Ac Power Supply - Kendrion 76..P..B00 Series Operating Instructions Manual

3.3.1 AC power supply

Direct connection of the spring-applied single-disc brake to an AC power source is only possible if a rectifier
is used. Wiring of the brake in case of single-phase AC power supply must be performed in the same way as
with three-phase voltage. The coupling times vary depending on the switching type (DC side switching or AC
side switching).
Bridge rectification:
Bridge rectifiers provide voltage with minimum residual ripple. This allows brake humming to be avoided
even if small size brakes are used. In case of bridge rectification, the U coil voltage is lower by factor 0.89
2
than the rectifier input voltage.
AC side switching:
In case of AC side switching, the switching contact for the spring-applied single-disc brake is provided on the
AC voltage side directly before the bridge rectifier. It must be considered, however, that the bridge rectifier
with its free-wheel diode may extend the coupling time significantly (by factor 5 or over) after AC voltage has
DC side switching:
In case of DC side brake switching, an auxiliary contact is provided on the brake contactor, for example. This
auxiliary contact is designed to interrupt the power supply on the DC side. The jumper on the connecting
terminal (19) (see Fig. 9/2) must be replaced by the auxiliary contact. In case of DC side switching, AC side
switching is also required.
Kendrion Binder Magnete GmbH Operating Instructions 76 ..P..B00 Last updated: 30 Dec. 2009 Page 10