Settings and diagnostics
Parameters: 31.12 Autoreset selection…31.16 Delay time (page 369).
￭
Other programmable protection functions
External events (parameters
31.01
…
31.10
)
Five different event signals from the process can be connected to selectable inputs
to generate trips and warnings for the driven equipment. When the signal is lost,
an external event (fault, warning, or a mere log entry) is generated. The contents
of the messages can be edited on the control panel by selecting Menu - Settings
- Edit texts.
Motor phase loss detection (parameter
31.19
)
The parameter selects how the drive reacts whenever a motor phase loss is
detected.
Earth (Ground) fault detection (parameter
31.20
)
The earth fault detection function is based on sum current measurement. Note
that
• an earth fault in the supply cable does not activate the protection
• in a grounded supply, the protection activates within 2 milliseconds
• in an ungrounded supply, the supply capacitance must be 1 microfarad or more
• the capacitive currents caused by shielded motor cables up to 300 meters will
not activate the protection
• the protection is deactivated when the drive is stopped.
Safe torque off detection (parameter
31.22
)
The drive monitors the status of the Safe torque off input, and this parameter
selects which indications are given when the signals are lost. (The parameter does
not affect the operation of the Safe torque off function itself). For more information
on the Safe torque off function, see the
Hardware manual
.
Swapped supply and motor cabling (parameter
31.23
)
The drive can detect if the supply and motor cables have accidentally been swapped
(for example, if the supply is connected to the motor connection of the drive). The
parameter selects if a fault is generated or not. Note that the protection should
be disabled in drive/inverter hardware supplied from a common DC bus.
Program features 135
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