Specifications

4
PRE-OPERATION INSTRUCTIONS
1.3 MNS LED (operation status indication)
The MNS LED indicates the operating status of the option unit by its indication status.
Check the position of LED on page 3.
* Time limit = 4 × EPR (EPR = Expected Pack Rate Class 0x05 Instance 1 Attribute 9 (refer to page 61))
LED
Indication
Operating Status Note
Off
Inverter power off
Network power off
Own node only on the network
· Turn inverter power on. Option unit will then complete duplicate
station number test.
· Check the voltage of the network power.
· Add other nodes to the network.
Green
(flickering)
Network and inverter power on
Connection not yet
established by host
The inverter power turns on and duplicate of node address is being
checked. However, a host has not yet established a communication
link.
Green (lit)
Network and inverter power on
Connection established by
host
A master device on the network has designated the option unit for
communications.
LED holds the state also during communication.
Red (flickering) Connection time-out
Master designated the option unit for communication on the
network, but then sent no messages within the time limit * set in the
expected packet rate.
Red (lit) Critical link failure
Check for the followings.
· Duplicate node address on the network
· Cable from option unit to network not connected or severed.
· Network damaged
Take the appropriate corrective action, then reset the inverter to
recover from the fault.