DC Voltage
Output Speed rpm
Over Voltage Control Level
Mains
Time
130B
T101.10
Par 14-11
Illustration 3.2 Controlled Ramp down - short mains failure. Ramping down to stop followed by ramping up to reference.
Mains
Time
DC Voltage
Output Speed rpm
Over Voltage Control Level
130B
T108.10
Par 14-11
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.
Over Voltage Control Level
DC Voltage
Output Speed rpm
Mains
Time
130B
T100.10
Par 14-11
Illustration 3.4 Kinetic Back-up, short mains failure. Ride through as long as the energy in the system allows for it.
Mains
Time
DC Voltage
Output Speed rpm
Over Voltage Control Level
130B
T109.10
Par 14-11
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:
Size related
*
[180 - 600
V]
This parameter defines the threshold
voltage at which the selected function
in
should be
activated. The detection level is at a
faktor sqrt(2) of the value in 14-11.
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 contin-
uously near nominal load (e.g. a pump or fan
running near full speed).
When a severe mains imbalance is detected:
[0]
*
Trip
Select
Trip
[0] to trip the frequency converter.
[1]
Warning Select
Warning
[1] to issue a warning.
[2]
Disabled Select
Disabled
[2] for no action.
14-12 Function at Mains Imbalance
Option:
Function:
[3]
Derate
Select
Derate
[3] for derating the frequency
converter.
Parameter Description
VLT
®
HVAC Drive Programming Guide
104
MG.11.CB.02 - VLT
®
is a registered Danfoss trademark
3
3
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