LOVATO ELECTRIC DCRG8 Manual Operativo página 9

Example 2 (Application in series):
A system with 18 steps of 40kvar each is divided into three identical panels, each with 6 steps, 240kvar in total. For each slave panel, the 8 relay outputs of the
controller are used as follows: the first six for the steps (OUT1...6), the seventh for the cooling fan (OUT7) and the last for the alarm (OUT8). On the master
panel, there will be 18 logic 40kvar steps. The steps from 1 to 6 will be "mapped" on the outputs OUT1...6 of the master, those from
7 to 12 on the outputs OUT1...6 of slave 1 and finally the steps from 13 to 18 on the outputs OUT1...6 of slave 2. In this case, parameter P02.07 Smallest step
power will have to be set (on the master) at 40kvar.
Programming of the master:
PARAMETER VALUE
P02.07 40
P03.01.01...P03.18.01 1
P04.01.01...P04.06.01 Step 1...6
P04.07101 Fan
P04.08.01 All glb 1
P05.01 COM1
P05.02 Master
P05.03...P05.04 ON
P06.01.01...P06.06.01 Step 7...12
P06.07.01 Fan
P06.08.01 Glb al 1
P07.01.01...P07.06.01 Step 13...18
P07.07.01 Fan
P07.08.01 Glb al 1
Programming of slave 1:
P05.02 Slave1
Programming of slave 2:
P05.02 Slave2
– The communication between master and slaves is via an isolated RS485 communication module type EXP1012 for each device; the maximum distance can
be 1000m.
– All programming is done on the master controller: setting the type of system, the CT, the logic steps and step pairing between logic and physical outputs of
the master and the slave. The program is then automatically extended to the slaves.
– On the slaves, it is necessary to only set the slave role (with parameter P05.02).
– All parameters relating to this function are grouped in menu M05.
– If the communication between master and slave is cut off, the fault is signalled by an alarm and all slave outputs are disconnected.
– To be sensitive to no-voltage release, the slaves must be connected to the line voltage while it is not necessary to connect the current measuring inputs.
– Each slave displays the main power factor correction data sent by the master, with the state of the 32 logic steps of the entire system (in the usual window at
the top right) and the states of its local outputs in a window at the bottom.
– If there is an alarm in the system that involves all the steps (e.g. lack of current signal, overvoltage, no-voltage release, etc.), all the logic steps are then
disconnected that is all the outputs of both the master and the slaves.
– If instead, an alarm occurs that affects only one of the panels (either a master or slave), such as temperature or harmonics protection, then only outputs that
control the steps involved in the panel in alarm are de-energised, while the rest of the system continues to work, even if with a limited efficiency.
– Each alarm has a specific property, called Slave disconnection; it indicates if the alarm has implications for the entire system (property set to General) or only
on the panel concerned (Local). See the alarms table.
DESCRIPTION
40 kvar
All the 18 logic steps are 40kvar
Outputs OUT1...OUT6 of the master are activated by logic steps 1...6
OUT7 of the master controls cooling fan
OUT8 of the master controls global alarm 1
Communication port used for the link
Role of master
Enables slave 1 and slave 2
Outputs OUT1...OUT6 of slave 1 are activated by logic steps 7...12
OUT7 of slave 1 controls cooling fan
OUT8 of slave 1 controls global alarm 1
Outputs OUT1...OUT6 of slave 2 are activated by logic steps 13...18
OUT7 of slave 2 controls cooling fan
OUT8 of slave 2 controls global alarm 1
Role as slave1
Role as slave2
G
B
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