SCR Power Controllers for Electrically Heated Processes - Discontinued

SCR70 Series-DISCONTINUED

Zero Crossing or Phase Angle Fired
Single or Three Phase Load Switching
Extends Heater Life. Reduces Thermal Shock
No Maintenance. All Solid State Components
Close Control of Low Mass Heaters
Phase Angle with Soft Start for High Inrush Heaters
No Relay Noise. Contact Arc Noise Eliminated
Semiconductor I2T Fusing
Optically Isolated Control Signal Input

Description

The SCR70 Series Power Controllers are designed to proportion electric power to resistive loads only, such as ovens, furnaces, heat sealers, etc. (NOTE: They are not designed to drive transformers or any inductive load.) The controllers consist of power semi-conductors (SCRs), properly-sized heat sinks, trigger circuitry, and fuses supplied on panels for surface mounting. The power controller accepts a 4 to 20 mA dc output from a temperature controller or can be supplied with manual option using a remote potentiometer.

Operation
The SCR70 Series controllers offers two methods of proportional control; zero-voltage-switched and Phase-angled fired. With the Zero voltage switching mode, the controller switches on complete cycles of the ac supply voltage. The trigger circuit is designed to turn on the SCRs as close as possible to the point where the ac sine wave crosses through zero. In effect, the line voltage is turned on and off and applied to the heaters in whole cycles. With an input of 4 to 20 mA, the output will be off below 4 mA and full on at 20 mA. Proportioning action is obtained by varying the number of cycles on to the number of cycles off. The output will vary from one cycle on and nine cycles off at low input, to all cycles on at maximum input. This output is integrated by the heaters which produce a smoothly proportioning heat output that varies directly with the input signal. With the Phaseangle- fired mode, the power to the load is controlled by governing the point of turn on (firing) of each half cycle of the full ac sine wave.

† All amounts shown in EUR, GBP, or USD
Note: To order a unit with manual input option module and remote pot, add suffix " - M " to model number and add $54 to price.
(OPTIONS SHOWN IN THIS "NOTE" ABOVE ARE PRICED IN US$)

Part Number Builder

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SCR7

Contact our sales team for pricing: sales@omega.co.uk

Option Descriptions:

(1) Single or 3 Phase select from:
1 for Single Phase
3 for 3 Phase

(2) Voltage select from:
Z-1 for 120 Vac Zero-Voltage Switching
P-120 for 120 Vac Phase-Angle Firing
Z-2 for 240 Vac Zero-Voltage Switching
P-208 for 208 Vac Phase-Angle Firing
P-240 for 240 Vac Phase-Angle Firing
Z-4 for 480 Vac Zero-Voltage Switching
P-480 for 480 Vac Phase-Angle Firing

(3) Current select from:
30 for 30 Amps for Zero-Voltage Switching
-030 for 30 Amps for Phase-Angle Firing
60 for 60 Amps for Zero-Voltage Switching
-060 for 60 Amps for Phase-Angle Firing
75 for 75 Amps for Zero-Voltage Switching
-075 for 75 Amps for Phase-Angle Firing
100 for 100 Amps for Zero-Voltage Switching
-100 for 100 Amps for Phase-Angle Firing
150 for 150 Amps for Zero-Voltage Switching
-150 for 150 Amps for Phase-Angle Firing
200 for 200 Amps for Zero-Voltage Switching
-200 for 200 Amps for Phase-Angle Firing

(4) Phase-Angle Firing Items select from:
for Zero-Voltage Switching leave field blank
-S9 for Soft start 9 seconds
-S15 for Soft start 15 seconds
-S30 for Soft start 30 seconds
-S60 for Soft start 60 seconds
-S120 for Soft start 120 seconds
-V for Voltage limit

Note: All combinations may not be valid, check spec sheet for valid part numbers.