Danfoss VLT HVAC FC 100, Service Manual, Page: 34 / 220

Protection md
The FC 100/200/300 has detected a critical status (e.g., an overcurrent, overvoltage). To avoid
tripping the adjustable frequency drive (alarm), protection mode is activated, which includes re-
ducing the switching frequency to 4 kHz. If possible, protection mode ends after approximately
10 s. Activation of protection mode can be restricted by adjusting the par. 14-26
Trip Delay at
Inverter Fault
.
QStop
The motor is stopped using a quick stop ramp par. 3-81
Quick Stop Ramp Time
.
1. Quick stop inverse was chosen as a function for a digital input (parameter group 5-1*).
The corresponding terminal (e.g., Terminal 27) is not active.
2. The Quick stop function was activated via serial communication.
Ramping
The motor is accelerating/decelerating using the active Ramp Up/Down. The reference, a limit
value or a standstill is not yet reached.
Ref. high
In par. 4-55
Warning Reference High
, a reference high limit is set. The sum of all active references
is above the reference limit.
Ref. low
In par. 4-55 Warning Reference High , a reference low limit is set. The sum of all active references
is below the reference limit.
Run on ref.
The adjustable frequency drive is running in the reference range. The feedback value matches
the set reference value.
Run request (FC 100/200 only)
A start command has been given, but the motor will be stopped until a
Run permissive
signal is
received via digital input.
Running
The motor is driven by the adjustable frequency drive, the ramping phase is done and the motor
revolutions are outside the
On Reference
range. Occurs when one of the motor speed limits (Par.
4-11/4-12/4-13 or 4-14) is set, but the maximum reference is outside this range.
Sleep Boost (FC 100/200 only)
The boost function in parameter 406 Boost setpoint is enabled. This function is only possible in
Closed-loop
operation.
Sleep Mode
(FC 100/200)
The energy saving function in parameter 403
Sleep mode timer
is enabled. This means that at
present the motor has stopped, but that it will restart automatically when required.
Slow
The output frequency is corrected by the value set in par. 3-12
Catch up/slow-down Value
.
1. Slow was selected as a function for a digital input (parameter group 5-1*). The corre-
sponding terminal is active.
2. Slow was activated via serial communication.
Speed high
In par. 4-53
Warning Speed High
, a value is set. The speed of the motor is above this value.
Speed low
In par. 4-52
Warning Speed Low
, a value is set. The speed of the motor is below this value.
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
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