TECO F33 Series, Инструкция по эксплуатации, Страница: 118 / 192

Functional Description 115
11.4.2 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
override function is enabled, the VSD will automatically
decrease the motor speed to keep control of the appli-
cation 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 standstill. 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. 100.
Communication information
Fig. 100 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,
thermal relay or output filter. Motor lost will cause a
trip, and the motor will coast to standstill, when a miss-
ing 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 protect.
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
Low Volt.
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