Digital SSR Power Regulator with Built-in SSR

This digital solid state power regulator (DSPR2) has a built-in zero-crossing solid state relay (SSR) that can handle up to 3 Amp of load. It provides linear output for power adjustment. It can be used for a small heater, small AC fan, pump or motor***. User can adjust the output power from 0% to 100% by turning the digital rotary encoder with 1% resolution. Using the rotary encoder to change the numeric value is much easier than using the key pad, as in many PID controllers on the market. In contrast to our SSVR, this unit is able to regulate the power linearly, with high precision, good reproducibility, and low electromagnetic interference (EMI).

This regulator offers two firing modes: burst firing (default mode) and time proportional firing. The burst firing mode is preferred for resistive loads, which can provide a uniform power output to the heater and can extend the life time of the heater. The firing signal is a series of short pulses distributed over one hundred AC line cycles. The duration of each pulse equals to one AC line cycle (16.67 milliseconds for 60Hz or 20 milliseconds for 50 Hz, automatically detected by the regulator). The time proportional firing mode can be used for a SSR that is controlling a device that is not conducive to high frequency of switching, such as electromechanical relays and mercury displacement relays. 

Specification
Power input: 90-260VAC, 50 Hz or 60 Hz.
Control resolution: 1%.
Control mode: burst firing mode* (default), time proportional mode**. (See Note below)
Output mode: Built-in 3A SSR with zero crossing switching 20-240VAC

Dimension
Overall: 1.89 x 1.89 x 3.94" (48 x 48 x 100 mm), 1/16 DIN.
Mounting cut out: 1.77 x 1.77" (45 x 45 mm)
Length: 86 mm (from the front panel to the back); 100 mm if include the rotary knob. 

Note:
* The burst rate will between 1 and 100 pulses for each 100 AC cycles. The pulse width equals to one AC cycle. It is automatically adjusted for 50 or 60 Hz.
** Cycle time: 1-99 seconds.
*** For motor, the minimum power has to meet the requirement to overcome the friction and torqure requirement for it to rotate.
 
Click here for instruction manual.