PA SDI-Drives Midi Manual
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PA SDI-Drives Midi™ / Maxi™ Edition 07.44 Power Automation2.3.2 Principle of OperationThe function “safe restart lock“ uses three digital inputs, to bring the drive in this state.• ENABLE – input• LOCK – input• EN-BRAKE – inputedardware for about 0.5sec. After this time, the inputs force the drive in the safe state.The ENABLE – input inhibits the control signals of the power stage.-stage. This is the second path to switch off the control signals of the power stage.-the axes, the enable input has to be set to “high” to be able to enable the drives.combined in or – logicutput1/S2 is closed and symbolises the state “safe restart lock” after about 0.6 sec.N = 1 or the corresponding bit inthe control word) has to be set to enable the power stage.All three signals have to be open or low, to enable the “safe restart lock” function. Tosimplify the external emergency stop circuitry in the cabinet, the three inputs disable thedrive directly via microcontroller. The microcontroller decelerates the motor to zero speand disables the power stage. In parallel, the three inputs are switched-off delayed byh-The LOCK – input switches off the supply voltage of the drivers of the IGBT powerThe EN-BRAKE – input switches the 24V supply of the holding brake off. Thisinput can be set to high to release the holding brake for manual move of themechanics (in combination with K-BRAKE = 1) without loosing the safe restartlock of the power stage. Even if no holding brake is connected to one or more ofThe state of the supply voltage (on/off) of the drivers is fed back andwith the internal ENABLE signal and the internal EN-BRAKE signal.Only if the three signals are in the safe state, the “SAFE LOCK” relay contact of oSWhen the inputs LOCK, ENABLE and EN-BRAKE are switched to high, the drive is notenabled directly. In addition to that, a software enable (K-ELOCK or ENABLEor EN-BRAKE„SAFE“ Relay Output(High = Contact ClosedInternal EnableSoftware EnableSpeed Set Pointfrom ControllerActual Speed0.6 sec0.1 secG-EMRAMPBack to ContentsSDI Interface Manual 7 |
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