Delta MH300 Series - Page 460

Chapter 12 Description of Parameter Settings
MH300
12.1-07-7
 The following explains the dEb action:
When the DC voltage drops below the dEb setting level, the dEb function starts to work (soft start
relay remains closed), and the drive executes auto-deceleration.
 Situation 1: Momentary power loss, or power current too low and unstable, or power supply sliding
down because of sudden heavy load.
Pr.07-13=1, “dEb active, DC bus voltage returns, output frequency does not return” and power
recovers.
When the power recovers and DC bus voltage exceeds the dEb return level, the drive linearly
decelerates to 0 Hz and stops. The keypad displays the “dEb” warning until you manually reset it, so
that you can see the reason for the stop.
 Situation 2: Momentary power loss, or power current too low and unstable, or power supply sliding
down because of sudden heavy load.
Pr.07-13=2 “dEb active, DC bus voltage returns, output frequency returns” and power recovers.
During the dEb deceleration (includes 0 Hz run), if the power recovers higher than dEb return
level, the drive maintains the frequency for three seconds and then accelerates again. The dEb
warning on the keypad clears automatically.