NORD Drivesystems BU2200 - Manual (Page 32)

6 Error monitoring and error messages
32 BU 2200 GB-3813
6. Error monitoring and error messages
The motor control device (e.g: frequency inverters) and technology units generate appropriate
messages according to the cause if they deviate from their normal operating status.
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6.1 Bus operation monitoring function
The following monitoring functions are available for bus operation.
• Timeout monitoring at the field bus level
– Bus-specific watchdogs
– Parameter (P151)
• Timeout monitoring at system bus level
– Parameter (P120) or (P513)
• Function monitoring within the bus module
– Parameter (P170)
With the aid of the "Timeout Monitoring" communication problems are detected, which are either
related to general functionalities ("No bus communication") or are related to special modules ("Failure
of a participant").
General process data monitoring with a technology unit (SK xU4…)
The parameter (P151) "Timeout external bus" generally monitors the existence of bus communication.
If no process data is received within the parameterised monitoring time (The content of the process
data is irrelevant) the subscriber assumes that the bus communication to this subscriber is generally
faulty and reports an error.
This function is activated when the first valid process data telegram is received.
Information Process data control word BIT 10
This error is also triggered if process data with an invalid control word (Bit 10 in control word = 0) is received.
General monitoring of frequency inverter process data
SK 500E series frequency inverters offer the facility for monitoring the active bus interface by means
of the parameter (P513) "Telegram timeout". If the frequency inverter does not receive a telegram
within the time entered here, it assumes that there is a general fault with the bus communication and
reports an error.
With SK 180E .. SK 2xxE series frequency inverters, the function of this parameter is implemented by
parameter (P120). Communication errors are therefore reported via the bus module. Parameterisation
of (P513) is therefore not necessary. (P513) should be left at the factory setting.
Option monitoring
With the parameter (P120) "Option monitoring", SK 180E … SK 2xxE series frequency inverters
provide the facility for monitoring connected technology units (SK xU4…) with regard to their current
functional status. Generally, this function corresponds to monitoring via parameter (P513). This
parameter (P513) should therefore be left at the factory setting.
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