Danfoss VLT AutomationDrive EZ FC 321, Programming Manual

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Option Name Description
The drive does not issue a missing motor phase alarm.
[1] On Before each start, the drive 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 Missing Motor Phase Function .
The table details the motor check at start for different motor modes.
Table 262: Motor Check at Start for Different Motor Types
Option Motor Check
at Start
U/f VVC
+
Flux
open
loop Flux
closed
loop
[0] Off No function.
[1] On
(1)
Check for missing motor phase before start is executed or enables
3-phase detection for U/f and VVC
+
in parameter 4-58 Missing Motor
Phase Function .
1
When the motor check is done at start and a missing motor phase is detected, the motor starts at trip 10 ms. This means that parameter 4-58
Missing Motor Phase Function is set to [1] Trip 100 ms .
When parameter 4-59 Motor Check At Start is set to [1] On , do not set parameter 4-58 Missing Motor Phase Function to the following
options:
[0] Disabled
[5] Motor check
4.5.6 4-6* Speed Bypass
Some systems require that certain output frequencies or speeds are avoided due to resonance problems in the system. A maximum
of 4 frequency or speed ranges can be avoided.
Parameter 4-60 Bypass Speed From [RPM]
Table 263: Parameter 4-60 Bypass Speed From [RPM]
4-60 Bypass Speed From [RPM]
Default value: Size related Parameter type: Range, 0 - par. 4-13 RPM, Array [4] Setup: All setups
Conversion index: 67 Data type: Uint16 Change during operation: True
Some systems call for avoiding certain output speeds due to resonance problems in the system. Enter the lower limits of the speeds
to be avoided.
Parameter 4-61 Bypass Speed From [Hz]
Table 264: Parameter 4-61 Bypass Speed From [Hz]
4-61 Bypass Speed From [Hz]
Default value: Size related Parameter type: Range, 0 - par. 4-14 Hz, Array [4] Setup: All setups
Conversion index: -1 Data type: Uint16 Change during operation: True
Some systems require that certain output frequencies or speeds are avoided due to resonance problems in the system. Enter the
lower limits of the speeds to be avoided.
AU373327181955en-000101 / 130R1208 | 137 Danfoss A/S © 2021.08
Parameter Descriptions
VLT® AutomationDrive EZ FC 321
Programming Guide