Encoder Monitoring - Lenze i55AE125B Manual

Additional functions
Encoder settings

Encoder monitoring

11.18.2 Encoder monitoring
For monitoring the HTL encoder, two monitoring functions are implemented in the inverter
firmware:
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.
Preconditions
The encoder signal loss monitoring is only active if the HTL encoder
•
is set as feedback system for the motor control or
•
used as signal source for the
•
For the encoder signal loss monitoring ,the inverter must be enabled and the motor must
•
rotate.
The encoder maximum frequency monitoring is active as soon as the HTL encoder has
•
been configured.
Restrictions
The encoder signal loss monitoring does not work anymore if the
•
active.
^ 437
The response time of the encoder signal loss monitoring depends on the setting of the
•
encoder increments/revolution in
The settings of the speed controller can influence the encoder signal loss monitoring. If the
•
reset time of the speed controller is very low or deactivated, an encoder signal loss cannot
be detected at switch-on.
If the HTL encoder is used as signal source for the
•
signal loss cannot be detected at switch-on.
Combined with the "Holding brake control" function:
•
In order that the encoder signal loss monitoring is not triggered by mistake, monitoring
•
will only be activated when the holding brake is released.
If Brake closing time
•
(P712.03) are not set correctly, the encoder signal loss monitoring can be triggered
although an encoder signal is available.
4Holding brake control
498
"Position counter" function.
0x2C42:001 (P341.01).
"Position
0x2820:002 (P712.02) and Brake opening time
^ 472
^ 493
"DC braking" function is
counter" function, an encoder
0x2820:003