Reactive Power Controllers
Reactive power controllers MCS and MCX series are designed to measure the reactive power of an installation and to give the necessary instruction for connecting and disconnecting capacitors in order to maintain the desired cos φ.
All the controllers are commanded by a microprocessor that ensures an uniform ageing of contractors and capacitors by using a circular connection sequence that takes into account the time that each capacitor has been switched on.
Power factor value to be reached can be adjusted in a continuous way, between 0.85 inductive and 0.95 capacitive.
Standard working programs for controllers are 1:1:1:1:.1:2:2:2:,1:2:4:4:,1:2:4:8:,and 1:1:2:2:.
MCX controllers included fully operational alarm relay that acts when the automatic capacitor bank can not reach the required cosφ . This relay can be used to trip an alarm (acoustic, lighting ,etc.) that permits to find and solve the cause of the problem (blown fuses, wrong settings in the controllers, necessity of increasing the power of the automatic capacitor bank, etc.) ,before falling into additional charges for reactive power consumption.
In MCR controllers, this alarm relay is only available when using 1 to 5 output relays on a MCR-6N, or 1 to 11 output relays on a MCR-12 controller.
MCX controllers also include a harmonic distortion alarm relay and LED indicators showing permanently capacitors steps that are connected.
Advantages
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• Uniform ageing of the capacitors and contractors.
• High speed operation with less number of switchings.
• True rms measuring circuit, insensitive to harmonics.
• Automatic disconnection of all the capacitors in the case of a failure in the electrical power supply.
• Detection and automatic indication of current transformer wrongly connected.
• Digital cosφ display.
• Adjustable operation delay.
• Power factor alarm relay (MCX Series).
• Harmonic distortion alarm relay (MCX Series).
• Possibility of more compact size:96 × 96 mm (MCX Series). |  |
Installation
The figure shows mounting dimensions of the controllers.
For operation, controllers only need the installation of a …/ 5 A current transformer in the main supply line.
Controllers are supplied with full technical information that makes easier their assembling and connection.
Service
The technical assistance service is at your disposal to cooperate in t he project and installation of capacitors, power factor correction equipments and harmonic filters.
Other Controllers
International Capacitors other LIFASA controllers for especial applications:
--MCX -8F with very fast connection times especially designed for capacitors banks with static contactors.
--MCX-4R DIN rail mounting for small capacitors banks.
Technical Characteristics
Series |
MCS-6 |
MCX-8 |
MCX-14 |
Dual voltage |
230V -10/+15%
400V -10/+15% |
230V -10/+15%
400V -10/+15% |
230V -10/+15%
400V -10/+15% |
Frequency |
50 a nd 60 Hz |
50 a nd 60 Hz |
50 a nd 60 Hz |
Phases |
3 phases |
Single or 3 phases |
Single or 3 phases |
Power consumption |
5 VA |
5 VA |
5 VA |
Current circuit(isolated)
Power consumption |
0.5 VA |
0.5 VA |
0.5 VA |
Current transformer(external) |
…/ 5 A |
…/ 5 A |
…/ 5 A |
Working programs |
1:1:1:1:
1:2:2:2:
1:2:4:4:
1:2:4:8:
1:1:2:2: |
1:1:1:1:
1:2:2:2:
1:2:4:4:
1:2:4:8:
1:1:2:2: |
1:1:1:1:
1:2:2:2:
1:2:4:4:
1:2:4:8:
1:1:2:2: |
Four quadrants operation |
On request |
Yes |
Yes |
Reading of cosφ |
2 digits LED display |
3 digits LED display |
3 digits LED display |
Line current measurement |
No |
Yes |
Yes |
Harmonic distortion measurement |
No |
Yes |
Yes |
LED step indication |
No |
Yes |
Yes |
Continuously adjustment of cosφ |
0.85 IND-0.95 CAP |
0.85 IND-0.95 CAP |
0.85 IND-0.95 CAP |
Range of C/K |
0.05 a 1 A |
0.05 a 1 A |
0.05 a 1 A |
Automatic calculation of C/K |
No |
Yes |
yes |
Connection delay between the steps of the program |
Adjustable by keyboard 10s ( 4/10/30 /60s) |
Adjustable by keyboard 10s( 4 a 999 s) |
Adjustable by keyboard 10s( 4 a 999 s) |
Time between reconnection the steps of the capacitors |
Adjustable by keyboard 50s(20/50/150/300 s) |
Adjustable by keyboard 50s(20 to 999 s) |
Adjustable by internal jumper 50s(20 to 999 s) |
Power factor alarm relay |
No |
Yes |
Yes |
Harmonic distortion alarm relay |
No |
Yes |
Yes |
Working temperature |
-10/ + 50 ℃ |
-10/ + 50 ℃ |
-10/ + 50 ℃ |
Wiring |
Connection terminal |
Plug-in connector |
Plug-in connector |
Degree of protection |
IP 41 |
IP 41 |
IP 41 |
Dimensions of the controller(DIN 43700) |
144 × 144 mm |
144 × 144 mm or
96 × 96 mm |
144 × 144 mm |
Dimensions of the mounting hole |
138 × 138 mm |
138 × 138 mm or
92 × 92 mm |
138 × 138 mm |
Total controller depth |
50 mm |
73 mm |
73 mm |
Approximate weight |
0.61 kg |
1.1 kg or 0.9kg |
1.35 kg |
Admissible load of output relays |
4 A / 240 V AC
1 A / 110 V DC |
4 A / 240 V AC
1 A / 110 V DC |
4 A / 240 V AC
1 A / 110 V DC |
Number of output relay |
MCX-6/3 3 relays
MCX-6/4 4 relays
MCX-6/5 5 relays
MCX-6/6 6 relays |
MCX-8/3 3 relays
MCX-8/4 4 relays
MCX-8/5 5 relays
MCX-8/6 6 relays
MCX-8/7 7 relays
MCX-8/8 8 relays |
MCX-14/10 10 relays
MCX-14/12 12 relays
MCX-14/14 14 relays |
*Other voltages and frequencies on request.
