Counting Technology - KÜBLER - (Version JPG) - Page n° 9 - PDF Catalogue | Technical Documentation

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General Data and Instructions				(sàibler

2.3 Pulse(enerator Appropriate pulse generators are required in order to achieve accurate count results. In this connection, it should be ensured that these oper-ate as far as possible without bounce; this is par-ticularly important for counters with high pulse rate. Cam operated spring contacts, limit switch- 2.4 Electrical Reset Counters with electrical reset have an electro-magnet which is operated by a reset pulse, and resets the number wheels back to the starting number. The predetermining counters have a release mechanism which is additionally ten-sioned. The pre-determining counters can be reset either by remote pulse or automatically. On remote reset through pulse, the pulse dura-tion must be long enough for the reset operation 2.5 Spark Quenching If the pulse contact is within the DC circuit of the counter, spark quenching is necessary in order to avoid any contact disturbance from the induc-		es and microswitches are suitable for count speeds up to approx. 10 or 25/cps, small relay contacts up to approx. 40 cps, higher count speed up to 60/cps. can be achieved with reed switches, exact matching of spark quenching being necessary to avoid premature sticking of to be completed and for the minimum pulse dura-tion to be maintained in accordance with the technical data of the counters. It is essential that during resetting no pulses may pass into the count mechanism, as otherwise intermediate positions of the number wheel or slippage of the drive mechanism can occur. There is no danger of mechanical damage of the counter, however. In order to avoid mistakes, the count pulses tive breaking voltage. Unfortunately, however, a more or less strong dropout delay is produced by the spark quenching and it should be checked in This spark quenching produces practically no disturbing dropout delay and is, therefore most suitable for all count speeds. It should preferably be used at very high count speeds. In general the RC element is located in parallel with the Considerable dropout delay, therefore only suitable for low count speeds up to 10 cps. Particu-lar attention should be paid to the correct polari-ty on connecting. The small fitting size is an		contact reeds. Even higher speeds can be obtained by using photoelectric or inductive sen-sors. Our pulse generators which are manufac-tured in a robust and solid style are suitable for count speeds up to maximum of 60/cps.		a> 0} CD a> 'E 0} > o
				should only be allowed to enter, when the num-ber wheels have been accurately adjusted and the drive mechanism is fully engaged. On remote reset a count interval of at least 50 ms after pulse end is required and thus the total count interval = reset pulse time + 50 msec. On counters with automatic reset the count interval must be adhered to according to the technical specifications. any case whether this will cause disturbance.
				contact in order to produce high frequency interference suppression at the same time. How-ever, it can also be connected in parallel with the coil. We supply RC elements for any voltage and count speed. advantage: e.g. this type of spark quenching can be used for resetting coils.
2.5.2 Spark quenching with Diodes


2.5.3 Spark Quenching with Zener Diodes

Low dropout delay, therefore suitable for higher count speeds because the diode only passes the inductive breaking current when the Zener voltage is achieved. It is also suitable for the				protection of transistor circuits, where correct polarity also necessary.

2.5.4 Spark Quenching with Varistors

		Varistors are voltage dependent resistors whose resistance decreases inertialessly and exponen-tially with rising voltage. They are therefore, suitable for spark quenching, the varistor ideally being connected in parallel with the coil. It is		rated for the current to be approx. 1/10 of the coil current at nominal voltage.

2.5.5 Identification of counter model The design of the pulse counters is identified according to type series, version of front panel, e.g.		and reset, according to the following system:		Some products are (ULIMerwritoi certified:

		BIS. 1
Type series Front panel Reset	T

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Counting Technology - KÜBLER - #9

Transceiver, Absolute encoder, Converter, Controller, Serial converter