to the
Power Board
appropriate output point/rapper.
Power Supply Card
Output Card
Power Module
Power and Control Transformer
Redkoh Industries
Precipitator operating and optimizing products
Redkoh Industries
Precipitator operating and optimizing products
Major System Components
The Power Module converts the AC
from the Power Transformer to full
wave
DCDisplay
to power
the rapper coil. It
Keypad
and
Unit
also sends the firing pulse to the card
Power Board
cage where it is directed to the proper
Power
Supply
output
by Card
the Power Card.
Output Card
Power Module
Power and Control Transformer
Redkoh Industries
Precipitator operating and optimizing products
Redkoh Industries
Precipitator operating and optimizing products
Major System Components
The
Power
transformer
supplies the AC
Keypad
and
Display
Unit
voltage to the Power module, while the
Power Board
Control transformer provides the AC
Powervoltage
Supplyto
Card
the Power Supply Card.
Output Card
Power Module
Power and Control Transformer
Redkoh Industries
Precipitator operating and optimizing products
Redkoh Industries
Precipitator operating and optimizing products
Cycle Clock
•An MRC can have any number of cycle clocks.
•Each cycle clock controls a chosen group of rappers. The timing of
the cycle clock is the time period between consecutive energization
of the same rapper in a rapper group.
•A rapper group is any number of rappers controlled by a cycle clock.
•The cycle clock is programmable between one second and 100
hours in one-second increments.
•Upper and lower limits of cycle clock timing are be pre-programmed
into the MRC.
Redkoh Industries
Precipitator operating and optimizing products
Wait Cycle Clock
•Each cycle clock has a counterpart wait cycle clock.
•The wait cycle time is the time period between
energization of the last rapper in a rapper group and the
re-energization of the first rapper in the same group.
•The wait cycle clock for rappers is programmable from
zero seconds (no wait) to 100 hours in one-second
increments.
Redkoh Industries
Precipitator operating and optimizing products
Redkoh Industries
Precipitator operating and optimizing products
Rapper Intensity
There are three ways to adjust rapper/vibrator
intensity:
1. Each device individually
2. Each group of devices individually
3. All devices simultaneously
For magnetic impact type rappers, the intensity is
measured and adjusted in inches of hammer
travel.
Redkoh Industries
Precipitator operating and optimizing products
Repetitive Energization
The rappers in each group can be
programmed to energize from 1 to 9 times
before the next rapper in the same group is
energized.
Select
Any rapper can be selected to display its
operating parameters (intensity, wait and
cycle clock number, and wait and cycle
clock timing).
Redkoh Industries
Precipitator operating and optimizing products
Step
Once a rapper has been selected, the
control can be advanced sequentially to
display all rapper parameters, one at a
time.
Repeat
Repeatedly energizes any chosen rapper
every 3 seconds, for troubleshooting
purposes.
Redkoh Industries
Precipitator operating and optimizing products
Sequence
Energizes all rappers in a chosen group at a
faster than normal clock time. This rapidly cleans
the electrodes associated with a chosen rapper
group.
It is useful if excessive sparking caused by
buildup is noted, or to clean various areas of the
precipitator prior to internal inspections.
This parameter also allows all rappers in all
groups to be energized in sequence at a fast
rate, and allows all internal electrode surfaces to
be cleaned rapidly during precipitator offline
periods.
Redkoh Industries
Precipitator operating and optimizing products
Master Intensity
•Allows the intensity of rappers in the
same group or on the entire precipitator
to be increased or decreased
simultaneously.
•This is very useful for fine-tuning the
rappers/vibrators during fuel switching.
Redkoh Industries
Precipitator operating and optimizing products
Multiple Program Storage
•Six separate and distinct rapper programs are
available to the user.
•They are mutually exclusive of one another and allow
field programming of timing and intensity for such
operating conditions as high loads, upset conditions,
varying fuel sources, special maintenance routines, etc.
•Once programmed into memory, the separate
programs can be called into use with a few simple
keystrokes.
•The factory default program is always available for
immediate recall.
Redkoh Industries
Precipitator operating and optimizing products
Rapper Failure Alarms
•The operation of each rapper is constantly monitored as it
is energized. Should a fault occur (short or open rapper
coil or field wiring), the single rapper is removed from
service; the operation of the other rappers/vibrators is
unaffected.
•When a rapper is removed from service, the number of
that rapper is displayed by pressing the alarm check key.
•If more than one rapper has been removed from service,
repeatedly pressing the alarm check key will display these
rappers in numerical order.
Redkoh Industries
Precipitator operating and optimizing products
Typical Rapper Roof Layout
Redkoh Industries
Typical Rapper Control
Redkoh Industries
Typical Rapper System
Redkoh Industries
Typical Rapper System
Redkoh Industries
Questions?
Redkoh Industries