Danfoss vlt FC 102 - Page 86

4-56 Warning Feedback Low
Range: Function:
-999999.99
9
ProcessCtrl
Unit*
[ -999999.999
- par. 4-57
ProcessCtrlUnit
]
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, and on
relay output 01 or 02.
4-57 Warning Feedback High
Range: Function:
999999.999
ProcessCtrl
Unit*
[ par. 4-56 -
999999.999
ProcessCtrlUnit
]
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, and on
relay output 01 or 02.
4-58 Missing Motor Phase Function
Option: Function:
NOTICE
This parameter cannot be
adjusted while the motor is
running.
Shows an alarm if a motor phase is
missing.
[0] Disabled No alarm is shown if a missing
motor phase occurs.
[2] * Trip 1000 ms The drive performs a scans for
1000 ms to detect a missing motor
phase. When a missing motor
phase is detected, the drive trips.
This selection is recommended
when the motor is running at a low
speed ranging from 1 - 10 Hz.
[5] Motor Check This option allows disconnection of
the motor with a service switch
without issuing an alarm. The drive
coasts and automatically resume
operation when the motor is
connected again.
CAUTION
The motor automatically
resumes operation when the
motor is connected again.
The following table details detection of missing motor
phase function for dierent motor types:
Option Missing
motor phase
function
U/f
VVC
+
Flux
Open
Loop
Flux
Closed
Loop
[0] Disabled No function
[1] Trip 100 ms Detects
missing 1
phase
1)
Detects
missing 1
phase
1)
Detects
1-3
phase
Detects
1-3
phase
[2] Trip 1000 ms Detects
missing 1
phase
1)
Detects
missing 1
phase
1)
Detects
1-3
phase
N/A
[5] Motor check
(service
switch)
Coast if motor is disconnected or auto
started when motor is connected back.
Table 3.11 Missing Motor Phase for Dierent Motor Types
1: When parameter 4-59 Motor Check At Start is set to
option [1] , phase detection is enabled for U/f and VVC
+
motor types.
4-59 Motor Check At Start
Option: Function:
NOTICE
This parameter cannot be
adjusted while the motor is
running.
This function detects missing motor
phase before each start. Shows the
alarm 30, alarm 31, alarm 32 incase
of missing motor phase. In these
cases, the drive trips and an alarm
is issued.
The function has been developed
to avoid disengaging a mechanical
brake if motor phases are missing,
for example, in lift applications.
[0] * O
CAUTION
RISK OF MOTOR DAMAGE
Using this option may lead to
motor damage.
The frequency converter does not
issue a missing motor phase alarm.
[1] On Before each start, the frequency
converter checks if all 3 motor
phases are present. The check is
performed without any shaft
movement. The function also
enables 3 phase detection in U/f
and VVC+ mode. See description in
parameter 4-58.
Parameter Descriptions
VLT
®
HVAC Drive FC 102
84 Danfoss A/S © 10/2019 All rights reserved. M0010001
33