Speed and Direction Monitors 124.1S2
with direction signal contact,
analog output, alarm contact, display

19-inch Module ( E )

Panel Mount Version ( C )

Snap-on-track version ( D )

Application Characteristics

• For all applications where the sense of motion is a critical factor: feeding pumps, the turn gear of a turbine, the automatic testing equipment for electric hand tools, for instance.

• Evaluating the electronic output signals from a sensor of series A5S30 ...A5S33 (which unifies speed and direction detection in one sensor), to provide:

• a direction signal SPDT contact with programmable response,

• a speed setpoint alarm SPDT contact (convertible to a parallel operating direction signal,

• a programmable linear analog speed output 20 ma / 10 v,

• a digital speed and direction display.

Direction Signal
The unit not only converts the immediate electronic direction signal from the sensor to an isolated relay SPDT signal. For this assignment, it offers a programmable selection of definitions:

• Motion controlled delay of the reverse signal:

  The reverse condition will not be released until a (programmable) number of pulses in reverse direction has occurred, within a (programmable) period of time. Thus, a slight reverse motion or oscillation at the machine stop will not result in an unwanted reverse signal. It will not be released, before the machines resumes a certain reverse speed. The "forward" signal however will appear without delay after one pulse in forward sense.

• Attachment to zero speed:

  Per program, the direction signal may alternatively be tied to a zero speed status, which is detected at a designated level (see speed measurement). The thus enforced signal can be programmed to be forward or reverse.

• Double pole contact signal:

  The second relay output of the unit, normally assigned to a setpoint controlled speed alarm, may be joined to the direction section per program. A double poled relay signal thus is achieved, useful for instance, to reverse the analog speed signal provided.

   

Direction signal output:
With standard (default) programming, one relay signals the direction by its SPDT contact, following one of the above criteria. Per program, the relay position at no power can be assigned to forward or reverse motion. 
If required, the second relay output of the unit, normally assigned to a programmable speed alarm, may be joined to the direction section per program. Thereby, a twin circuits SPDT signal is achieved, useful for instance, to reverse the analog speed signal provided.

Power handling facility of each SPDT contact:

max 250 v/2 amp AC resp. 100 watts DC. External overload protection required.

Compatibility to Standards

EMI according to  EN 610000-6.2, EN 610000..-6.4,

Safety according to EN 61010-1

Speed Measurement
This section utilizes the pulse train, as additionally provided by the A5S30 ..33 sensors. It uses the advantageous measuring principle, distinguished by quartz controlled pulse distance evaluation, automatically extended over a programmable minimum period of time. The ideal combination of fast response and averaging of measurements, as appropriate to the application.
By the  5-digits scaling facility, any required reading can be established.
Measuring accuracy ± 0.01 %  ± 1 in last significant digit.
Minimum time extension for every measuring period programmable 30 millisec up to 10 seconds.
The programmable low end of the speed range determines the aforementioned zero speed criterion selectable for the direction signal.

Speed Setpoint Alarm
Output with SPDT relay contact. Response characteristics individually programmable: setpoint, hysteresis bandwidth and location, condition at no power and during starter period.
Response delay approx. 5 millisec + measuring period.
Power handling max 250 v/2 amp AC resp. 100 watts DC, overload protection required.

Display
5 digit, with bright red figures. Versions C and D have 14 mm height, version E uses 8 mm. Decimals and blank zeroes can be programmed. The display update sequence may be increased beyond the minimum period.
During the programming phase, the display reads the step number and its corresponding parameter.

Direction indicated by a red LED on/off.

Sensor Input
Compatible with any sensor of series A5S30....A5S33, including its supply.
Likewise, the unit can operate with corresponding signals from a sensor of series A5S14... A5S17 installed in a hazardous Ex-area, if transmitted via an Isolating Barrier D461.21.

Other sources, if used, must provide the same signals: a pulse train signal with its frequency representing the speed and a binary signal indicating forward/reverse, both  with hi/lo level >+7/<+4 v, into an input impedance of 100 kohms.
Frequency range 0 - 100 kHz.

Power Supply Options

18...40 volts AC/DC  (suffix U1 to model No)
85..265 volts AC/DC (suffix U2 to model No)

Power consumption approx 5 VA.

Operating Conditions

Ambient temperature  0°C ... +50 °C (30 ...95 °F).

Optionally, the snap-on-track version (D) is available with extended temperature range -25 ... + 65 °C (suffix M to model No).

Humidity max 70%, without condensation.

Insulation Category I

Design versions

Various design versions are available, with identical functional characteristics.

Panel mount version ( C ):

Front frame 96x48 mm, protection grade IP50. Plastics enclosure, depth 125 mm, mounting by supplied brackets. Panel thickness up to 10 mm, opening 92x45 mm. Weight approx. 200 grams. Rear side terminals for wire up to 2.5 mm², protection grade IP20.

Snap-on-track version ( D ):

For DIN rail 35 mm. Plastics enclosure, protection grade IP50. Terminals for wire gage up to 2.5 mm², protection grade IP20. Length 100 mm, width 75 mm, height 111 mm. Weight approx. 200 grams.
19-inch module ( E ):
For rack height 3HE (132 mm). Front width 8TE (44 mm). Weight approx. 100 grams. Rear side connector according to DIN 41612, size F, lines b + z.   Plug-in socket as extra available.