Siemens SINAMICS G120 CU240E-2 - Specifying the Motor Speed Via the Fieldbus; Setpoint Calculation; Minimum Speed and Maximum Speed

Functions
7.5 Setpoint calculation
Inverter with CU240B-2 and CU240E-2 Control Units
166 Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
Table 7- 10 Parameters for the "Jog" function
Parameters Description
p1055 Signal source for jogging 1 - jog bit 0 (factory setting: 0)
If you wish to jog via a digital input, then set p1055 = 722.x
p1056 Signal source for jogging 2 - jog bit 1 (factory setting: 0)
If you wish to jog via a digital input, then set p1056 = 722.x
p1058 Jogging 1 speed setpoint (factory setting, 150 rpm)
p1059 Jogging 2 speed setpoint (factory setting, 150 rpm)
7.4.6 Specifying the motor speed via the fieldbus
If you enter the setpoint via a fieldbus, you must connect the inverter to a higher-level
control. For additional information, see chapter Connection to a fieldbus (Page 103).
7.5 Setpoint calculation
The setpoint calculation 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 7-4 Setpoint calculation 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.