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Functions
7.5 Setpoint calculation
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
202
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
7.5
Setpoint calculation
The setpoint processing modifies the speed setpoint, e.g. it limits the setpoint to a maximum
and minimum value and using the ramp-function generator prevents the motor from
executing speed steps.
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Figure 7-10 Setpoint processing in the inverter
7.5.1
Minimum speed and maximum speed
The speed setpoint is limited by both the minimum and maximum speed.
When the motor is switched on, it accelerates to the minimum speed regardless of the speed
setpoint. The set parameter value applies to both directions of rotation. Beyond its limiting
function, the minimum speed serves as a reference value for a series of monitoring
functions.
The speed setpoint is limited to the maximum speed in both directions of rotation. The
inverter generates a message (fault or alarm) when the maximum speed is exceeded.
The maximum speed also acts as an important reference value for various functions (e.g. the
ramp-function generator).
Table 7- 24 Parameters for minimum and maximum speed
Parameter
Description
P1080
Minimum speed
P1082
Maximum speed
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