Home | Products | Profile | Instructions | Enquiry

APFC Relays, Panel Meters, Power Factor Meters, Capacitor Sentinel, Microprocessor Based Power Monitor

OPERATING INSTRUCTIONS

1.	The 'Auto/Man' switch on the panel must be in 'Auto' position.
2.	Position of "TEST" push button must be outward.
3.	Set the cos Ø setting to the value calculated from the following formula.
4.	Set % KVAR setting to the value calculated from the following formula % KVAR = 60 X (KVAR per capacitor stage ) / x V x I (model PFR 941) % KVAR = 100 (minimum / first stage KVAR / x V x I (model PFR 942) Where, V = rated capacitor voltage in KV (0.415 KV etc.) I = rated primary current of main incomer CT in Amps. Note - All capacitor stages should be of equal KVAR rating in Model PFR 941
5.	P.F. meter indicates the system p.f. system (-ve sign for inductive p.f.)
6.	If the '-' (red) L.E.D. glows and persists, system requires capacitive load. The "switch on " cycle of the capacitor bank stages commences and after some delay, stage L.E.D.s and capacitors start switching on sequentially. As the capacitor banks are switched on, the system p.f. starts improving from initial low p.f. to 1.0 p.f.
7.	If the '+' (amber) L.E.D. glows and persists, systems has more capacitive load than required. The " switch off " cycle of the capacitor bank stage commences and after some delay, stage L.E.D.s and capacitors start switching off sequentially.
8.	Glowing of green L.E.D. indicates that the system p.f. and KVAR compensation are within set limits. No switching on or off can then take place.
9.	If 'O/V' L.E.D. glows and persists. it indicates that the system voltage has crossed safe value. The Controller trips all the stages and remains unaffected till supply voltage attains normal value.
TEST MODE OF OPERATION To avoid unnecessary switching of capacitors in this mode. keep 'Auto/Man' switch on the panel in 'Man' position. When the push-button on the front panel marked "'TEST" is depressed inwards. the TEST mode is activated and input current signal connected at M & L terminals is internally disconnected. As such the PFCR cannot sense system P.F., and simulated current signal having typical power factor of 0.89 is internally injected, which is indicated in the digital p.f. display window. User can then have calibration check of the Controller as under

   COS Ø Setting
   Adjust % KVAR setting=o
   if COS Ø setting >0.89 the red LED marked (-) glows.
   if COS Ø setting <0.89 the amber LED marked (+) glows.

% KVAR Setting
Adjust COS Ø setting = 1.0
If % KVAR setting > 15% the green LED marked glows.
If % KVAR setting < 15% the red LED marked (-) glows.
Adjust COS Ø setting = 0.8
If % KVAR > 7% the green LED masked glows
If % KVAR < 7% the amber LED marked (+) glows.
Note : Above values correspond to rated supply voltage.

Switching Stages
Adjust COS Ø and % KVAR settings as mentioned in operating instructions so that the red L.E.D. marked (-)
glows and stage indicating L.E.D.s and corresponding o/p contacts switch on in a sequence. Adjust COS Ø
and % KVAR settings as mentioned in operating instructions so that amber L.E.D. marked (+) glows and stage
indicating L.E.D.s, and corresponding o/p contacts switch off in a sequence.

IMPORTANT
   * P.F./ KVAR Controller Mode PFR 941 is designed for optimum operation when all the capacitor bank
     stages are of equal KVAR rating.
   * P.F. / KVAR Controller Model PFR 942 is best suited for capacitor bank stages with unequal KVAR rating