*8. When the Co-inverter Communication Start Selection (H306) is set to “0: Start via 485 terminal,” set one of
the Input Terminal [DI1] Function Selection to Input Terminal [DI7] Function Selection (E01 to E05, E98,
E99) to “160: 485 (Start co-inverter communication).”
*9.
When the Co-inverter Communication Start Selection (Administrator) (H306) is set to “1: Constant communi-
cation,” the management inverter starts sending data as soon as the power supply is turned on. At this time,
if the next master inverter is delayed in the startup and cannot receive the master switching command, the
master inverter cannot send the data, which results in a communications timeout error on the management
inverter. When you set H306 to 1, check that the startup of other inverters is completed and power on the
management inverter finally.
*10. Although, in master-to-slave communications, you set recipient slave's station number, actually, data is sent
to all stations via broadcast communications (Station No. 0). Slaves that are not specified as the recipient on
the master side discard the received data.
8-8-2
Co-inverter Communication Settings
• On each inverter, set the station number (y11) so that they do not overlap among the inverters. Do
not forget to set the station No. 1, which serves as the management inverter
.
• On the management inverter
, set the Co-Inverter Communication Function Selection (H303) to “2:
Active EzCOM (administrator).” For other inverters, set the Co-Inverter Communication Function Se-
lection (H303) to “1: Active EzCOM” or “2: Active EzCOM (administrator).”
• Set a station number 1 to 8 on inverters that serve as the master inverter. To switch the master in-
verter among more than one inverter, the station numbering must be sequential. On the manage-
ment inverter, set the smallest master station number in the Co-inverter Communication Starting
Station Number (Administrator) (H304) and the largest master station number in the Co-inverter
Communication Ending Station Number (Administrator) (H305).
• In the Co-inverter Communication Start Selection (H306), set how to start inverter communications.
When “0: Input terminal[DI1] to [DI8] Co-inverter communication start (485)” is selected for Co-inver-
ter Communication Start Selection (Administrator) (H306), allocate “160: 485 (Start co-inverter com-
munication)” to one of the Input Terminal [DI1] Function Selection to Input Terminal [DI7] Function
Selection (E01 to E05, E98, E99).
• In H339 to H354, set the following parameters, which are required when the master inverter writes
data: the number of sent data, recipient station number, recipient register address, and sender regis-
ter address.
Co-inverter Communication Operation
1. The master inverter sends data to one or more slave inverters according to the settings for
that master inverter.
(This data is also sent to the management inverter that does not serve as the master inverter.)
2. The management inverter sends the master switching command and the master inverter is
switched accordingly.
3. The next master inverter sends data to one or more slave inverters in the same manner as
explained in step (1).
(This data is also sent to the management inverter that does not serve as the master inverter.)
4. Steps (2) and (3) are followed repeatedly.
8 Communications Functions
8-31
M1 Series Standard Type User's Manual (I669)
8-8 Co-inverter Communication
8
8-8-2 Co-inverter Communication Settings
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