8. Peripherals and Options   
- 251 -
 ● Indicators
Indicator Indication State Description
D1/D2/D3 Encoder input 
signal indicator
ON or 
ash
The encoder has signal input.
OFF The encoder does not have signal input.
D6 Power indicator ON Normal.
OFF Power is not connected.
LED1 Encoder input 
signal quality 
indicator
ON Input signal is slightly instable, which occurs 
when motor accelerates/decelerates or 
encoder signal input suffers slight interference.
OFF Input signal is normal, speed is stable and 
there is no interference.
Flash 
slowly
Input signal is moderately instable, which 
occurs when motor accelerates/decelerates 
or encoder signal input suffers moderate 
interference.
Flash 
quickly
Input signal is seriously instable, which 
occurs when motor accelerates/decelerates 
quickly or encoder signal input suffers severe 
interference.
LED2 Signal 
processing 
quality 
indicator
ON Signal is slightly instable, which occurs when 
motor accelerates/decelerates or interference 
during signal input is not completely ltered 
(The number of interference pulses that are not 
ltered is less than 10 per time unit).
OFF Signal processing is normal, speed is stable 
and there is no interference.
Flash 
slowly
Signal is moderately instable, which occurs 
when motor accelerates/decelerates or 
interference during signal input is not 
completely ltered (The number of interference 
pulses that are not ltered is less than 30 per 
time unit).
Flash 
quickly
Signal is seriously instable, which occurs when 
motor accelerates/decelerates or interference 
during signal input is not completely ltered 
(The number of interference pulses that are not 
ltered is more than 30 per time unit).
LED3 Inter-lock state 
indicator
ON Inter-lock enabled.
OFF Inter-lock disabled.
LED4 System state 
indicator
ON Normal.
OFF The system is not operating or abnormal.
Flash The encoder cable breaks.