Stall protection (parameters
31.24
…
31.28
)
The drive protects the motor in a stall situation. It is possible to adjust the
supervision limits (current, frequency and time) and choose how the drive reacts
to a motor stall condition.
Overspeed protection (parameter
31.30
)
The user can set overspeed limits by specifying a margin that is added to the
currently-used maximum and minimum speed limits.
Ramp stop supervision (parameters
31.32
,
31.33
,
31.37
and
31.38
)
The control program has a supervision function for both the normal and emergency
stop ramps. The user can either define a maximum time for stopping, or a maximum
deviation from the expected deceleration rate. If the drive fails to stop in the
expected manner, a fault is generated and the drive coasts to a stop.
Main cooling fan supervision (parameter
31.35
)
The parameter selects how the drive reacts to a loss of the main cooling fan.
With an inverter unit consisting of frame R8i inverter modules, it may be possible
to continue operation even if a cooling fan of an inverter module stops. See the
description of the parameter.
Custom motor current fault limit (parameter
31.42
)
The control program sets a motor current limit based on drive hardware. In most
cases, the default value is appropriate. However, a lower limit can be manually set
by the user, for example, to protect a permanent magnet motor from
demagnetization.
Local control loss detection (parameter
49.05
)
The parameter selects how the drive reacts to a control panel or PC tool
communication break.
136 Program features
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