Control ready
PROFIDrive profile
was selected in par. 8-10
Control Word Profile
. The adjustable frequency drive
needs the second part (e.g., 0x047F) of the two-part start command via serial communication to
allow starting. Using a terminal is not possible.
Ctrl. Ramp-down
A function with Ctrl. Ramp-down was selected in par. 14-10
Line Failure
. The AC line voltage is
below the value set in par. 14-11
Line Voltage at Line Fault
. The adjustable frequency drive ramps
down the motor using a controlled ramp-down.
Current High
In par. 4-51
Warning Current High
, a current limit is set. The output current of the adjustable
frequency drive is above this limit.
Current Low
In par. 4-52
Warning Speed Low
, a current limit is set. The output current of the adjustable fre-
quency drive is below this limit.
DC Hold
The motor is driven with a permanent DC current, par. 2-00
DC Hold Current
. DC hold is selected
in par. 1-80
Function at Stop
. A Stop command (e.g. Stop (inverse)) is active.
DC Stop
The motor is momentarily driven with a DC current, par. 2-01
DC Brake Current
, for a specified
time, par. 2-02
DC Braking Time
.
1.
DC Brake is activated (OFF) in par. 2-03
DC Brake Cut-in Speed [RPM]
and a Stop com-
mand (e.g., Stop (inverse)) is active.
2.
DC Brake (inverse) is selected as a function for a digital input (parameter group 5-1*).
The corresponding terminal is not active.
3.
The DC Brake is activated via serial communication.
DC Voltage U0
In par. 1-01
Motor Control Principle
U/f and in par. 1-80
Function at Stop
DC Voltage U0 is selected.
A Stop command (e.g. Stop (inverse)) is activated. The voltage selected according to the
par. 1-55
U/f Characteristic - U
[0] (U/f Characteristic – U[V]) is applied to the motor.
Feedback high
In par. 4-57
Warning Feedback High
, an upper feedback limit is set. The sum of all active feed-
backs is above the feedback limit.
Feedback low
In par. 4-56
Warning Feedback Low
, a lower feedback limit is set. The sum of all active feedbacks
is below the feedback limit.
Flying start
In par. 1-73
Flying Start
, the flying start function is activated. The adjustable frequency drive is
testing if the connected motor is running with a speed that is in the adjusted speed range. The
process was started by connecting a digital input (parameter group 5-1*) programmed as Coast
inverse or by connecting to line power.
Freeze output
The remote reference is active and the momentarily given speed is saved.
1.
Freeze output was selected as a function for a digital input (Group 5-1*). The corre-
sponding terminal is active. Speed control is only possible via the terminal functions
Speed up and Slow.
2.
Hold ramp is activated via serial communication.
High Power Service Manual for VLT
®
FC Series
Adjustable Frequency Drives
2 Operator Interface and Adjustable Frequen-
cy Drive Control
MG.90.L1.22 - VLT
®
is a registered Danfoss trademark
2-9
2
Summary of Contents for VLT HVAC FC 100
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