A three phase microprocessor based firing circuit is a populated printed circuit board primarily designed for incorporating into three phase power control assemblies for the control of thyristors (SCR’s). The unit is available in various supply voltage capabilities. Phase wiring installation is kept to a minimum, with simple gate/cathode outputs and no necessity for external phasing supply transformers.
Auto Phase Rotation correction & Phase-Loss detection
Switch selectable phasing reversal
Control type: Phase angle, Burst fire, or Phase angle and Burst fire combination
Analogue or digital input signal control options (opto isolated)
Load type selection switch, for resistive or inductive applications
Output status LED indication
Current limit facility, switch selectable with LED indication
Over current latching trip to 120% of maximum, with LED indication
Adjustable ramp control 0 to 30 seconds
Applications are universally acceptable for AC, DC, resistive or most inductive loads via thyristor pairs on three phase assemblies
SCR Power handling gives smooth proportional control to all types of industrial processes which includes furnaces, electroplating, controlled rectifiers and transformers
在固定重復周期（通常為 1 至 10 秒），完整電源周期的數目是變化的，從而改變占空比或接通/斷開時間比。 觸發脈沖與電源的過零時間一致，從而確保在使用電阻性負載時不產生 RFI。
| 屬性 | 數值 |
|---|---|
| 安裝類型 | 螺絲安裝 |
| 輸出隔離 | 3500Vrms |
| 輸入電壓交流 | 440V 交流 |
| 尺寸 | 203 x 108 x 40mm |
