Datasheet

3
Date of issue 2003-07-23 035742_ENG.xml
KHU8-DW-1.DRotational speed controller
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany [phone] • USA [phone] • Singapore [phone] • Internet http://www.pepperl-fuchs.com
Device description
The KHU8-DW-1.D Speed Monitor is a device for the indication and monitoring of periodic signals, which occur in almost all areas of au-
tomation and process technology, i. e. of frequencies in general and rotational speeds in special cases. The input signals are evaluated in ac-
cordance with the cycle method, i. e. by measurement of the period of oscillation and conversion into frequency or rotational speed by a very
fast m 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 1/min. It is also possible, in applications involving slow processes, in which the signal sen-
sors 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 decimal point.
The monitoring function is achieved on the basis of a limit value, whose upper and lower hysteresis value is freely selectable within the re-
spective 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 ca-
pability, the relay output can be used for the direct activation of an actuating element or as an input signal for a higher level control sys-
tem.
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).
Terminal assignment
T. 1: Signal sensor supply GND
T. 2: Trigger input for start-up override
T. 3: Signal sensor supply +24 V DC
T. 4: Power supply + 24 V DC
T. 5: Power supply GND
T. 6: Not connected.
T. 7: Signal sensor supply GND
T. 8: NAMUR input L-
T. 9: NAMUR input L+
T. 10: Relay make contact, NO
T. 11: Relay break contact, NC
T. 12: Relay root, COM
T. 13: Signal sensor supply +24 V DC
T. 14: Signal sensor NPN input
T. 15: Signal sensor PNP input
T. 16: Power supply L1, 230 V AC
T. 17: Power supply L1, 115 V AC
T. 18: Power supply N
Notes