KMB NOVAR-1 Series, Operating Manual

Page: 44 / 77

Novar 1xxx KMB systems
44
At the default setting shown above, the quantities Acos, APac, and APre contain the values of average
power factor, average active power, and average reactive power, respectively, for the last 7 days.
Analogously the quantities mincos, maxPac, maxPre, and maxdPre contain the minimum values of 1-
minute moving averages if power factor, maximum value of 1-minute moving averages of active
power, maximum value of 1-minute moving averages of reactive power, and maximum value of 1-
minute moving averages of difference between actual and required reactive power, respectively, since
last reset.
Moving window size can be selected of
1 11 1
–
15 15 15 15
–
1H 1H 1H 1H
–
8H 8H 8H 8H
–
1d 1d 1d 1d
–
7d 7d 7d 7d
, that is 1 minute – 15 minutes
– 1 hour – 8 hours – 1 day – 7 days. On changing the evaluation moving window size, the relevant
average and extreme values are automatically cleared and the evaluation restarted.
4.1.28 Parameter 58 – Temperature Display °C / °F
This parameter specifies if the temperatures measured are displayed in degrees Celsius or
Fahrenheit.
The measurement quantities of instantaneous temperature (Temp), maximum temperature
(maxTemp) and parameters overheating alarm limit (parameter 37), heating switching threshold
(parameter 59), and cooling switching threshold (parameter 60) are all displayed using the unit
specified and indicated with symbols
O
OO
O
C
CC
C
or
O
OO
O
F
FF
F
.
4.1.29 Parameters 59, 60 – Cooling and Heating Switching Thresholds
Of an output is set up to switching cooling or heating in parameter 26, you can specify the switching
temperature threshold required in parameter 59 or 60. The switching temperature hysteresis is about
5°C. The ranges and default thresholds are shown in Table 4.1.
If none of the output is set up to switching cooling or heating, the corresponding threshold is not used
or displayed.
4.1.30 Parameter 63 – Offset Control
In some cases it may be necessary to control "shifted" by a certain value of reactive power. A typical
example is an installation of a power transformer compensating capacitor permanently connected to
the transformer before the controller CT, or an installation of long power cable with not-negligible
parasitic capacity. In such cases, so called
offset control can be used.
As default, the parameter 63 is set to 0 (
OF=0
OF=0 OF=0
OF=0
). In this setting, the offset control is turned off and
the controller maintains the target power factor value, set in par. 01 (or 07).
If you set it to 1 (
OF=I OF=I OF=I OF=I
) , the offset control is activated with following consequences:
•
flashing decimal point of target power factor value ( par. 01 and 07 ) indicates that the offset
control is active
•
you can scroll to parameters 05 and 11, which can be set to the nominal offset (three phase)
reactive power value for metering rate 1 (parameter 05), respectively for metering rate 2
(parameter 11)
•
after the power factor control deviation ( i.e. reactive power difference to achieve target power
factor) is evaluated, the controller adds to it the offset power value, preset in the parameter
05, respectively 1. Therefore it controls to this “shifted” reactive power.