Danfoss VLT FC 102 Instruction Manual page 42

Diagnostics and Troubleshoo...
DC Stop
Feedback high
Feedback low
7 7
Freeze output
Freeze output
request
Freeze ref.
Jog request
40
VLT
The motor is held with a DC current (2-01 DC
Brake Current) for a specified time (2-02 DC
Braking Time).
•
DC Brake is activated in 2-03 DC Brake Cut-in
Speed [RPM] and a stop command is active.
•
DC Brake (inverse) is selected as a function
for a digital input (parameter group 5-1*
Digital Inputs). The corresponding terminal is
not active.
•
The DC Brake is activated via serial
communication.
The sum of all active feedbacks is above the
feedback limit set in 4-57 Warning Feedback
High.
The sum of all active feedbacks is below the
feedback limit set in 4-56 Warning Feedback
Low.
The remote reference is active, which holds the
present speed.
•
Freeze output was selected as a function for
a digital input (parameter group 5-1* Digital
Inputs). The corresponding terminal is active.
Speed control is only possible via the
terminal functions Speed Up and Slow.
•
Hold ramp is activated via serial communi-
cation.
A freeze output command has been given, but
the motor will remain stopped until a run
permissive signal is received.
Freeze Reference was chosen as a function for a
digital input (parameter group 5-1* Digital
Inputs). The corresponding terminal is active.
The adjustable frequency drive saves the actual
reference. Changing the reference is now only
possible via terminal functions Speed Up and
Slow.
A jog command has been given, but the motor
remains stopped until a run permissive signal is
received via a digital input.
®
HVAC Drive Instruction Manual
Jogging
Motor check
OVC control
PowerUnit Off
Protection md
QStop
MG11AJ22 - Rev. 2013-09-13
The motor is running as programmed in
3-19 Jog Speed [RPM].
•
Jog was selected as function for a digital
input (parameter group 5-1* Digital Inputs).
The corresponding terminal (e.g., Terminal
29) is active.
•
The Jog function is activated via the serial
communication.
•
The Jog function was selected as a reaction
for a monitoring function (e.g., No signal).
The monitoring function is active.
In 1-80 Function at Stop, Motor Check was
selected. A stop command is active. To ensure
that a motor is connected to the adjustable
frequency drive, a permanent test current is
applied to the motor.
Overvoltage control was activated in 2-17 Over-
voltage Control, [2] Enabled. The connected
motor is supplying the adjustable frequency
drive with generative energy. The overvoltage
control adjusts the V/Hz ratio to run the motor
in controlled mode and to prevent the
adjustable frequency drive from tripping.
(Only adjustable frequency drives with an
external 24 V power supply installed).
Line power supply to the adjustable frequency
drive is removed, but the control card is
supplied by the external 24 V.
Protection mode is active. The unit has detected
a critical status (an overcurrent or overvoltage).
•
To avoid tripping, switching frequency is
reduced to 4 kHz.
•
If possible, Protection mode ends after
approximately 10 s.
•
Protection mode can be restricted in
14-26 Trip Delay at Inverter Fault.
The motor is decelerating using 3-81 Quick Stop
Ramp Time.
•
Quick stop inverse was chosen as a function
for a digital input (parameter group 5-1*
Digital Inputs). The corresponding terminal is
not active.
•
The quick stop function was activated via
serial communication.