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To browse Academia. Skip to main content. By using our site, you agree to our collection of information through the use of cookies. To learn more, view our Privacy Policy. Log In Sign Up. Adriana Moreno. The digital system measures the time devices in this field. It is also possible to From simple functions such as monitoring between two consecutive pulses and use 3-wire pnp sensors.

Mechanical speed of rotating shafts and gears, or compares it to a defined setpoint contacts should not be used due to sensing of turbine rotors, to entire reference value. This enables the device contact bounce and wear. NAMUR proximity sensors EN A wide range of devices with various The response of devices based upon the 6 feature a rugged and simple 2-wire design with speeds up to 5 kHz.

They are 2 2 functions are used to cover the complexity digital pulse principle is inherently very fast. NAMUR sensors may revolution more targets allows for a also be installed in hazardous areas when — rotational speed meters quicker response, because the preset used with an approved amplifier. This method provides motion detection. In most cases, the monitors with analogue output for very fast response times.

If only the shaft speed of a rotating machine part i. TURCK's or relays are not necessary. Response time synchronous operation The digital pulse-width measurement is not The response time of rotational speed Rotational speed monitors are available in suited for monitoring input frequencies monitors operating on the pulse principle modular housings type interfacemodul, which are close to zero speed.

Several devices Nevertheless, the digital pulse-width of the internal processing time of the de- with intrinsically safe input circuits are measurement is the only monitoring vice and the pulse period duration. Devices available for use in hazardous areas.

Devices with analogue output have a typical response time of ms to detect a speed devia- tion and provide the output signal if no steadying method is used. The pulse input pulse period duration of two Pulse indication has t to be added to the a. If the number of targets is increased, the analogue signal pulse period duration measuring time is shortened and thus it is possible to achieve relatively short response times in Fig.

For activated relay energised, transistor correctly. If an unacceptable deviation switching- be attenuated in a pre-defined order: first occurs, the output de-activates relay de- hysteresis one of the sensors is damped, then both output energised, transistor disabled. The respective 1 window function mode is either fixed or jumper 2 2 programmable or can be adjusted when This mode is a combination of underspeed assigning the device's parameters. If the input target frequency is within the defined range 1 A limit value flimit value must be defined and window of the setpoint, the system is set to distinguish between admissible and 2 operating correctly.

This mode enables unacceptable speeds. A switching selection of several parameters which are hysteresis is needed to cause the rotational explained in the respective data sheets. Setting of the limit value and window size This can be achieved by an especially of the switching hysteresis differs between shaped target. If the motion direction is output the three different basic designs and can be active detected, the respective relay is energised.

Further specifications can be taken from correct The following settings are available: speed operation the data sheets. Slip monitors evaluate the faulty system deviation in percent of both rotational Rotational speed meters convert the system operating speeds. If the deviation slip exceeds the measured speed value into a proportional operation correctly defined limit value, the output changes and standardised analogue current or output f inactive state.

Therefore, the In units designed for underspeed monito- start-up time delay function of the MSR For overspeed monitoring, some speed ring, it is possible to adjust a start-up device has been designed as a start-up monitors can be pre-programmed to delay time during which the output relays alarm.

This alarm is activated by means of steady the signal by forming a floating are forced to remain energised. This an auxiliary contact on the motor starter; average from a preset adjustment factor.

The start-up time delay is triggered by a This signal steadying function is especially potential-free contact auxiliary contact of the motor starter or by applying power Overrange protection useful when operating devices with analogue output current or voltage.

The 2 2 to the device. Speed monitors for overrange indication adjusted factor should match the number have an integrating filter incorporated into of targets per rotation. Any input frequencies in Input circuit monitoring excess of the upper threshold cannot be limit value processed by the speed monitoring device Many rotational speed monitors feature and the device indicates faulty system input circuit monitoring. If a short-circuit or operation. Input rates in excess of possible to monitor the current consump- output with system tion of the sensor.

If this value drops below start-up delay ok the threshold value are not detected. For safety reasons a speed monitor should only be operated within the specified operation range. Start-up alarm A start-up alarm is required in drive systems where an increase in speed could cause a faulty operation e. In units designed for underspeed monito- ring, it is not critical if input signals are not transmitted due to faulty control elements wire-break, short-circuit or incorrectly aligned sensors etc.

