Dc Side Switching; Dc And Ac Current Switching; Protective Earth; Figure 12: Connection For Dc Side Switching - KEB COMBISTOP 28 Installation Manual

ELEcTrIcAL cONNEcTION

5.1.2 Dc Side Switching

Switching occurs between rectifier and brake. KEB rectifiers and power boxes are pro-
tected against voltage peaks occurring during switching.
Figure 12:

5.1.3 Dc and Ac current switching

Figure 13:

5.1.4 Protective earth

The brake has no PE connection. The required low-resistance connection must be
made via the metal fastening to the grounded motor housing. If necessary, this must be
checked by a measurement. Additionally the brake is usually covered by the installed
fan cover and therefore cannot be touched directly.
32
Connection for DC side switching
Connection for DC and AC side switching
► Not suitable for inverter operation
since the powerbox or rectifier would
be destroyed.
► Inverter operation possible because
the powerbox or rectifier is supplied
by the mains.
► For inverter operation, switch the
switch during start-up via the digital
output.
► Shortest disconnecting times
► Reduces the contact erosion