CHINT JKF8 Series User Instructions page 7

JKF8 SeriesSmart Low-Voltage Reactive Power Compensation Controller
is connected to phase C.
⑥ FU1~3— External fuse provided by user itself. The rated current of fuse core FU1 is 5A, the rated
current of fuse core FU2 and FU3 is 1A.
3.3 Operating Principles, Parameter Setup and Application Requirements
3.3.1 Operating principles
The controller displays "CAL" when it is powered-on, then it will enter auto operating status after
5 seconds. If the input current meets minimum requirement (bigger than 150ｍA), the controller will
display measured grid power factor COSΦ. In full automatic setup mode, the controller will initiate a
"self-learning process". During this process, the controller will compare the given "power factor value"
with the current power distribution system and add capacitors automatically to improve power factor.
In the meantime, the controller will record the values of the connected capacitor banks and use the
smallest capacitor bank as the reactive adding threshold.
No matter in automatic or manual parameter setup mode, the controller will compare the measured
inductive reactive power demand with F-1 reactive power threshold Qs. If the inductive reactive power
demand is larger than adding threshold, the lagging indicator will start flashing. After delay, add
capacitors level by level until the grid reactive power demand is lower than reactive power threshold Qs
and the power factor is not bigger than target power factor; when the power factor of the grid exceeds
target power factor, the leading indicator will start flashing, the system will automatically remove
capacitor banks in operation level by level (in 5 seconds).
3.3.2 Parameter setup
3.3.2.1 See Table 3 for parameter setup (menu introductions)
Code Name
Threshold setup mode
F-0
Adding threshold
F-1
Target power factor
F-2
Switching delay
F-3
Over voltage
F-4
Number of control
F-5
circuits
Current sampling
F-6
tranformer ratio
Note: When "F-0" is set to "1" (full automatic), "F-1" is set automatically, other parameters can be set manually.
3.3.2.2 See Table 4 for parameter setup and operation instructions
Full automatic
setup mode
Manual setup
mode
Table 3 Parameter setup
Setup range
1 or 0
1~120 kvar
0.85~-0.95
5~120 seconds
400V~456V
1~6 or 1~12
5~1200
Table 4 Parameter setup and operation instructions
In this mode, there is no need for further setup except correct wiring. User just need to setup
F-6 correctly, the system will display true values of total current, reactive power and active
power under full automatic setup mode (F-0 SET 1).
This mode enables professionals to conduct setup according to system conditions. In manual
setup mode, user must set the current transformer ratio correctly when starting the machine
for the first time. For example: if the sampling current transformer ratio is 1000/5A, the
controller ratio should be 200.(F-6 SET 200)
Factor y settings Increment
1
10 kvar
1.00
30 seconds
430V
6 or 12
60
05
Remarks
1 for full automatic setup,
—
0 for manual setup
Does not display F-1 under
1
full automatic mode
Minus means capactive system
0.01
1
Backflash voltage 8~10V
2
Two specifications
1
(300 : 5)
5