Servo Voltage Stabilizer

‘RED PHASE’ series of Servo voltage stabilizers offer a reliable and tested economic solution to inconveniences caused by voltage fluctuation. To use ‘RED PHASE’ SCVR is a real investment because the elimination of the inconveniences means a reduction in costs and an increase in productivity. Very often it is only necessary to avoid a few minutes machine downtime or just one failure to repay the cost of the stabilizers. ‘RED PHASE’ SCVRs are particularly suitable for applications that require:

Silent Feature

High reliability

Capability to compensate wide mains voltage variations

High precision of stabilized voltage

Stabilizing of high power services

Simple and limited maintenance


‘RED PHASE’ SVS regulate through a series transformer. A micro based control circuit drives the variable autotransformer that supplies the required voltage to the series transformer either in phase or phase opposition to bring the mains to the rated value.

Unbalanced Load models that, having three separate control circuits, individually regulate each phase and are therefore suitable for unbalanced lines and load unbalance between phases up to 100% phase opposition to bring the mains to the value.

Difference between Analog and Digital Servo Stabilizer (Download – Tech Pavilion PTR 007)

Sr. No Digital SCVS Analog SCVS Digital Feature Advantage
1 Microchip controller as heart of control board, 20X4 LCD for runtime electrical parameter display and metering Separate Analog / Digital meter needs for metering Higher reliability and performance, easy for user to monitor all parameters and fault details to take preventive actions
2 Front panel control for parameter setting Factory set, can’t change Easy to change output parameter as per customer need
3 Intelligent enough to control overload based on system KVA rating Factory set only System will not be allowed more than system power rating other than set overload setting. System and load can be saved from hazard
4 Output voltage upper and lower cutoff based on output set value Factory set only Load will be always safe from the output over voltage  in case of  change in set output voltage, controller itself will take min/max threshold value
5 Individual message for each fault Common indication for any fault Easy for user to recognize unhealthy status of servo or load. User can take preventive action based on this indication
6 Single board for control and conditioning Separate board for control and conditioning Less component count and board to reduce failure probability
7 On board buzzer External buzzer with complex hardware logic User will get buzzer for all kinds of faults to recognize system status without visualizing
8 Buzzer control from front panel No control User can control the buzzer as per their need
9 Easy for wiring and maintenance Complex than Digital control Reduced wiring will increase reliability in the system, lesser probability of failure or malfunction
10 Fault history storage capability for all faults, can store No. of faults occurred during operation No history This is great feature of Digital controller, user will always be aware with load performance input line conditioning. User himself can take preventive actions. This will reduce time to repair system.
11 Can store absolute maximum voltage and current parameters to take preventive action No such record This will provide correct information of how much maximum voltage and load current can be sustained by the system. From this preventive action can be taken for the load
12 SCVS ON / OFF control through Front panel soft key for maintenance Separate hardware for manual operation User can start and stop output without switch on and off input supply, can do maintenance from line side
13 Independent output control through single board, no separate card required for cutoff, phase sequence error Three different control and cutoff card required to achieve this requirement Less component count and board to reduce failure probability
14 RS232 / 485 serial communication with auto baud rate feature for remote configuration as well as monitoring. Can make SCVS on and off as well as can get all system status and history from remote place No such PC communication User can check status of the servo from the PC itself and need not go to servo and check the parameters. With RS485 more than one system parameters can be checked in PC. User can start and stop servo from the PC itself. This will generate system status and fault history report to understand line and load voltage behavior
15 System in manual mode alarm message in case the system is bypassed through digital control No This feature will help user to remind system is in manual mode, by mistake if user forgets to change from manual to auto mode system will not regulate respected line output and can damage load
16 Carbon loss indication for easy preventive action and maintenance No User will come to know that carbon brush has damaged (this will lead system output to be very high voltage) and can ask for early preventive action, load will be safe in case of carbon failure.
17 Can set SCVS Sr. No. and commission date information for easy maintenance No User can check system history  like Sr. No.,  installation date and ask for preventive maintenance

Unique Features
RED PHASE has developed state of art DSPIC based controller to stabilize utility voltage. Apart from its standard feature it has following unique features to improve reliability, serviceability and reduce system down time.
• Variac protection

• Utility voltage levels are very dynamic and change over time is unpredictable. Higher voltage can generate catastrophic failure in SCVR (mainly Variac) which impacts on higher down time . This feature isolates the VARIAC whenever voltage goes high at cutoff limit and restores the same once utility voltage comes back to normal range.
• Carbon brush failure protection
Carbon brush failure is frequent phenomena due to wear and tear. This failure results in higher down time or uncontrolled voltage to machines. RED PHASE has developed algorithm to detect carbon brush loss. This feature helps user to take preventive action to reduce down time and MTTR.