Function Diagrams; Bypass Function - Siemens SINAMICS S150 NEMA Operating Instructions Manual

Function diagrams

FD 7950
FP 7951
FD 7954
FD 7958
Key control parameters
• p1155 = r2294 CI: Speed controller speed setpoint 1 [FP 3080]
• p2253 = r2224 Technology controller setpoint effective via fixed setpoint [FD 7950]
• p2263 = 1
• p2264 = r4055 Actual value signal X
• p2280 = Kp
• p2285 = Tn
• p2200 = 1
9.4.2

Bypass function

The bypass function uses digital drive outputs to activate two contactors and uses digital
inputs to evaluate the contactor's feedback (e.g., via TM31). This circuit allows the motor to
be operated using the converter or directly on the supply line. The contactors are activated
by the converter. The feedback signals for the contactor positions have to be returned to the
converter.
The bypass circuit can be implemented in two ways:
● without synchronizing the motor to the line supply
● with synchronizing the motor to the supply.
The following applies to all bypass versions:
● The bypass switch is also always shut down if one of the "OFF2" or "OFF3" control word
signals is canceled (motor coasts down). When "OFF1" is withdrawn, the motor remains
connected to the line supply.
● Exception:
If necessary, the bypass switch can be interlocked by a higher-level controller such that
the drive can be shut down completely (i.e. including the controller electronics) while the
motor is operated on the supply.
The protective interlocking must be implemented on the system side.
● When the drive is started up again after POWER ON, the status of the bypass contactors
is evaluated. After powering up, the converter can thereby change straight into "Ready to
start and bypass" status. This is only possible if the bypass is activated via a control
signal, the control signal (p1266) is still present once the system has been ramped up,
and the "automatic restart" function is active (p1210 = 4).
Enclosed Drives
Operating Instructions, 12/2018, A5E36652151A
Technology controller – fixed values, binary selection
Technology controller – fixed values, direct selection
Technology controller – motorized potentiometer
Technology controller – closed-loop controller
D component in fault signal [FD 7958]
actual
Calculate P gain by means of optimization
Calculate integral time by means of optimization
Technology controller enabled
Functions, monitoring and protective functions
via AI0 of TM31 [FP 9566]
9.4 Extended functions
611