KMB NOVAR-1 Series, Operating Manual

Page: 43 / 77

Novar 1xxx KMB systems
43
functions – do not use them). If a number of instruments are connected to the communication line,
each instrument must have a different address.
For Ethernet interface instruments, the address value is irrelevant (but communication rate and
protocol must be properly set). The instrument is addressed by so-called IP-address preset in built-in
communication converter ES01. Setup of the converter is explained in the
ES01 Embedded Ethernet
to Serial Link Converter application handbook available on www.kmbsystems.eu .
The communication rate (parameter 51) can be set to one of the values: 4800, 9600, 19200 Bd.
The standard communication program uses a proprietary communication protocol, “KMB”. The
protocol is set as default in parameter 52, as
P0 P0 P0 P0
. Data transfer without parity bit and with one stopbit
is used.
To facilitate implementation within user applications, the Modbus-RTU protocol can be used as well.
The protocol can be set as
P1N
P1N P1N
P1N
/
P1E
P1E P1E
P1E
/
P1O
P1O P1O
P1O
( non parity / even parity / odd parity ). Detailed
description of both protocols can be downloaded at www.kmbsystems.eu or requested from the
manufacturer.
The values specified will be kept even on controller’s initialization (see description further below).
4.1.26 Parameter 55 – Power System Frequency
In order to obtain correct evaluation of measurement values, connected voltage and current sampling
must be derived from the power system frequency. The controller measures the frequency on basis of
voltage signal zero crossover rate. Voltage and current sampling then takes place in accordance with
this parameter setting as follows:
F= A
F= A F= A
F= A
.... continuous sampling derived from frequency value measured (default setting)
F=50 F=50 F=50 F=50
.... fixed sampling for power system frequency 50 Hz
F=60 F=60 F=60 F=60
.... fixed sampling for power system frequency 60 Hz
Setting to
A A A A
is optimum in most situations. Sampling of signals under measurement is continuously
governed by measured frequency 10-second moving window average within the range from 43 to
67 Hz.
If the voltage signal is distorted to a degree when frequency can not be measured with sufficient
accuracy, you can set up the parameter to 50 or 60. The measurement signals are then sampled at
the fixed rate specified with no regard to the frequency measured.
4.1.27 Parameters 56, 57 – average, maximum, minimum value evaluation window size
Besides displaying instantaneous measurement quantities, the controller also evaluates and records
average and extreme (maximum/minimum) values. The evaluation window size for maximum of THD,
CHL, harmonic components, and temperatures is fixed (1 minute) while it can be specified in the
range from 1 minute to 7 days for the other quantities, as shown in Table 4.8.
Table 4.8: average and extreme power and power factor value evaluation window sizes
param. description default value
56 window size for evaluation of average power factor,
Acos, and average power, APac, APre. 7 days
57 window size for evaluation of minimum power factor,
mincos, and maximum power, maxPac, maxPre, and
maxdPre 15 minutes