Revision 1 – 04.12.2015 26/28
MASTER/SLAVE OPERATION
The two compressors must be connected through serial connection RS232 BASE (crossing RX and TX) with length cable no
longer than 10 m (for longer distance use interface RS 232/485).
Set C07 as 1 (2 in case of protocol Master/Slave new allowing to connect two inverter machines). In the same menu set the
time to switch Master into Slave (parameter C07.1) and the timer Slave comes into force in case Master is not enough at
the first staring (parameter C07.2).
Pushing on one of the 2 compressors to put into operation both units.
During power up you have to wait for 5 seconds before the connection between the two compressors start.
Pushing on one of the 2 compressors to switch OFF both units.
In case IN4 opens on one of the two compressors, it stops both machines.
In case one of the parameters WP2÷WP5 is changed on one of the two compressors, all these parameters are copied on the
other compressor.
Parameters are: date and time, Restart (automatic or manual), weekly timer and DLS/Summer time.
The Slave compressor starts only if:
1. during the first starting by button or timer, Master has not reached the stop pressure until the setting time;
2. the pressure decrease below set on WP5.
The change Master into Slave comes:
1. when the Timer Master/Slave is over (working hours);
2. in case of Master shut-off;
3. in case one of the 2 compressors has more working hours than the time set on le the parameter Timer
Master/Slave (working hours), the second compressor keep on working till to reach the same working hours of the
other + the hours set on Timer Master/Slave.
Only after this time the Master will change into Slave and the Slave into Master.
NOTE:
in case of maintenance on one of the two compressors, before to stop it you have to set both units as stand alone working;
after maintenance only you can restore the Master/Slave operation.
In case of serial connection failure, both compressors will be Master.
MASTER/SLAVE INVERTER (ONLY FOR LOGIK26S, LOGIK33S)
In case the controller connected to Master/Slave are Logik26S or Logik26S + Logik33S it is possible to set the parameter
master/slave (C07 on Logik26S) as 2 on both unit.
In this case the system take into consideration that both machines have a variable air flow.
In case of different nominal air flows one compressor becomes master if:
a) both units are loading and the total air flow is higher than the flow of the actual master machine but lower than the slave
flow (condition valid for 60 seconds), after next 60 seconds the compressor become slave switch to unload running if this
conditions keeps on going;
b) the average flow in the last 10 minutes is lower than half of the flow of the actual master but lower than the flow slave
and higher than half of the slave (it means the new master has a better flow while an oversize compressor is running in
relation to the air demand).
Besides it is possible to set the parameter C07.4, Inverter Twin, so that both compressors modulate the speed according
the pressure. On different case the master unit works 100% and slave modulate.
MULTIUNIT OPERATION
Connect the compressor to the net RS485 with other machines and master unit (one controller for compressor Logik3xS oor
one controller for compressors room management Logik200) .
You have to set:
1. The parameter C07=3
2. Compressor MODBUS addrress C08: value different from 1 reserved to the Master Multiunit
3. Compressor air flow
Pushing on one of the Multiunit compressors, all the units are ON.
Pushing on one of the Multiunit compressors, all the compressors are OFF.
For the Multiunit operation, see related document.
In case of maintenance on the compressor, you can set parameter C07.3=YES to shift to manual operation (start/stop).
Master is automatically informed and consider this compressor out of order.
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