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In broadcast communications, only the representative inverter in each block returns data to the host
computer. However, you can make the representative inverter in each block report the occurrence of
a problem in the block. To do so, follow these steps.
Set the timer function so that, if a time-out occurs, the inverter will trip (Ex.: = (sec)), set the
output terminal selection parameter (FL) so that trip information will be output through the output
terminal (=), and set the input terminal selection parameter (F) of the representative in-
verter in each block to “external input trip (emergency stop)” (=). Then, connect the input
terminal (F) of the representative inverter to the FL terminal of each of the other inverters in the same
block. In this setting, if an inverter trips, the representative inverter will come to an emergency stop,
and as a result it will report the occurrence of a problem in its block to the computer. (If the repre-
sentative inverter returns a lowercase letter in response to a command from the computer, the com-
puter will judge that a problem has arisen in an inverter.) To examine details on the problem that has
arisen, the host computer accesses each individual inverter, specifying its communication number.
To make the computer issue a command to all inverters in block 1 or block 2 shown in the figure
above, specify “1*” or “2*”, respectively. In this system, inverter No. 10 will return data to the comput-
er if a problem arises in block 1, or inverter No. 20 if a problem arises in block 2. For overall broad-
cast communications, specify “**”, in which case the inverter with the communication number “00” will
return data to the computer.
In this example, if you want the computer to maintain communications without bringing an represen-
tative inverter to an emergency stop, set its input terminal selection parameter to “disabled
(=) but not to “external input trip (emergency stop).” This setting causes the host computer
to check the setting of the input terminal information parameter (communication number: FE06) of
the representative inverter, and as a result enables the computer to detect the occurrence of a prob-
lem.
CAUTION:
Data from inverters will be deformed if inverters of the same number are connected on the network.
Never assign same single numbers to inverters on the network.
•
An example of system configuration (schematic diagram)
Host
computer
Inverter No. 10 Inverter No.11 Inverter No.19
Inverter No.20 Inverter No.21 Inverter No.29
*1: Error signal I/F
*1
Block 2
Block 1
VF-S11
VF-S11 VF-S11 VF-S11 VF-S11 VF-S11
A
RS485 communication converter unit (RS4001Z,
RS4002Z or RS4003Z) will be needed to control multiple
inverters on the network.