Emotron AB 01-3694-01r2 Functional Description 111
11.5.2 Process Protection [420]
Submenu with settings regarding protection functions for
the VSD and the motor.
Low Voltage Override [421]
If a dip in the mains supply occurs and the low voltage over-
ride function is enabled, the VSD will automatically
decrease the motor speed to keep control of the application
and prevent an under voltage trip until the input voltage
rises again. Therefore the rotating energy in the motor/load
is used to keep the DC link voltage level at the override level,
for as long as possible or until the motor comes to a stand-
still. This is dependent on the inertia of the motor/load
combination and the load of the motor at the time the dip
occurs, see Fig. 97.
Communication information
Fig. 97 Low voltage override
Rotor locked [422]
With the rotor locked function enabled, the VSD will pro-
tect the motor and application when this is stalled whilst
increasing the motor speed from standstill. This protection
will coast the motor to stop and indicate a fault when the
Torque Limit has been active at very low speed for more
than 5 seconds.
Communication information
Motor lost [423]
With the motor lost function enabled, the VSD is able to
detect a fault in the motor circuit: motor, motor cable, ther-
mal relay or output filter. Motor lost will cause a trip, and
the motor will coast to standstill, when a missing motor
phase is detected during a period of 5 s.
Communication information
Default: On
Off 0
At a voltage dip the low voltage trip will pro-
tect.
On 1
At mains dip, VSD ramps down until voltage
rises.
Modbus Instance no/DeviceNet no: 43361
Profibus slot/index 170/10
Fieldbus format UInt
Modbus format UInt
NOTE: During the low voltage override the LED trip/limit
blinks.
421 Low Volt OR
Stp On
A
t
t
(06-F60new)
Override
level
Speed
DC link voltage
Default: Off
Off 0 No detection
On 1
VSD will trip when locked rotor is detected.
Trip message “Locked Rotor”.
Modbus Instance no/DeviceNet no: 43362
Profibus slot/index 170/11
Fieldbus format UInt
Modbus format UInt
Default: Off
Off 0
Function switched off to be used if no
motor or very small motor connected.
Trip 1
VSD will trip when the motor is discon-
nected. Trip message “Motor Lost”.
Modbus Instance no/DeviceNet no: 43363
Profibus slot/index 170/12
Fieldbus format UInt
Modbus format UInt
422 Rotor locked
Stp Off
A
423 Motor lost
Stp Off
A
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