LX08 Phase Current Check
This parameter can be used to select what type of current check is performed; there are
two variations:
• The DC Ramp checks for current across all phases.
• High frequency voltage detection (HF Voltage). High frequency voltage detection is
the most reliable however in some cases it can generate more audible noise from the
motor.
In the event there is a problem getting a consistently positive phase current check, the
and block operation.
In general, phase current check is required by the elevator safety code Therefore it is not
possible to run without it. For troubleshooting purposes, it is possible to switch this
function off temporarily. However, after a power cycle of the drive, if the function is
switched off, it will automatically be switched on to DC Ramp during boot up. This could
be useful during the construction phase of the elevator.
The quality of the phase check result is monitored. If the drive senses the quality of the
result is degrading, the drive will generate in the event log.
This could help to detect a problem with the motor contactor or connection to the motor
before it completely stops the operation of the elevator.
The process is initiated at the beginning of a run with the STO active and a direction
input. The phase current check completes in approximately 300ms.
This function creates a slope between two successive speed values which are
transferred serially. This parameter should be adjusted for a time double the actual serial
update rate of the speed command. The function smooths out the relatively coarse steps
which can occur during rapidly changing speed commands.
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