ABB ACQ810, Firmware Manual

Page: 64 / 376

64 Program features
„
Protective functions
Pressure monitoring
The control program contains protective functions for two-level analog or single-level
digital pressure monitoring of both the inlet and outlet of the pump.
In analog monitoring, whenever the pressure being monitored meets the first limit, the
drive indicates a warning, trips on a fault, or starts to follow a pre-defined reference.
When the second limit is met, the drive either stops or trips on a fault.
In digital pressure monitoring, one limit is observed. Whenever the limit is met, the
drive indicates an alarm, trips on a fault, or starts to follow a pre-defined reference.
Flow monitoring
The control program has a monitoring function for flow that can be configured to
generate an alarm or a fault whenever the flow falls below or rises above predefined
limits.
The flow can either be calculated or measured using a flow meter connected to, for
example, an analog input.
Application profile monitoring
The application profile monitoring function can be used for long-term supervision of
an actual signal. If the selected signal remains above the supervision limit for a
specified time, an alarm is generated.
For example, monitoring the deviation between the PID controller setpoint and actual
value (parameter
04.04 Process PID err ) gives an indication of the general condition
of the pump, piping and valves. On the other hand, the PID controller output
(parameter
04.05 Process PID out ) remaining at 100% for a long time would indicate
a leak in the outlet piping.
Settings
Parameter group 81 Pump protection (page 271 ).
Diagnostics
Parameters 06.20 Pump status word (page 130 ), 08.20 Pump fault word (page 133 )
and 08.21 Pump alarm word (page 134 ).