Solid State Relays
Features
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SV Dimensions: Inches (mm) |
DIN-A-MITE
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The DIN-A-MITE family is the ideal solid state replacement for mercury displacement relays in an easy-to-install, compact, touch-safe package. The solid state power controllers provides SCR control, heatsink, wiring and touch-safe exterior in one package. By designing the DIN-A-MITE as a total power controller unit, the need to prep wires for terminals, find the right heatsink and determine adequate terminations is eliminated. It's a complete package you can install easily with Control Confidence.
Four DIN-A-MITE styles meet most power controller needs with ratings from 18 to 100 amps with voltages from 24 to 600V~(ac) The four models match load requirements with 1-phase, 3-pase/2-leg and 3-phase/3-leg switching. The controllers also provide a convenient DIN rail and sub-panel mount package. DIN-A-MITE® Style A DIN rail and back panel mounting is standard on every controller. Capabilities include single-phase zero cross switching up to 25 amps at 600V~(ac). Variable time base, 4-20mA process control or V~(ac/dc) input contactor versions are available. DIN-A-MITE® Style B DIN rail and back panel mounting are standard on every control. Capabilities include single-phase and three-phase zero cross switching up to 40 and 22 amps, respectively, at 600V~(ac) (see rating curve). Variable time base, 4-20mA process control or V~(ac/dc) input contactor versions are available. A shorted SCR alarm option is also available. DIN-A-MITE® Style C DIN rail and standard panel mounting plus a cabinet thru-wall mount version is available. Basic features include single-phase, three-phase/two leg, and three-phase/three leg, 24-600V~(ac) operation. Current switching capabilities range from 30 to 80A depending on the model ordered. Variable time base, linear voltage and current process control or V~(ac/dc) input contactor versions are available. Also single phase, phase angle firing and current limiting are available. Watlow DIN-A-MITE® Style D The standard back panel mounting footprint is equal to that of an industry standard mercury displacement relay. The DIN-A-MITE Style D is capable of zero cross switching up to 100 amps single phase, at 600V~(ac) at 30°C (86°F), depending on the model selected. Gang together the input of two or three controllers and you can control three phase. It is totally touch-safe and includes standard back panel mounting, on-board semiconductor fuses (accessible from the front) and a current transformer option for external load current monitoring. An optional "shorted SCR detector" feature is available on some models. Variable time base, 4-20mA process control, or V~(ac/dc) input contactor options are available. Watlow DIN-A-MITE Selection Guide |
Zero Firing and Phase Angle Firing
How the solid state AC switch controls any given load depends on how and when the SCR gates are triggered. The firing “pulse” to the SCR gate is generated by a trigger circuit which in turn is usually controlled by a manual potentiometer, instrument controller, milliamp signal or ON/OFF control voltage. For proportional control of resistance heating loads, there are two types of SCR firing methods available:
Zero Firing
Zero firing is a method of proportional voltage control in which the SCRs are fired only when the voltage wave form crosses the zero voltage level at half cycles. Zero fired power controls are useful when radio frequency interference (RFI) and line voltage distortions characteristic of phase angle power controls must be avoided.
Within a given time base, the trigger circuit will energize the SCR gate for a certain number of cycles and then the trigger circuit will withdraw the pulse from the gate for a number of cycles. Power is regulated to the load by the ratio of the number of cycles ”ON” to the number of cycles “OFF” over the given time period (tbase).
Zero Firing
Zero firing is a method of proportional voltage control in which the SCRs are fired only when the voltage wave form crosses the zero voltage level at half cycles. Zero fired power controls are useful when radio frequency interference (RFI) and line voltage distortions characteristic of phase angle power controls must be avoided.
Within a given time base, the trigger circuit will energize the SCR gate for a certain number of cycles and then the trigger circuit will withdraw the pulse from the gate for a number of cycles. Power is regulated to the load by the ratio of the number of cycles ”ON” to the number of cycles “OFF” over the given time period (tbase).
Phase Angle Firing
Phase angle fired controls vary the voltage to the load by controlling the point of conduction within each ½ sine wave, by applying a timed trigger pulse to the SCRs-hence the name phase angle controlled. Therefore this method provides infinitely variable AC voltage control.
The result is that only a part of each cycle is “ON” and the remaining part of the cycle is “OFF” providing proportional RMS voltage control. This method provides a finer resolution of AC power control, but can generate RFI and line voltage distortions.
Phase angle fired controls vary the voltage to the load by controlling the point of conduction within each ½ sine wave, by applying a timed trigger pulse to the SCRs-hence the name phase angle controlled. Therefore this method provides infinitely variable AC voltage control.
The result is that only a part of each cycle is “ON” and the remaining part of the cycle is “OFF” providing proportional RMS voltage control. This method provides a finer resolution of AC power control, but can generate RFI and line voltage distortions.
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