Avatar Instruments - A1P Series Single Phase SCR Power Controllers

The A1P is a proportional, infinitely variable power controller capable of delivering 0-97% of the applied line voltage to the directly connected electric heaters. The A1P will not control transformers or motors. This is accomplished by phase angle firing a pair of inversely connected SCR's. Modular construction allows for simple and solderless field serviceability. There are four field replaceable items:

Printed circuit board
Fuse
Dual SCR package
MOV (metal oxide varistor)

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Unit of Measure

Items	A1P-12-30 A1P-12-30 Series Single Phase SCR Power Controller	A1P-12-40 A1P-12-40 Series Single Phase SCR Power Controller	A1P-12-60 A1P-12-60 Series Single Phase SCR Power Controller	A1P-12-80 A1P-12-80 Series Single Phase SCR Power Controller	A1P-12-100 A1P-12-100 Series Single Phase SCR Power Controller
Voltage Designations	N/A 120 VAC 50/60 Hz
Load	N/A 30 AMPS	N/A 40 AMPS	N/A 60 AMPS	N/A 80 AMPS	N/A 100 AMPS
Output Voltage	N/A 0 to 97% of input voltage
Control Signal	N/A 4 to 20 mA at 5 volts DC, 250 Ohms
Linearity	N/A < 5% deviation
Response Time	N/A <12 mS (std unit, non soft start)
Cooling	N/A Convection: 30-100 amps Fan (120VAC): 150-1200 amps
Thermostat	N/A 190 ºF (fan cooled units only)
Power Dissipation (Watts)	N/A 1.2 x maximum current
Net Weight	N/A 3.50 Pound	N/A 6 Pound	N/A 6 Pound	N/A 6 Pound	N/A 6 Pound
Shipping Weight	N/A 4 Pound	N/A 8 Pound	N/A 8 Pound	N/A 8 Pound	N/A 8 Pound
Minimum Wire Gauge (Copper Wire Only- 90 ºC Temp Wire)	N/A 10 AWG	N/A 8 AWG	N/A 6 AWG	N/A 4 AWG	N/A 3 AWG
Wire Lug Torque (90 ºC Temp Wire)	N/A 35 lb/in	N/A 40 lb/in	N/A 45 lb/in	N/A 45 lb/in	N/A 50 lb/in
Lug Size (90 ºC Temp Wire)	N/A 10 AWG	N/A 1/0 - 14	N/A 1/0 - 14	N/A 1/0 - 14	N/A 1/0 - 14
Soft Start	N/A S02-2 Seconds S05-5 Seconds S10-10 Seconds S20-20 Seconds
Current Limit	N/A CL- Current Limit CLP-Current Limit with Panel Mount Potentiometer
Voltage Limit	N/A VL-Standard 1 Turn PCB VL25-25 Turn PCB
Features	N/A UL 508 listed Compact and light weight I²T sub cycle fusing standard 100 % solid state circuitry Over-rated dual SCR power modules Thermostat std on fan cooled units Over-sized heat sink Full power ratings up to 50 °C (122 °F) ambient temperature Optically isolated 4-20 mA input standard Electrically isolated chassis and heat sinks to 600 amps MOV protection on all power SCR's SanRex, SemiKron, International Rectifier and Fairchild semiconductors Double sided FR4 VO-94 rated glass epoxy PCB's
Theory of Operation	N/A The graphs below show phase angle fired voltage output on a 240V power line. The standard input signal (4-20 mA) is applied to the blue input terminal block, processed and fed to an optical coupler. The output of the optocoupler feeds the drive circuitry which is then fed to a pair of inversely connected SCR's. To obtain superior linearity, the line voltage is monitored and optically fed back to the input stage of the controller. An I²T fuse connected in series with the SCR's provides over current protection in the event of external wiring shorts, and or too large of a heater load. Additionally, a MOV (metal oxide varistor) is connected in parallel with the SCR's, providing voltage spike protection to the controller.