Product Description
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3 Product Description
3.1 Scope of this Manual
This manual describes the installation and function of the KEB Brake Transistor Monitor.
• Model Number : 00F5090-BTW9
3.2 Overview
The KEB Brake Transistor Monitor is designed to monitor the status and health of the
Brake transistor of the connected AC drive.
Brake transistors are generally robust and appropriately sized for loads in excess of
continuous duty. However, certain external conditions (environment, voltage supply, etc.)
may lead to failure of the Brake transistor. In the event of Brake transistor failure with a
short circuit, a continuous current can flow to the Brake resistor. Brake resistors are often
sized for intermittent duty of the drive (the normal use case) and are not rated to
withstand continuous operation.
Continuous current can cause the resistor to overheat and potentially
catch fire resulting in damage to the equipment or dangerous safety
hazards.
The KEB Brake Transistor Monitor is specifically designed to check whether or not the
Brake transistor has short circuited, and if so to disengage the Brake resistor by one of
two methods. The Brake Transistor Monitor checks whether the output voltage from the
Brake transistor switches off at least once in a 64mSec period. If the Brake transistor
output remains on for longer than this time, the Monitor detects a failure and opens a
normally-closed pilot contact (K1/K2) which can be used to disconnect the current to the
Brake resistor. The current can be disconnected either on the AC line feeding into the
drive, or the DC connection to the Brake resistor.
3.3 Defined Use
The KEB Brake Transistor Monitor is designed for use with KEB COMBIVERT F5 AC
motor controls. Use with other third party motor controls is beyond the specific application
of the Brake Transistor Monitor. Consult KEB for further information.
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