Novar NOVAR-1xxx NRC Operating Manual - page 12
Novar-NRC
KMB systems
12
In principle, one of two remote control modes can be activated - either the I/O or the RCC mode :
•
RCC mode
The RCC mode (Remote Controlled Cos
ϕ
) is designated for remote control of target power
factor value. Simultaneously, a remote controlled outputs can be driven by additional NRC86
units.
Basic RCC-mode, so called active, must be set at one of PFCs only connected to the NRC86
unit(s); this PFC then behaves as “master”, that means it controls data interchange on the
communication link; during this, actual states of the PFC outputs are transferred to additional
NRC86 units in case of simultaneous remote outputs control. If more PFCs connected to the
NRC86 unit, all of others must be set as „slaves“, that means to passive RCC-mode marked
as RCCP.
As soon as the mode is set, the master PFC starts to send commands to the NRC86 unit(s).
The unit (with address of 200 if more units connected) receives them, processes them and
sends confirmation back to the master PFC. The master PFC receives and processes the
NRC86 confirmation and this loop is repeated forever. The slave PFCs listen to
communication and receives the NRC86(s) answers (confirmations) only.
The (first) NRC86 confirmation contains so called remote controlled PF serial number
-
its
value can be checked parameter 81. According this value and remote controlled target PF
values preset in parameter 80 it evaluates actual target PF, displays it in parameter 01 and
controls the PF according its value.
If the first NRC86 unit respectively set and more units (up to six ) connected in “cascade”, the
response of the previous unit is always received by the next unit with address higher by one
and such units operate as remote controlled outputs as described below.
•
I/O mode
The I/O mode (Inputs/Outputs) is determined for remote controlled outputs only. In this
mode, up to seven NRC86 remote controllers can be connected to a single PFC.
The data interchange between the PFC and the NRC86(s) runs in the same way as in the
RCC mode with one difference only – target power factor is not controlled by the NRC86, but
actual state of the PFC outputs is transmitted to the NRC86 unit(s) and so the PFC state
outputs are “copied” to the unit outputs.
So called daisy-chain communication can be set at the NRC86 unit. If set , the unit passes
each command to the next unit with address higher by one after processing it. At the last unit
in the cascade the daisy-chain communication must be switched off.
Next, a number of processed outputs can be set at each unit. It specifies how many of PFC
outputs to be received and “copied” to the unit outputs. At the next unit in the cascade you
can set number of processed outputs similarly; then remaining PFC outputs are processed,
i.e. those starting from the first PFC output not processed by the previous unit. Maximum
number of the units in cascade is 7.
Example : The 1st unit setting : address=200, daisy-chain comm =on, No. of processed
outputs=6; the 2nd unit setting : address=201, daisy-chain comm =on, No. of processed
outputs=4; the 3rd unit setting : address=202, daisy-chain comm =off, No. of processed
outputs=7. Then, at the 1
st
unit 1÷6 outputs, the PFC 1÷6 outputs will appear; the 2
nd
unit
1÷4 outputs will copy the PFC ouputs No. 7÷10; and finally, at the outputs 1÷7 of the 3
rd
unit, the PFC outputs No.11 and higher will appear (up to 17, or to the PFC maximum
output).