Siemens SINAMICS G120 CU230P-2, Operating Instructions Manual, Page: 275 / 346

Functions
7.9 Application-specific functions
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
273
Adjustable parameters for the energy-saving mode function
Table 7- 49 Main function parameters
Parameter Description Via tech.
setpoint
Via external
setpoint
P1080 = … Minimum speed
0 (factory setting) … 19500 rpm. Lower limit of the motor speed is
independent of the speed setpoint.
x x
P1110 = … Block negative direction
Parameter to block the negative direction
- x
P2200 = … Technology controller enable
0: Technology controller deactivated (factory setting),
1: Technology controller activated
x -
P2251 = 1 Technology controller mode
0: Technology controller as main setpoint (factory setting),
1: Technology controller as supplementary setpoint
x -
p2298 = … Technology controller minimum limiting
Parameter for the minimum limiting of the technology controller
x -
P2398 = … Energy-saving operating mode
0: Energy-saving mode inhibited (factory setting)
1: Energy-saving mode enabled
x x
P2390 = … Energy-saving mode start speed
0 (factory setting) … 21000 rpm. As soon as this speed is fallen below, the
energy-saving mode delay time starts and switches-off the motor once it
expires. The energy-saving mode start speed is calculated as follows:
Start speed = P1080 + p2390
P1080 = minimum speed
p2390 = energy-saving mode start speed.
x x
P2391 = … Energy-saving mode delay time
0 ... 3599 s (factory setting 120). The energy-saving mode delay time starts as
soon as the output frequency of the inverter drops below the energy-saving
mode start speed p2390. If the output frequency increases above this
threshold during the delay time, the energy-saving mode delay time is
interrupted. Otherwise, the motor is switched off after the delay time has
expired (if necessary, after a short boost).
x x
P2392 = … Energy-saving mode restart value (in %)
is required if the technology controller is used as the main setpoint.
As soon as the technology controller deviation (r2273) exceeds the energy-
saving mode restart value, the inverter switches to normal operation and the
motor starts with a setpoint of 1.05 * (p1080 + p2390). As soon as this value is
reached, the motor continues to operate with the setpoint of the technology
controller (r2260).
x -