How Much Power Should a 3-Phase SCR Regulator Have for Heater Control?
Share
When selecting a 3-phase SCR (Silicon Controlled Rectifier) power controller, the most important factor is matching the controller's specifications to your heating system's power requirements. Whether you're using a 380V, 220V, or 440V power supply, proper selection ensures efficient heating performance and longevity of your equipment.
Choosing an SCR Power Controller for a 380V Power Supply
1. Determine the Heater’s Power
To select the correct SCR power controller, start by calculating the heater’s power. Divide the heater's rated power by a safety factor of 0.8. The SCR controller’s power rating should be at least this value.
2. If Only Current is Known
In cases where only the current is available, use the formula:
P = √3 * U * I
Where P is the power, U is the voltage (380V in this case), and I is the current. Once the power is calculated, proceed with step 1.
Choosing an SCR Power Controller for 220V or 440V Power Supply
For SCR controllers operating with 220V or 440V, the selection process is similar, with the primary difference being the adjustment for voltage differences.
3. Adjusting for 220V or 440V
The same power controller has the same permissible heat generation under different load power supplies, that is, its permissible passing current is the same. According to this principle, 220V and 440V selection can be converted to 380V selection:
Heater Power ÷ Voltage × 380V ÷ 0.8 = Minimum SCR Power Controller Rating
By following this formula, please ensure that the result value is not bigger than the controller's power.
Quick Reference Table for SCR Power Controller Selection
Here’s a quick guide to choosing the right SCR power controller based on the heater's voltage and power:
| 220V Heater Power (kW) | 380V Heater Power (kW) | 440V Heater Power (kW) | SCR Power Controller Selection |
|---|---|---|---|
| 0 < P ≤ 7.41 | 0 < P ≤ 12.8 | 0 < P ≤ 14.82 | APR3H380V-16KW |
| 7.41 < P ≤ 10.19 | 12.8 < P ≤ 17.6 | 14.82 < P ≤ 20.38 | APR3H380V-22KW |
| 10.19 < P ≤ 13.89 | 17.6 < P ≤ 24 | 20.38 < P ≤ 27.79 | APR3H380V-30KW |
| 13.89 < P ≤ 18.53 | 24 < P ≤ 32 | 27.79 < P ≤ 37.05 | APR3H380V-40KW |
| 18.53 < P ≤ 23.16 | 32 < P ≤ 40 | 37.05 < P ≤ 46.32 | APR3H380V-50KW |
| 23.16 < P ≤ 27.79 | 40 < P ≤ 48 | 46.32 < P ≤ 55.58 | APR3H380V-60KW |
| 27.79 < P ≤ 32.42 | 48 < P ≤ 56 | 55.58 < P ≤ 64.84 | APR3H380V-70KW |
| 32.42 < P ≤ 37.05 | 56 < P ≤ 64 | 64.84 < P ≤ 74.11 | APR3H380V-80KW |
| 37.05 < P ≤ 41.68 | 64 < P ≤ 72 | 74.11 < P ≤ 83.37 | APR3H380V-90KW |
| 41.68 < P ≤ 46.32 | 72 < P ≤ 80 | 83.37 < P ≤ 92.63 | APR3H380V-100KW |
| 46.32 < P ≤ 50.95 | 80 < P ≤ 88 | 92.63 < P ≤ 101.89 | APR3H380V-110KW |
| 50.95 < P ≤ 61.14 | 88 < P ≤ 105.6 | 101.89 < P ≤ 122.27 | APR3H380V-132KW |
| 61.14 < P ≤ 69.47 | 105.6 < P ≤ 120 | 122.27 < P ≤ 138.95 | APR3H380V-150KW |
| 69.47 < P ≤ 74.11 | 120 < P ≤ 128 | 138.95 < P ≤ 148.21 | APR3H380V-160KW |
| 74.11 < P ≤ 81.05 | 128 < P ≤ 140 | 148.21 < P ≤ 162.11 | APR3H380V-175KW |
| 81.05 < P ≤ 92.63 | 140 < P ≤ 160 | 162.11 < P ≤ 185.26 | APR3H380V-200KW |
| 92.63 < P ≤ 101.89 | 160 < P ≤ 176 | 185.26 < P ≤ 203.79 | APR3H380V-220KW |
| 101.89 < P ≤ 115.79 | 176 < P ≤ 200 | 203.79 < P ≤ 231.58 | APR3H380V-250KW |
| 115.79 < P ≤ 129.68 | 200 < P ≤ 224 | 231.58 < P ≤ 259.37 | APR3H380V-280KW |
| 129.68 < P ≤ 138.95 | 224 < P ≤ 240 | 259.37 < P ≤ 277.89 | APR3H380V-300KW |
| 138.95 < P ≤ 148.21 | 240 < P ≤ 256 | 277.89 < P ≤ 296.42 | APR3H380V-320KW |
| 148.21 < P ≤ 162.11 | 256 < P ≤ 280 | 296.42 < P ≤ 324.21 | APR3H380V-350KW |
| 162.11 < P ≤ 185.26 | 280 < P ≤ 320 | 324.21 < P ≤ 370.53 | APR3H380V-400KW |
| 185.26 < P ≤ 208.42 | 320 < P ≤ 360 | 370.53 < P ≤ 416.84 | APR3H380V-450KW |
| 208.42 < P ≤ 231.58 | 360 < P ≤ 400 | 416.84 < P ≤ 463.16 | APR3H380V-500KW |
| 231.58 < P ≤ 254.74 | 400 < P ≤ 440 | 463.16 < P ≤ 509.47 | APR3H380V-600KW |
| 254.74 < P ≤ 277.89 | 440 < P ≤ 480 | 509.47 < P ≤ 555.79 | APR3H380V-600KW |
| 277.89 < P ≤ 291.79 | 480 < P ≤ 504 | 555.79 < P ≤ 583.58 | APR3H380V-630KW |
Conclusion
Choosing the right SCR power controller is crucial for the optimal performance of your heating system. By following the power calculations and selecting the appropriate controller based on the heater’s power and voltage, you ensure that the system operates efficiently and reliably. The provided table is a quick and effective guide to simplify the selection process. If you need further assistance, don't hesitate to reach out to us for personalized advice.