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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.
►
Not suitable for inverter operation
since the powerbox or rectifier would
be destroyed.
Figure 12: Connection for DC side switching
5.1.3 Dc and Ac current switching
►
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
Figure 13: Connection for DC and AC side switching
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.
Summary of Contents for COMBISTOP 28
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