Lenze i55AE155F

11.18.2 Encoder monitoring
For monitoring the HTL encoder, two monitoring funcons are implemented in the inverter
rmware:
a)
Encoder signal loss monitoring: Is triggered if a failure of the encoder signal is detected
(e. g. due to open circuit or failure of the encoder current supply).
b)
Encoder maximum frequency monitoring: Is triggered if the calculated encoder maximum
frequency is beyond the permissible frequency range of the digital inputs.
Precondions
•
The encoder signal loss monitoring is only acve if the HTL encoder
•
is set as feedback system for the motor control or
•
used as signal source for the "Posion counter" funcon. ^ 493
•
For the encoder signal loss monitoring ,the inverter must be enabled and the motor must
rotate.
•
The encoder maximum frequency monitoring is acve as soon as the HTL encoder has
been congured.
Restricons
•
The encoder signal loss monitoring does not work anymore if the "DC braking" funcon is
acve. ^ 437
•
The response me of the encoder signal loss monitoring depends on the seng of the
encoder increments/revoluon in 0x2C42:001 (P341.01).
•
The sengs of the speed controller can inuence the encoder signal loss monitoring. If the
reset me of the speed controller is very low or deacvated, an encoder signal loss cannot
be detected at switch-on.
•
If the HTL encoder is used as signal source for the "Posion counter" funcon, an encoder
signal loss cannot be detected at switch-on.
•
Combined with the "Holding brake control" funcon:
•
In order that the encoder signal loss monitoring is not triggered by mistake, monitoring
will only be acvated when the holding brake is released.
•
If Brake closing me 0x2820:002 (P712.02) and Brake opening me 0x2820:003
(P712.03) are not set correctly, the encoder signal loss monitoring can be triggered
although an encoder signal is available.
4Holding brake control ^ 472
Addional funcons
Encoder sengs
Encoder monitoring
498