SAMI G S 3 General Information About SAMI GS The DC-Intermediate Circuit filters the pulsating DC-voltage supplied by the Rectifier Stage. A Control Interface Card is the link between the operator and the SAMI. It incorporates a control panel with an alphanumeric display and keypad. A terminal block for external control connections is also located on the Control Interface Card. Thanks to the diode bridge, the power taken from the mains is almost entirely active power. The power factor approaches unity. Note! The Control Interface Card is galvanically isolated from the mains potential. The card is connected to earth via a 10 M Ω resistance.
If needed the card can be earthed by connect- ing with a wire X50 terminal 8 to PE terminal on the unit frame (see Figure 6-1). The Inverter Stage forms symmetrical three- phase AC-voltage from the constant DC- voltage supplied by the DC-Intermediate Circuit. A Motor Control Card controls the Inverter Stage and monitors the operation of the SAMI GS. Note! The maximum permissible number of charges within one minute is four. Therefore in applications where frequent sequential Start/ Stops are required, electronic Start/Stop should be used, while the unit is powered continuously. 8