Rotation Speed Monitor KFU8-DW-1.D
The KFU8-DW-1.D Speed Monitor is a device for the indication and monitoring of periodic signals, which occur in almost all areas of
automation and process technology, i. e. of frequencies in general and rotational speeds in special cases. The input signals are evaluated in
accordance with the cycle method, i. e. by measurement of the period of oscillation and conversion into frequency or rotational speed by a very
fast µ controller.
The frequently occurring special case of rotational speed measurement has been paid particular attention in the development of the device. Thus
indication and input can be either in Hz or in rpm. It is also possible, in applications involving slow processes, in which the signal sensors
provide many pulses per revolution, to operate automatically with the actual rotational speed of the drive by specifying the number of
pulses per revolution.
The indication of the measured value is provided on a 4-digit, 7-segment LED display on the front of the device, with up to 3 places after the
The monitoring function is achieved on the basis of a limit value, whose upper and lower hysteresis value is freely selectable within the
respective display range.
The output signal is generated by a relay with a changeover contact, when the hysteresis limits are violated. Thanks to a high switching
capability, the relay output can be used for the direct activation of an actuating element or as an input signal for a higher level control
Also, the switching status of the relay is indicated by means of a yellow LED on the front of the device.
A function block is connected in series with the relay, which 10 provides for various timer functions and thus obviates the requirement for the
subsequent addition of a timer relay. In addition to the pull-in and drop-out delay, passing make contact and and pulse extension, the
direction of operation of the relay, i. e. monitoring of speed fluctuation about a nominal value, can also be selected.
The built-in start-up override, initiated when the power supply is switched on, or by an external signal, prevents error signals during the
running up of the monitored system.
The speed monitor can be supplied with 115 V AC, 230 V AC or by a 24 V DC supply and when connected to an alternating voltage it provides
a 24 V DC source to supply the signal sensor.
All current two, three and four-wire proximity switches and incremental encoders can be accepted as the signal sensor.In addition, two
terminals are reserved for the connection of proximity switches in accordance with DIN 19234 (NAMUR).