Danfoss VLT AutomationDrive FC 301 Programming Manual page 89

Parameter Descriptions
4-54 Warning Reference Low
Range:
-999999.999 [ -999999.999 -
*
par. 4-55]
4-55 Warning Reference High
Range:
999999.999 [ par. 4-54 - Enter the upper reference limit.
*
999999.999] When the actual reference exceeds
this limit, the display reads Ref
The signal outputs can be
programmed to produce a status
signal on terminal 27 or 29 (FC
302 only) and on relay output 01
or 02 (FC 302 only).
4-56 Warning Feedback Low
Range:
-999999.999 [ -999999.999 -
ReferenceFeed- par. 4-57
backUnit ReferenceFeed-
*
backUnit]
4-57 Warning Feedback High
Range:
999999.999 [ par. 4-56 -
ReferenceFeed- 999999.999
backUnit ReferenceFeed-
*
backUnit]
4-58 Missing Motor Phase Function
Option: Function:
NOTICE
This parameter cannot be adjusted while
the motor is running.
MG33ML02
Programming Guide
Function:
Enter the lower reference limit.
When the actual reference drops
below this limit, the display
indicates Ref . The signal
LOW
outputs can be programmed to
produce a status signal on
terminal 27 or 29 (FC 302 only)
and on relay output 01 or 02 (FC
302 only).
Function:
high
Function:
Enter the lower feedback
limit. When the feedback
drops below this limit, the
display reads Feedb .
Low
The signal outputs can be
programmed to produce
a status signal on terminal
27 or 29 (FC 302 only)
and on relay output 01 or
02 (FC 302 only).
Function:
Enter the upper feedback
limit. When the feedback
exceeds this limit, the
display reads Feedb .
High
The signal outputs can be
programmed to produce
a status signal on
terminal 27 or 29 (FC 302
only) and on relay output
01 or 02 (FC 302 only).
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4-58 Missing Motor Phase Function
Option: Function:
The missing motor phase function detects
whether the motor phase is missing during
motor rotation. Shows alarm 30, 31, or 32 in the
event of a missing motor phase. Enable this
function to avoid motor damage.
[0] Disabled The frequency converter does not issue a
missing motor phase alarm. Not recommended
due to risk of motor damage.
[1] Trip 100 For a quick detection time and alarm in the
ms event of a missing motor phase.
[2] Trip 1000
ms
[3] Trip 100ms Special option relevant for crane applications
3ph detec. when lowering a small load that lets the
.
frequency converter avoid false detections of
missing motor phase.
This option is a reduced version of option [1]
Trip 100 ms.
1-phase missing is handled as in option [1] Trip
100 ms. 3-phase detection is reduced compared
to option [1] Trip 100 ms.
The 3-phase detection is only working at start-
up and in the low speed range where a
significant current is running, avoiding false trips
during small motor current.
NOTICE
Only available for FC 302 flux closed loop.
[5] Motor The frequency converter detects automatically
Check when the motor is disconnected and resumes
operation once the motor is connected again.
NOTICE
Valid for FC 302 only.
4-59 Motor Check At Start
Option: Function:
NOTICE
This parameter cannot be adjusted while the
motor runs.
NOTICE
Valid for FC 302 only
Use this parameter to detect the missing motor phase
during motor stand-still. Shows alarm 30, Motor phase
U missing, alarm 31, Motor phase V missing, or alarm
32, Motor phase W missing in the event of a missing
motor phase during stand-still. Use this function
before disengaging a mechanical brake. Enable this
function to avoid motor damage.
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