Application Notes Application Notes & Glossary& Glossary The Application Notes that follow are a collection of circuits utilizing products found in this catalog. These circuits illustrate possible uses in a variety of applications. It is strongly recommended that you contact our Technical Assistance Team (see below) before using any of this information. Application Notes Alternating & Duplexing Relays Alternating .......................................................................................................................13.3 Duplexing ........................................................................................................................13.3 Duplex Panel with Latching Pump Down Operation .......................................................13.3 Timer Replaces Expensive Float Switch .........................................................................13.4 Operation with Time Delay Installed ................................................................................13.4 Current Sensors Measuring Contamination with a Current Sensor ...........................................................13.5 Using Current Sensing to Detect a Failed Lamp .............................................................13.5 Sensing Failed HID Lighting ............................................................................................13.5 Feed Rate Control Using Sensing ...................................................................................13.6 Using Current Sensors for: Improved Part Counting, Counting Motor Starts, As an Hour Meter Interface ..............13.6 Dull Tool Detection ..........................................................................................................13.7 Load Status Indication - Local and Remote ....................................................................13.7 Sensing Operation of Heat Tapes ....................................................................................13.7 Failed Heater - Fast Visual Indicator Single Phase Heater ..............................................13.8 Three Phase Heater .........................................................................................................13.8 Three Phase Heater Unsupervised Equipment ...............................................................13.9 Multiple Turns to Increase Sensitivity ..............................................................................13.9 The Operation of One Load Starts Another Load Operating Commercial Oven Starts Exhaust Fan ............................................................................13.10 Laundry Dryer Starts Exhaust Fan ..................................................................................13.10 Interlock Two Loads Using Current Sensing ...................................................................13.10 Window Current Sensing for Pump Protection ...............................................................13.11 External Current Transformer ..........................................................................................13.11 HVAC Timers Bypass Timing Allows Low Temperature Starting of an Air Conditioner..................................................13.12 Low Pressure Switch in Compressor Relay Circuit .........................................................13.12 Anti-Short Cycle Anti-Short Cycle and Random Start Protection ..............................................................13.13 Debouncing - Demand Reduction Random Start Sequencing ..............................................................................................13.13 Debouncing - Preventing Contact Chatter ......................................................................13.13 Fan Delays Exhaust Fan Delay ...........................................................................................................13.14 Prepurge ..........................................................................................................................13.14 (Continued on next page) Low Voltage Products & Systems 13.1 ABB Inc. • 888-385-1221 • Technical assistance 800-377-7722 • www.ssac.com 1TRC 001 009 C0202 Index, cont. Application& Glossary Notes Liquid Level Controls Single Probe Control .......................................................................................................13.15 Sensitivity to Ignore Foam ...............................................................................................13.15 Dual Probe Control ..........................................................................................................13.16 Seal Leak Detection ........................................................................................................13.16 Timers Accumulative Timing Accumulative Interval Timing ..........................................................................................13.17 Single Timing Circuits Contact Chatter Elimination ............................................................................................13.17 Compound Timing Functions Sequencing - Independent Adjustment Sequence (Single Cycle) ..................................13.18 Staging (ON and OFF) .....................................................................................................13.18 Dual Momentary Timing (With Lockout) ..........................................................................13.19 Using Proximity and Photoelectric Switches with Timers The Characteristics of Proximity and Photoelectric Switches ........................................13.19 Plug-in Timers .................................................................................................................13.19 Pulse Shaping .................................................................................................................13.19 Solid State Timers ................................................................................................ 13.19, 13.20 Leakage Current (control of) ............................................................................................13.20 Definite Purpose Timing Random Start ..................................................................................................................13.21 Part Winding Start ...........................................................................................................13.21 Thermistor Controlled Timer ............................................................................................13.21 Air Compressor Drain, Automatic Operation ...................................................................13.22 Flow Monitor ....................................................................................................................13.23 Pump Control ..................................................................................................................13.23 Motion Detector Zero Speed Switch ..........................................................................................................13.23 Voltage Monitors Motor Protection Applications Load Side Monitoring ......................................................................................................13.24 Restart Alarm Buzzer/Flasher ..........................................................................................13.24 Delayed Restart ...............................................................................................................13.24 Restart Bypass Delay ......................................................................................................13.25 Compressor Anti-Short Cycle Lockout Delay .................................................................13.25 Protection & Control Understanding Voltage Faults - Voltage Unbalance ........................................................13.26 Calculating Percent Overheating .....................................................................................13.26 Three Phase Voltage Monitor Universal Voltage Monitor Controls Switching of a Transfer Panel .................................13.27 Universal Voltage Monitor in a Motor Starter ..................................................................13.27 Glossary of Terms Glossary .............................................................................................................................13.28 13.2 Low Voltage Products & Systems 1TRC 001 009 C0202 ABB Inc. • 888-385-1221 • Technical assistance 800-377-7722 • www.ssac.com Application Notes Alternating & Duplexing Relays & Glossary Application Notes Alternating: Power must be applied at all times. When the level Duplexing: When an Alternating Relay is internally cross wired, in the tank rises to the normal level, the Lead Float Switch closes. the normal alternating operation is extended to include duplexing. Pump “A” is turned on via Pump “A” contactor, and will remain in If the Lead Float Switch cycles as previously explained, normal this condition until the Lead Float Switch opens. When the Lead alternating operation will occur. If the Lead Float Switch and Float Switch opens, the ARP relay contacts transfer. When the level the Lag Float Switch close simultaneously, due to a heavy flow in the tank rises again to the normal level, the Lead Float Switch into the tank, both pumps A & B will be energized. The ability to closes, energizing Pump “B” via Pump “B” contactor. Pump “B” alternate the pumps during normal work loads and then operate will remain energized until the Lead Float Switch opens. The ARP both when the