Electrostatic Precipitator Rapper Control Basics

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 Power Supply Card Output Card Power Module Power and Control Transformer • Display • Backlit Liquid Crystal (LCD) • Alphanumeric • Four Lines of Text • 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 Power Supply Card Output Card Power Module Power and Control Transformer • Keypad • Sixteen Key • Tactile Feel • Hermetically Sealed • Dual Function • Parameter Selection • Numeric Selection • Individually Labeled Redkoh Industries Precipitator operating and optimizing products

Major System Components Keypad and Display Unit Power Board Power Supply Card Output Card Power Module Power and Control Transformer The Keypad and Display Unit is used for field programming the control. Redkoh Industries Precipitator operating and optimizing products

Major System Components Keypad and Display Unit Power Board Power Supply Card Output Card Power Module Power and Control Transformer The Power Board contains a duplicate processor that contains the backup program and any field changes that have been made. The Keypad and Display Unit could actually be removed after programming is complete and the rapper control will continue to operate. This board also directs the firing pulse to the appropriate output card and point on that card. Redkoh Industries Precipitator operating and optimizing products

Major System Components Keypad and Display Unit Power Board Power Supply Card Output Card Power Module Power and Control Transformer The Power Supply Card contains the low voltage power supplies that feed the card rack and the Keypad and Display Unit. Redkoh Industries Precipitator operating and optimizing products

Major System Components Keypad and Display Unit Power Board Power Supply Card Output Card Power Module Power and Control Transformer The Output Card acts as a switch to send the rapper firing pulse to the appropriate output point/rapper. Redkoh Industries Precipitator operating and optimizing products

Major System Components The Power Module converts the AC from the Power Transformer to full wave DC to power the rapper coil. It also sends the firing pulse to the card cage where it is directed to the proper output by the Power Card. 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 Power Supply Card Output Card Power Module Power and Control Transformer The Power transformer supplies the AC voltage to the Power module, while the Control transformer provides the AC voltage to the Power Supply Card. Redkoh Industries Precipitator operating and optimizing products

Cycle Clock • An MRCcan 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

Rapper Intensity • There are three ways to adjust rapper/vibrator intensity: • 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

Questions? Redkoh Industries

Electrostatic Precipitator Rapper Control Basics