Electrical Connection; Connecting The Brake With Rectifier - KEB COMBISTOP Instruction Manual

Installation

5.4 Electrical Connection

The COMBISTOP type 38 brake is delivered with factory-preassembled connecting
cables and a factory-set microswitch (if ordered) for brake engagement monitoring. The
signals ON/Off and Brake Open/Closed are evaluated by the customer.
DANGER
NOTICE
The COMBISTOP type 38 brake must be powered by a nominal DC voltage. If such a
voltage is not available, an AC to DC rectifier is available for purchase from KEB
America, Inc.
The nominal DC voltage can be found on the name plate of the device as well as in
Appendix B: Technical Specifications.
Refer to the sections below for installing an AC to DC rectifier. For brakes with rectifiers,
the brake can be switched on or off on the AC or DC side of the rectifier. AC side
switching offers reduced wear on the relay switching contacts but slower brake
engagement time. DC side switching requires a contactor to support the high voltages
which are present during switch off, resulting in increased contactor wear but significantly
faster engagement time.
NOTICE
5.4.1

Connecting the Brake with Rectifier

To connect the brake to an AC voltage source, a rectifier must be installed upstream of
the brake. For more details on KEB rectifiers, refer to the COMBITRON rectifier manuals.
28
Risk of electrical shock!
 Before each start-up of the system, check electrical equipment for
visible defects such as loose connections or damaged insulation.
 Have an electrician remedy any defects before powering on the
brake.
Risk of Damage to Brake!
 Before connecting the electrical equipment check the available
supply voltage and verify it is within the nominal DC voltage for the
brake.
 Powering the brake outside of the nominal DC voltage will damage
the brake.
Risk of Damage to Brake!
 When switching off the brake on the DC side, excessive voltages will
occur. These voltages may damage the brake coil and the switching
contact if the contact is not adequately protected.
 KEB Rectifiers offer internal protection. Additionally, external MOVs
can be used to limit the voltage. Contact KEB America for further
information.
The complete manual for COMBITRON rectifiers
can be found at https://www.kebamerica.com
COMBITRON Rectifier Manual at
https://www.kebamerica.com
2021 KEB America, Inc.
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