Non embed- The sensor-specific installation requirements dable unshielded units require larger are listed in the according sensor catalogues To achieve fast response times of the metal-free areas around the sensing switching distance, ambient conditions etc. It is essential to meet these requirements to per shaft revolution are transferred to the ensure correct operation. This method is not compatible with — The targets should be positioned devices equipped with a display for actual symmetrically to enable the speed When laying sensor cables, it is requested to speed indications.

There are several meter to provide a steady output observe the following guidelines: possibilities to achieve accordance by signal. Indication and of the analogue output, but cannot — prevent electro-magnetic interferences adjustment of limit values will then corres- compensate this effect completely.

Thus the sensor. When using a radially Guidelines for rotational speed mounted sensor it must be ensured monitoring via inductive sensors that the target is broad enough to attenuate the sensor sufficiently inspite When inductive proximity sensors are used of axial play. In case of radial play the as input devices, the following points same considerations should be taken should be observed contact TURCK for into account, even though radial play is more specific examples : lesser than axial play.

Different — The correction factors for non-ferrous mounting distances for radially and targets must also be considered see axially mounted sensors must be sensors catalogue. The closer the sensor operates to its limit frequency, the larger the safety distance between the targets and the larger the target should be.

The potential-free and external signal sources output relay i. The input pulse which can be configured as is indicated on the display. High speed monitoring is based on — four point controllers In low-speed applications, window function detection. Supply voltage UB The both relay outputs can be and supply voltage for Vrms programmed as a window function — a test voltage 2,5 kVrms combination of both. A predefined trigger event is Start-up time delay 0… s adjustable necessary to stop the write procedure, e.

A display located The potential-free pulse output provides however the device must be instal- on the front cover indicates the actual the input signal for additional processors. The input pulse a time window. In low-speed applications, detection plus window function is indicated on the display. Line monitoring for short-circuit implemented with four push buttons. The both relay outputs can be Supply voltage UB The transistor Galvanic isolation between input circuit an output circuit and supply output can also be used as a pulse divider.

The Start-up time delay 0… s adjustable recorded behaviour of the signal can be read out afterwards. Input circuits intrinsically safe acc. Thus one Both limit value relays S1 and S2 are moni- relay output can be used for alarm indica- tored by a separate dual colour LED. Insufficient the individual application. This makes the device 3 S1 3 S2 30 especially suitable for belt-drive and con- 0 AU 30 veyor belt monitoring.

To monitor slip, i. Monitoring range 0. In the NC mode the output relays are energised during the Galvanic isolation between input circuit, output circuit and selected start-up delay time to prevent supply voltage for Vrms, system shut-down due to an underspeed test voltage 2.

It has one relay tiometer which is accesible after removing detection output with two SPDT contacts. EN ranges.

Thus fault 0. When a detection applies only to the supply line. Start-up time delay 0. Below 0. The output relay is ener- Output circuits 1 relay output and 1 analogue output gised during the start-up time delay. If the pulse indication cease, the 3-wire pnp sensors and signal relays will de-energise after the time delay. The adjus- the direction of rotation changes.

The device is used to determine forward or reverse rotation of a system. It provides two relay outputs, each from the two sensor signals. Each delay At zero circuit, output circuit and supply speed both relays are de-energised. In case of a fault condition, both wire-break and short-circuit output relays de-energize automatically.

During a mal- front of the device. Wire-break or short-circuit conditions on the output of the sensor Supply voltage U B Line frequency AC Speed range 0. A yellow LED indicates the status of the Clearences and creepage distances output relay.

Then the switch point principle. This method provides a fast plated contacts is adjusted by means of the front panel response and is ideal for applications with potentiometer.



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Rotational speed monitor im21-14-cdtri - Clearwater Technologies ...

Rotational speed monitor imcdtri - Clearwater Technologies Clearwater Tech - Phone: A display located on the front cover indicates the actual value. The switching status of the correspondent output relay i.





Turck IM21-14-CDTRi Rotation Speed Monitor -


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