Illustration 3.3: Controlled Ramp-down, longer mains failure. Ramping down as long as the energy in the system allows for it, then the motor is coasted.
Illustration 3.4: Kinetic Back-up, short mains failure. Ride through as long as the energy in the system allows for it.
Illustration 3.5: Kinetic Back-up, longer mains failure. The motor is coasted as soon as the energy in the system is too low.
14-11 Mains Voltage at Mains Fault
Range: Function:
342 V
*
[150 - 600 V]
This parameter defines the threshold voltage at which the selected function in par. 14-10 should be activated.
14-12 Function at Mains Imbalance
Option: Function:
Operation under severe main imbalance conditions reduces the lifetime of the motor. Conditions are considered
severe if the motor is operated continuously near nominal load (e.g. a pump or fan running near full speed).
3. Parameter Description VLT
®
HVAC Drive Programming Guide
126
MG.11.C5.02 - VLT
®
is a registered Danfoss trademark
3
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