Conveyor drive unit (1a; 1b) for driving a conveyor comprising: a motor; an adaptive power supply unit configured for supplying electrical energy to the motor; a safety chain/circuit comprising at least one safety device (32, 34, 36) and being configured for ensuring a safe operation of the conveyor; and an initialization switch (28a; 28b), which is configured for selectively connecting the adaptive power supply unit electrically with the motor for initialization of the adaptive power supply unit without bypassing or deactivating the safety chain/circuit, wherein the conveyor drive unit (1a; 1b) further comprises a motor control unit which is configured for controlling the motor by providing electrical power Z from the adaptive power supply unit with variable voltage and/or variable frequency for driving the motor, wherein the input side of said motor control unit is electrically connected to an outlet side of the adaptive power supply unit; characterized in that the initialization switch (28a; 28b) is configured for supplying a signal to the motor control unit, when activated, which causes the motor control unit to electrically connect the adaptive power supply unit electrically with the motor although no drive signal is provided from the operational control unit; and the initialization switch (28a; 28b) is further configured for supplying a signal to the safety chain/circuit indicating that the motor is intended not to move more than a predetermined amount during the initialization. a motor; an adaptive power supply unit configured for supplying electrical energy to the motor; a safety chain/circuit comprising at least one safety device (32, 34, 36) and being configured for ensuring a safe operation of the conveyor; and an initialization switch (28a; 28b), which is configured for selectively connecting the adaptive power supply unit electrically with the motor for initialization of the adaptive power supply unit without bypassing or deactivating the safety chain/circuit, wherein the conveyor drive unit (1a; 1b) further comprises a motor control unit which is configured for controlling the motor by providing electrical power Z from the adaptive power supply unit with variable voltage and/or variable frequency for driving the motor, wherein the input side of said motor control unit is electrically connected to an outlet side of the adaptive power supply unit; characterized in that the initialization switch (28a; 28b) is configured for supplying a signal to the motor control unit, when activated, which causes the motor control unit to electrically connect the adaptive power supply unit electrically with the motor although no drive signal is provided from the operational control unit; and the initialization switch (28a; 28b) is further configured for supplying a signal to the safety chain/circuit indicating that the motor is intended not to move more than a predetermined amount during the initialization. selectively connecting the adaptive power supply unit electrically with the motor for initialization of the adaptive power supply unit without bypassing or deactivating the safety chain/circuit, wherein the conveyor drive unit (1a; 1b) further comprises a motor control unit which is configured for controlling the motor by providing electrical power Z from the adaptive power supply unit with variable voltage and/or variable frequency for driving the motor, wherein the input side of said motor control unit is electrically connected to an outlet side of the adaptive power supply unit; characterized in that the initialization switch (28a; 28b) is configured for supplying a signal to the motor control unit, when activated, which causes the motor control unit to electrically connect the adaptive power supply unit electrically with the motor although no drive signal is provided from the operational control unit; and the initialization switch (28a; 28b) is further configured for supplying a signal to the safety chain/circuit indicating that the motor is intended not to move more than a predetermined amount during the initialization.