RM Series with Dual Setting Controller

Intelligent Reactive Power Management – RM Series Dual Setting Controller


  • Intelligent RM Series P.F. Controllers are used for measurement and control of P.F. control units for central reactive power compensation. The P.F. measured by Neptune RM Plus is compared with the set values and in order to provide necessary compensation. P.F. Controller switches capacitor banks ON & OFF automatically. RM Plus is Single Phase CT Sensing micro controller relay, designed for above application in 144×144 case for flush mounting with rear plug-in connectors. Microcontroller based programmable RM Plus series relays are manufactured with 8 & 12 capacitor steps. It can work either in automatic or manual mode.


  • Intelligent Switching for Balanced Load Compensation
  • Dual Target Cos Phi (For Mains & Generator PF Compensation)
  • Password Protection
  • Internal Temp. Control
  • Automatic Setup
  • Measures and displaying upto 19th harmonics for voltage & current
  • Programmable discharge time
  • Automatic calculation of power values for each capacitor step

Auto / Manual mode selection

  • 10 different programs
  • C+ / NORMAL / C- condition light
  • Automatic calculation on C/k value
  • Automatic calculation on C/k value
  • Optional temperature control with J type T/C input
  • Insufficient compensation alarm
  • Over compensation alarm

Programmable over voltage protection and alarm for capacitors

  • Automatic disconnection of all capacitor steps in case of Mains failure over 20 sec.
  • Programmable CT and PT ratio setting
  • Non-flammable enclosure

Mechanical Parameters

# Parameters
Equipment Protection Double Insulation, Measurement Category III
Ambient Op. Temperature -5 C, +55 C
Ambient Humidity 95%
Degree of Protection IP40 (Front Panel)
Connection / Installation Terminal / Flush-mounting with rear terminals
Dimensions 144×144 mm
Capacitor Loss < 0.5 watt/ KVAr
RM-8  and RM-12

Electrical Parameters

# Parameters
Operating Voltage (Un) 230V AC ±10%, 50/60Hz
Operating Current 100 mA – 5.5A
Capacitors Steps 8 / 12
Network Type Single Phase, 1 CT
Accuracy 1% ±1 digit (V, I, cos phi)
2% ±1 digit (W, Var, VA)
Current Transformer Ratio 5…10000/5A
Power Consumption < 2 VA (Current Circuit)
< 3 VA – 10 VA (Voltage Circuit)
Cos Phi Setting 0.8 < Cos phi
C/k Setting 0,02 – 1,00
Time Delay Between Steps 1-1.800 Sec. (for switch on / off separately) Discharge Time (Reconnection Time) – 1-1.800 Sec.
Over Voltage Setting 240-275V AC
Output Contact 3A, 750VA
Display Red LED, 14 mm Height (144x144mm)
Dual Target Cos Phi (For Mains & Generator) Yes
Automatic Energy Correction Yes
Automatic Disconnection of Damaged Cap. Steps Yes
Programmable THD-I and THD-V Alarm NO
Programmable Discharge Time Yes
Programmable Over Voltage Alarm Yes
Automatic Over Voltage Alarm Yes
Automatic Power Calculation Yes
Programmable Energy Ratio Alarm Yes
Password Protection for Setup Yes
RS-485 Communication NO
Alarm Contact Output (Over Voltage, Harmonics) Yes
Upto 19th Harmonics NO
Phase-Neutral Voltage (VLN) Yes
Phase-Phase Voltage (VLL) Yes
Phase Current (I)


Active Power (P) Yes
Reactive Power (Q) Yes
Apparent Power (S) Yes
RM-8 and RM-12