20
computer MAX
Instruction Manual
6�1�2�- COS
φ
TARGET
To set-up this parameter, use the keys
until the cursor points to the option
, then
push
.
The parameter allows the setting of the desired PF in the installation. The regulator will control
the connection of the necessary number of capacitors to get the maximum approach to the
target value. Since the regulation is in a stepwise mode, the regulator will add a new step when
the demanded power is at least 70% of the lower available step power and will remove a step
when the excess is also a 70% of the lower available step power. The cosφ adjustment range
is from 0,85 inductive to 0,95 capacitive.
6�1�3�- SMALLER AVAILABLE CAPACITOR STEP
To set-up this parameter, use the keys
until the cursor points to the option
, then
push
.
This parameter, named C/K, indicates the reactive current supplied by the smaller capacitor
step, measured at the secondary side of the current transformer (CT). Therefore, the setting
value depends on the power of the smaller capacitor step, on the CT ratio and on the supply
voltage.
Table 10
gives the setting values of C/K for a 400 V phase to phase supply for different CT ratios
and different values of smaller capacitor step (kvar). For conditions other than those given in
table, the paragraph “
6.1.4.- C/K PARAMETER CALCULATION”
shows a simple calculation to
obtain the C/K value
Table 10: C/K factor according to smaller capacitor power and CT ratio�
CT radio
(Ip/Is)
Smaller capacitor power in kvar, at 400 V
(1)
2�5
5�00 7�5 10�0 12�5 15�0 20�0 25�0
30�0
37�5 40�0 50�0 60�0 75�0 80�0
150/5
0.12
0.24 0.36 0.48
0.60 0.72 0.96
200/5
0.09 0.18 0.27
0.36 0.45 0.54
0.72
0.90
250/5
0.07
0.14
0.22 0.29
0.36 0.43
0.58
0.72
0.87
300/5
0.06 0.12 0.18
0.24 0.30 0.36 0.48
0.60
0.72 0.90 0.96
400/5
0.05 0.09
0.14
0.18
0.23
0.27
0.36
0.45
0.54
0.68 0.72 0.90
500/5
0.07 0.11
0.14
0.18 0.22 0.29
0.36
0.43 0.54
0.58 0.72 0.87
600/5
0.06 0.09 0.12 0.15 0.18
0.24
0.30
0.36 0.45 0.48
0.60 0.72 0.90 0.96
800/5
0.07 0.09 0.11
0.14
0.18
0.23
0.27
0.34 0.36 0.45 0.54
0.68 0.72
1000/5
0.05 0.07 0.09 0.11
0.14
0.18
0.22 0.27 0.29
0.36 0.43 0.54
0.58
1500/5
0.05 0.06 0.07 0.10
0.12
0.14
0.18 0.19
0.24
0.29
0.36 0.38
2000/5
0.05 0.07
0.09
0.11
0.14 0.14
0.18 0.22 0.27 0.29
2500/5
0.06
0.07
0.09 0.11 0.12
0.14
0.17 0.22
0.23
3000/5
0.05
0.06
0.07 0.09 0.10 0.12
0.14
0.18 0.19
4000/5
0.05 0.07 0.07 0.09 0.11
0.14 0.14
(1)
For supply voltages other than 400 V the C/K factor obtained from the table must be multiplied by the ratio
(400 / Vsupply)
Содержание computer MAX 12
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