Omega DRST-FR, Руководство пользователя

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8
In general
5
Section - Programmable f/I - f/f Converter DRST-FR
• Pulse calculator
• Frequency generator
• Galvanic isolation, optional ATEX Ex
• Analogue current and voltage output
• PNP / NPN output, optional relays
• Universal supply
Supply voltage: 24...250 VDC
24...230 VAC
INPUT RANGE:
Frequency: 0...20000 Hz
Sensor types: Namur, tacho,
NPN, PNP, TTL, S0
OUTPUT RANGE:
Current and voltage output: 0...20 mA / 0...10 V
Relay outputs: 0...20 Hz
NPN and PNP output as f/f: 0...1000 Hz
NPN and PNP output as generator: 0...20000 Hz
Section 5 - In general
By way of a standard PC and the Loop Link programming kit, the OMset Software with
DRST-FR f/I - f/f converter is configured acc. to the requested function.
Alternatively, the DRST-FR may be delivered fully-configured acc. to your specifications, see the
options index in the data sheet. Typical pulse sources are flow meters, tacho generators, mechanical
switches, or inductive proximity sensors.
Section 6 - Applications
The f/I function performs frequency to current and voltage conversion. The output can be
programmed to show period, meaning that the input frequency can be converted to a linear time
signal. The digital outputs are used as e.g. a frequency watch for speed control or as a window
comparator having one status between 2 limits and the opposite status outside these limits.
The f/f function can be used for pulse division or multiplication and as a buffer collecting fast pulse
trains. The input pulses are calculated, counted in a buffer, and sent to the output as a pulse train with
the programmed pulse width. A scale factor may be entered in all functions. Using both digital inputs,
pulse addition or subtraction are possible. This function permits readout of the actual consumption at
measurement of e.g. liquid flows forward and backward.
The frequency generator function is used as e.g. a time base or clockgenerator.
The 2-phase encoder, or directional f/I conversion, converts 2 90°-phased digital inputs to an analogue
speed signal with digital output for directional indica tion.
ATEX Ex units have input for mechanical contact and NAMUR inductive proximity sensor.