Velleman VMB4DC - Manual (Page 7)

VMB4DC 4-channel dimmer controller module user manual – version 3 7
LED INDICATIONS
Output LED:
• off when output voltage = 0V
• on when output voltage is stable
• blinks rapidly when output voltage
changes
• blinks slowly when switch-off delay
is running
• blinks shortly twice at
communication error
On LED:
lights when power
voltage is present
Rx LED:
lights at Velbus data
reception
Tx LED:
lights at Velbus data transfer