Safety and commissioning information for Ex areas
14.2 Dry-running protection for centrifugal pumps by active power monitoring
SIMOCODE pro
System Manual, 05/2019, A5E40507475002A/RS-AD/004
319
14.2.3.3 Special conditions for commissioning and operation
Commissioning and operation of the centrifugal pumps to be protected
You must commission and operate the centrifugal pumps that are to be protected in
accordance with the pump manufacturer's stipulations.
Suitability of the device for control of ignition sources
The device for control of ignition sources is suitable for centrifugal pumps with progressive
flow characteristics with sufficient distance between the active powers P
MIN
at the minimum
flow rate Q
MIN
and P
OPT
at the operating point Q
OPT
with P
MIN
/ P
OPT
< 0.80.
Setting the required switching levels
Set the dry-running protection by active power monitoring to the required switching level
and check that it is working correctly.
The equipment may not be used as a device for control of ignition sources for monitoring
the liquid filling of a centrifugal pump installed in a potentially explosive atmosphere until
the combination pump/motor/shutdown has been successfully tested.
Checking the set parameter values
Check the parameter values that have been set with respect to their suitability for the
protection function in terms of avoiding dry running when required (following any changes in
the pump or system characteristics, e.g. as a result of changing the operating medium or of
intervention in the plant configuration). Correct the parameter values where necessary.
To determine the active power from which the trip level is derived, you must only use the
corresponding 3UF7 system with which the shutdown function is also realized. External
measuring equipment is not permitted for determining the active power.
Make sure that the pump is shut down when the limit values for monitoring are reached.
Take steps to ensure that the drive motor cannot automatically restart.
Acknowledge any fault manually once it has been remedied.
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