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Keywords:Vectrol,SOLID STATE
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Vectrol Inc.
SCR POWER CONTROLLER
SINGLE PHASE, PHASE PROPORTIONING
This unique design was created to provide a low cost, small size, high performance SCR Power Controller. The VPAC 500 Series is the single-phase control version suitable for all loads up to 83 amperes continuous from 120 to 480 volts. This unique packaging design permits the combination of a standard milliamp controller with manual operation, amplifiers for closed loop systems, and current limit in the same compact unit. Figures 1, 2, 3 and 4 illustrates the various functional combinations.
The VPAC 500 Series incorporates a complete range of protection features which are generally only available as optional features on other power controllers. They include: high P.I.V. rated SCR's; hard firing gate pulses; fast blow fuses and transient voltage networks. A Vi second soft start circuit permits operation into all types of loads including transformers.
DESIGN FEATURES
PROTECTION
dv/dt network di/dt protection Subcycle I^t fuse Voltage clipping network Hard firing gate pulse
ISOLATION
Transformer isolation between signal, load and ground high potential tested at 2000 volts RMS.
BACK TO BACK SCR's
SOFT START AND AUTOMATIC RESTART
ALL SOLID STATE
SMALL SIZE
TYPICAL APPLICATIONS
VARIABLE AUTOTRANSFORMER
Potentiometer Control TEMPERATURE CONTROL
Milliamp input from your Controller Manual Control TEMPERATURE CONTROL
Thermistor or Platinum Probe input POWER SUPPLY
DC voltage regulation Closed loop with DC feedback POWER SUPPLY
DC voltage and current regulation. Closed loop with DC feedback from 50 millivolt shunt.
TWO PLANE MOUNTING
BULLETIN 3105
Figure 1. VP AC 500 with "LE" Option
FUNCTIONAL VARIATIONS OF VPAC 500 SERIES
Figure 2. VPAC 500 with "LA " Option
SPECIFICATIONS
POWER SECTION
AC Supply Voltage: Operates over a range of from +10% to -15% of rated line voltages of 120. 208, 240, 277, 380,480 at 50 or 60 Hz.
Soft Start: XA second soft-start circuit gradually applies control so that output goes from zero to full output in this period.
Type of Load: All loads - resistive, inductive, transformer, lamp and capacitive.
Ambient Temperature: 45° C at rated current
Protective Networks: Fast-blow subcycle fuse, dv/dt
network and transient voltage clipping network.
Output Voltage: 0 to 100% adjustable
AC Load Current Surge: 1 second - non repetitive
30 amp Models.........80 amps
42 amp Models......... 200 amps
63 amp Models......... 250 amps
83 amp Models......... 400 amps
One cycle - non repetitive maximum
30 amp Models......... 200 amps
42 amp Models......... 500 amps
63 amp Models......... 600 amps
83 amp Models......... 1000 amps
CONTROL SECTION-OPTIONS
Manual Control: The version without options provides manual control thru an external 2500 ohm. 1 watt potentiometer. This provision is also included in the "E", "L" and "LE" options.
The manual and milliamp signals can be used to provide an automatic or manual mode thru the addition of an external switch. The manual control can also be used to establish a preheat setting level. On Models that include current limit, the current limit will override the manual control setting.
Milliamp Control Signal: On the adjustable input signal option, gain and offset potentiometers for adjustment to conventional milliamp signals such as 1-5 mA, 3-7 mA, 4-20 mA etc.
Current Limit (Current transformer included): Adjustable from approximately 50 to 100% of rated current.
Current Regulation: DC feedback from 50 mv shunt -±1% regulation. Regulation range — 10% to 100%.
Voltage Regulation: DC feedback voltage — 0 to 6 VDC. Regulation range 0 to 100%, regulation.
CURRENT RATINGS (AMPERES)	
MAXIMUM CONTINUOUS CURRENT	FUSE RATING
30	30
42	50
63	70
83	100
DIMENSION CONFIGURATION
Repositioning feet provides for two plane mounting of the unit. Rotating feet 90 degrees clockwise from view shown allows mounting of unit in the opposite plane.
DIMENSIONS
Vectrol Inc.
MODEL NUMBER	DIMENSIONS IN INCHES					
	W	L	D	A	B	C
VP AC 50 -	5	11-3/8	6-3/4	10-5/16	3-3/8	9
VP AC 60 -	6	16-1/2	7-1/4	15-3/4	3-3/8	14-3/4