Functions, monitoring, and protective functions
9.3 Extended functions
Inverter chassis units
454 Operating Instructions, 07/2016, A5E00331449A
Device damage due to phase shift in the bypass circuit
Changing the phase sequence or the direction of rotation using p1820/p1821, without
physically adapting the phase cables results in incorrect synchronization, which can result
in mechanical damage to the plant.
• Ensure that no different phase sequence occurs in the bypass circuit between line
operation and converter operation.
• If you change the direction of rotation via p1820/p1821, adapt the phase lines
accordingly.
The bypass function is only possible for encoderless closed-loop speed control (p1300 = 20)
or V/f control (p1300 = 0...19) and when an induction motor is used.
Establishing the bypass function
The bypass function is part of the "technology controller" function module that can be
activated by running the commissioning Wizard. Parameter r0108.16 indicates whether the
function module has been activated.
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