Siemens SINAMICS G120 CU230P-2 HVAC Operating Instructions Manual page 272

Functions
7.9 Application-specific functions
In the energy-saving mode, the motor is shut down; however, the speed setpoint and/or the
technology controller deviation are/is monitored.
● For an external setpoint input (without technology controller) the speed setpoint is
● When the setpoint is entered from the technology controller, the technology controller
In order to prevent frequent starts and stops, the speed may be boosted for a short time
before shutdown (boost). This function can be disabled by setting the boost time (p2394) to
0.
To avoid tank deposits, particularly where liquids are present, it is possible to exit the
energy-saving mode after an adjustable time (p2396) has expired and switch to normal
operation.
The parameter settings required for the respective variant can be found in the following
tables.
270
monitored and the motor is switched-on again as soon as the setpoint increases above
the restart speed. The restart speed is calculated as follows: Restart
speed = P1080 + p2390 + p2393.
In the factory setting, the positive speed setpoint is monitored, i.e. the motor is switched
on as soon as the setpoint exceeds the restart speed.
If the negative speed setpoint is also to be monitored, the value of the setpoint must be
monitored. This can be set using p1110 = 0.
Additional setting options are described in the parameter list, in function diagrams 3030
and 3040 as well as in the associated parameter descriptions.
deviation (r2273) is monitoredand the motor is switched-on if the deviation of the
technology controller exceeds the energy-saving mode restart value (2392).
In the factory setting, only the positive deviation of the technology controller is monitored,
i.e. the motor is switched on as soon as the technology controller deviation is greater than
the energy-saving mode restart value (p2392).
If the motor should also switch back on for negative technology controller deviation, the
value of the deviation must be monitored.
In this case p2298 = 2292 must be set. The percentage value for the minimum limit can
be specified in p2292.
Additional setting options are provided in the parameter list in function diagram 7958 and
in the associated parameter descriptions.
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD