Hitachi WJ200-001S Instruction Manual page 356

B21
Note2: The command to change a master from 01 to 02 is issued after the data is sent from
master inverter 01 to slave and silent interval plus communication wait time (C078) passed.
Note 3: Administrative inverter issues the next command to change a master after the data
from master inverters is sent and silent interval plus communication wait time (C078)
passed. In case the data from master inverter cannot be received within the communication
timeout (C077), then the inverter timeouts and the behaves according to the communication
error selection.
Note 4: Please set the communication timeout as it is valid (C077=0.01 ～99.99). If it is
disabled (C077=0.0), EzCOM function is interrupted in case the data from master inverter
was not received. In case it is interrupted, please turn on/off the power or reset (reset terminal
on/off).