Danfoss VLT Series Programming Manual page 110

Parameter Description
DC Voltage
Output Speed rpm
Over Voltage Control Level
Par 14-11
Mains
Illustration 3.4 Controlled Ramp down - short mains failure.
Ramping down to stop followed by ramping up to reference.
DC Voltage
Output Speed rpm
Over Voltage Control Level
Par 14-11
Mains
Illustration 3.5 Controlled Ramp down, longer mains failure.
Ramping down as long as the energy in the system allows for it,
then the motor is coasted.
DC Voltage
Output Speed rpm
Over Voltage Control Level
Par 14-11
Mains
Illustration 3.6 Kinetic Back-up, short mains failure. Ride through
as long as the energy in the system allows for it.
DC Voltage
Output Speed rpm
Over Voltage Control Level
Par 14-11
Mains
Illustration 3.7 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 This parameter defines the threshold
*
V] voltage at which the selected
function in 14-10 Mains Failure should
be activated. The detection level is at
a factor 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 continuously 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.
*
®
VLT HVAC Drive Programming Guide
[1]
Time
[2]
[3]
Parameters for configuring auto reset handling, special trip
handling and control card self test or initialisation.
Time
[0]
[1]
Time
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10] Automatic reset x 10
Time
[11] Automatic reset x 15
[12] Automatic reset x 20
[13] Infinite auto reset
NOTE
Automatic reset will also be active for resetting safe stop
function.
NOTE
The setting in 14-20 Reset Mode is disregarded in case of
Fire Mode being active (see parameter group 24-0*, Fire
Mode).
10 s
®
MG.11.CC.02 - VLT is a registered Danfoss trademark
14-12 Function at Mains Imbalance
Option: Function:
Warning Select Warning [1] to issue a warning.
Disabled Select Disabled [2] for no action.
Derate Select Derate [3] for derating the frequency
converter.
14-20 Reset Mode
Option: Function:
Select the reset function after
tripping. Once reset, the frequency
converter can be restarted.
Manual reset Select Manual reset [0], to perform a
*
reset via [RESET] or via the digital
inputs.
Automatic reset x 1 Select Automatic reset x 1...x20 [1]-
[12] to perform between one and
twenty automatic resets after
tripping.
Automatic reset x 2
Automatic reset x 3
Automatic reset x 4
Automatic reset x 5
Automatic reset x 6
Automatic reset x 7
Automatic reset x 8
Automatic reset x 9
Select Infinite Automatic Reset [13] for
continuous resetting after tripping.
14-21 Automatic Restart Time
Range: Function:
[0 - 600 s] Enter the time interval from trip to start of
*
the automatic reset function. This parameter
is active when 14-20 Reset Mode is set to
Automatic reset [1] - [13].
3 3
109