TYPICAL APPLICATIONS

• Replace Variable Transformers

• Infra-Red Heating Pan

• Infra-Red Ink Drying

• Heat Sealing

• Packaging

• Infra-Red Paint Drying

Model 18D-H SCR power controls utilize phase-angle firing to provide infinitely variable control of single-phase voltages to variable resistance loads such as quartz/tungsten tubes without derating These units are solid state replacements for variable transformers, saturable core reactors, electromechanical contactors and mercury relays. Power semiconductors replace contacts and brushes to switch electric power without moving parts, and when operated within their stated ratings for current voltage, and temperature, have no known MIBF or life expectancy rating.

INNOVATIVE ADVANCED TECHNOLOGY: Three Pillars Of Protection

18D-H SCR controls incorporate exclusive design features to protect power semiconductor components against damage:

1> Unique "Vbo Clamping" provides unmatched protection for power semiconductors against transient voltage spikes common on industrial power mains.

2> '2 millisecond" fuses protect semiconductors against short-circuit faults. Payne Engineering SCR controls are the only power controls in the industry equipped with factory tested and approved fuses coordinated with power semiconductors.

3> Proprietary heatsinks are engineered in-house, coordinating finite-element analysis (FEA) with on-site lab tests. Payne Engineering SCR controls operate at 50⁰C (122⁰F) ambient temperatures with no derating.

APPLICATION FLEXIBILITY

Standard configuration of all Series 18D-H SCR controls is manual control via a 2700 turn potentiometer (included). A 1/2 second soft-start feature minimizes the current inrush to variable-resistance loads when first energized. Standard options allow for automatic open- or closed-loop control in response to an analog control signal from a temperature controller, PLC I/O module, or other external source. Other options allow controls to be configured for the specific requirements of each application.

SPECIFICATIONS

• Power Circuit: inverse-parallel semiconductors selected for Vbo Clamping transient protection, with parallel R-C circuit for dv/dt protection. Current-clamping 2millisecond power fuses in series with the power semiconductors provide short-circuit protection.

• Control Circuit: all solid state circuitry supplies synchronized gate firing pulses to each thyristor via isolating pulse transformers. Mains Frequency: 50 60 Hz standard. Other frequencies available as special order (consult factory).

• Output Voltage: 0 to nominal input voltage, infinitely variable. Overall Efficiency: 98.5 to 99 
• Power Loss: approximately 1-2 watts/ampere/switched pole.
• Voltage Drop Across Power Circuit at 100% Output: 1-2 volts maximum per switched pole.
• Proof Voltage: (isolation between power circuit, control circuit and ground) greater than 2 kV.
• Control Input: manual control via 75K Ohm 2 watt potentiometer with integral On/Off switch and calibrated dial plate standard.
• Control Power: 5 watts maximum, derived from 12 VA isolation control transformer on all units.
• Fuse Protection: 2 millisecond 1²t fuses are factory tested and coordinated with all power semiconductors, considering:

a. fuse element melt time tmelt;
b. peak melt current lmelt;
c. arc quench time tarc;
d. peak arc current larc.

• Transient Voltage Protection: voltage breakover (Vbo) protection with R-C filters for dv/dt protection.
• Ambient Temperature Range: -10 to +50⁰C.

• Terminal Connections: 10-30 amp use Bakelite or thermoplastic blocks 50 amps and larger use screw lugs or stud bolts.

Secure Online Ordering Delivery time for the following products: Typically not in stock. Processed/shipped in 17-24 working days or less.  The transit time to you depends on your selected UPS/FedEx shipping method, the cost of which will be displayed in your shopping cart.
Item ID	Catalog #	INPUT VOLTS	PHASE	MAX. AMPS	KVA @ MAX RATED VOLTS	Price	Click "Select" below
PAYNE10019	18D-2-10Hi	240	Single	10	2.4	$177.10
PAYNE10059	18D-2-10Hi with Enclosure	240	Single	10	2.4	Call for Price
PAYNE10066	18D-2-30H	240	Single	30	7.2	$273.70
PAYNE10009	18D-2-30H with Enclosure	240	Single	30	7.2	Call for Price
PAYNE10039	18D-2-80H	240	Single	80	19.0	$489.90
PAYNE10029	18D-2-80H-with Enclosure	240	Single	80	19.0	Call for Price