VibroSystM DMV-100, Руководство по установке

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46 DMV-100 Rotor Creep and Speed Detector - Installation Manual
5.4.2.4 Additional information on parameters
I
NITIAL SETTING PARAMETERS
•
Function
Six types of function are available to specify how speed and other calculations will be performed. In the
DMV-100 application, function
F1 is needed. For reference only, the functions are:
- F1 (RPM/circumferential speed): displays rotation (RPM) or circumferential speed for one input
- F2 (Absolute ratio): displays calculation result for two rotation (RPM) speeds
- F3 (Error ratio): displays calculation result for two rotation (RPM) speeds
- F4 (Rotational difference): displays calculation result for two rotation (RPM) speeds
- F5 (Flow rate ratio): displays calculation result for two rotation (RPM) speeds
- F6 (Passing time): displays the passing time calculated from the circumferential speed and the length
of the processing stage for one input
•
Input type
Four types of input signals can be specified. In the DMV-100 application, type 00 is required. For
reference only, the input types are:
- No-voltage contact (30-Hz max. with ON/OFF pulse width of 15 ms min.);
- Voltage pulse (50-kHz max. with ON/OFF pulse width of 9

s min.; ON voltage: 4.5 to 30V; OFF
voltage: -30 to -2 V; input impedance: 10 k


- Open collector (50-kHz max. with ON/OFF pulse width of 9

s min.)
NO: Voltage pulse high NC: Voltage pulse low
No-contact or voltage
pulse input
00 01
Contact 10 11
•
Prescaling value X (mantissa)
•
Prescaling value Y (exponent)
To make calculations using the input pulse to display rotation (RPM), the number of pulses per rotation
must be converted into a coefficient, called the

prescale value. In the DMV-100 application, the
number of pulses per rotation corresponds to the number of poles on the rotor.
Rotation speed (RPM) = f x 60 X

f: Input pulse frequency (No. of pulses per second)

: Prescale value
Ex.:
If there are 80 poles on the rotor, then:

= 1/80 (=0.0125)
Prescaling value X (mantissa) = 1.25
Prescaling value Y (exponent) = 10
-2