INSTALLATION
The Controller rear panel has A,B,M,L input terminals for
external electrical signal input.
1) A & B terminals are to be connected to 2 phases of
a 3 phase electrical system.
M & L terminals are to be connected
to CT secondary
2) In case the CT secondary is connected to other
instruments in addition to the Controller.
a) current coils of other instruments
and controller terminal must be connected in series
b) rated burden of the CT must be
sufficiently large to accommodate the burdens imposed
by all the
instruments, terminal, cable etc. connected in the CT secondary
circuit.
3) The CT must be mounted on
a) the main incomer bus-bar carrying
sum total of load and capacitive currents.
b) the third phase of the system of
which other two phases are already connected to A & B
terminals of
the Controller.
4) The rated current of CT secondary and rated signal input
current of the Controller must be
identical i.e. 5 Amps or 1 Amps. (Check
the name plate of the controller for CT secondary
current required)
5) The Controller rear panel has K1, K2........ stage wise and KC
as a common normally open
potential free output contact terminal.
Hence separate supply to coils of the contractors used for
switching the capacitor banks must be
provided through these terminals. Contact configuration
with potential free separate contact
pairs for each stage K1N1, K2N2.......etc. can be
provided on request.
COMMISSIONING :
1) Confirm the set-up as per the installation instruction.
2) Check the fuse provided on the Controller rear panel.
3) Switch off all the capacitor bank in the entire circuit.
4) Confirm the CT secondary current with a multimeter by
connecting it in series with M & L
terminals of the Controller. It must be
at least 5% of its rated value, for proper functioning of
the Controller. (CT secondary can also
be checked with clip-on type ammeter)
5) Set COS
Ø = 1.0 and %KVAR
= 0
6) Switch
on the capacitor control panel and the controller.
a) if the "O/[V"
(red) L.E.D. glows and persists, check if the supply voltage os
higher than
the safe
value.
b) if the "'ERR"
(red) L.E.D. glows and persists, check and rectify external
wiring for (i) incorrect
phase sequence,
or (ii) incorrect CT polarity, or (iii) absence of input current
signal.
c) The "ERR" function in (b)
above is disenabled in presence of two simultaneous system
errors.
Counter-check
against this condition is indicated in (d) below.
d) As the load is inductive (see
3 above), the P.F. meter should indicate inductive (-ve) reading
within estimated
limit and the "-" (red) L.E.D. should glow and
persists. if not, verify again the
external wiring
connection as per (6b) above.
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.
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