Op-
tion
Name
Description
This option is relevant for applications where the motor load and motor currents are very low, such as
lowering a lift. Selecting this option allows to prevent false motor phase detection due to low currents.
The drive performs a scan for 100 ms to detect missing motor phases.
[5]
Motor
check
N O T I C E
The motor automatically resumes operation when the motor is reconnected.
This option allows disconnection of the motor with a service switch without issuing an alarm. The drive
coasts and automatically resumes operation when the motor is reconnected.
The following table details the detection of missing motor phase function for different motor types:
Table 260: Missing Motor Phase for Different Motor Types
Op-
tion
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
(1)
Detects 1–3 phase
(1)
[2]
Trip 1000 ms
Detects missing 1
phase
(1)
Detects missing 1
phase
(1)
Detects missing 1
phase
(1)
N/A
[3]
Trip 100 ms 3
phase limit
N/A
Detects 1–3 phase
[5]
Motor check
(service switch)
Coasts if motor is disconnected or auto started when the motor is reconnected.
1
When
parameter 4-58 Missing Motor Phase Function
is set to
[1] Trip 100 ms
or
[3] Trip 100 ms 3ph detec.
, phase detection is enabled for U/f and VVC
+
motor types.
Parameter 4-59 Motor Check at Start
Table 261: Parameter 4-59 Motor Check at Start
4-59 Motor Check at Start
Default value: [0] Off
Parameter type: Option
Setup: All setups
Conversion index: –
Data type: Uint8
Change during operation: True
N O T I C E
This parameter cannot be adjusted while the motor is running.
This function detects missing motor phase before each start. Shows
alarm 30
,
alarm 31
,
alarm 32
if motor phases are missing. 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.
Option Name Description
[0]*
Off
C A U T I O N
RISK OF MOTOR DAMAGE
Using this option may lead to motor damage.
AU373327181955en-000101 / 130R1208
136 | Danfoss A/S © 2021.08
Parameter Descriptions
VLT® AutomationDrive EZ FC 321
Programming Guide
