Ac Power Supply - Kendrion EEX Series Operating Instructions Manual

Attention!
When fixing the cover (26) to the junction box (25), the M tightening torques for the socket head cap screws
A
specified in Table 15/1 must be strictly observed. The flat seal (9) and spring washer (28) must be installed as
shown in Fig. 9/1.
The input voltage is rectified by the built-in bridge rectifier. Depending on the brake size and torque, voltage
ripple due to intermittent power supply may cause humming or incorrect operation. Perfect operation must be
ensured by the user or system manufacturer by providing suitable electrical controls.

3.3.1 AC power supply

Direct brake connection 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 means that brake humming can 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 been
removed. The disconnection times remain unchanged.
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 bridge on the terminal block
(19) (see Fig. 11/2) must be replaced by the auxiliary contact. In case of DC side switching, AC side switching
is also required.
Operating Instructions BA 76..G..B00 // Last updated: 13/03/2020 // Page 12 of 34