H7CC-R11D datasheet(34/66 Pages) OMRON

34 / 66 page

H7CC-A

tachometer

Explanation of Functions

Tachometer Operation

Tachometer Input Mode (tinm)

Set the count input mode to one of the following: 1 input (F1), 2 inputs

(F2), error (F3), absolute ratio (F4), or error ratio (F5).

Tachometer Output Mode (totm)

Set the output method for control output based on the comparison

value. Upper and lower limit (HI-LO), area (AREA), upper limit (HI-HI),

and lower limit (LO-LO) can be set.

(For details on the output modes, refer to Output Mode Settings and

Operation

on page 38.)

Counting Speed (cnts)

Set the maximum counting speed (30 Hz/10 kHz) for CP1 input.

If contacts are used for input signals, set the counting speed to 30 Hz.

Processing to eliminate chattering is performed for this setting.

Decimal Point Position (dp)

Decide the decimal point position for the measurement value, OUT1

set value, and OUT2 set value.

Prescale Value (pscl)

It is possible to display the rate of rotation or the speed of a device or

machine to which the H7CC is mounted by converting input pulses to

a desired unit.

If this prescaling function is not used, the input frequency (Hz) will be

displayed.

It is also possible to specify time (seconds) as the display value. Refer

to Display Unit on page 35 for details.

The relationship between display and input is determined by the

following equation. Set the prescale value according to the unit to be

displayed.

Displayed value = f

× α

f: Input pulse frequency (number of pulses in 1 second)

α: Prescale value

(1) Displaying Rotation Rate

N: Number of pulses per revolution

Example: To display the rate of rotation for a machine that outputs 5

pulses per revolution in the form

@@.@ rpm:

1. Set the decimal point position to 1 decimal places.

2. Using the formula, set the prescale value (

α) to 1/N × 60 = 60/5 = 12.

(2) Displaying Speed

N: Number of pulses per revolution

d: Diameter of rotating body (m)

πd: Circumference (m)

• Observe the following points when setting a prescale value.

Set the set value to a value less than {Maximum countable value

−

Prescale value}.

Example: If the prescale value is 1.25 and the counting range is

0.000 to 999.999, set the set value to a value less than 998.749 (=

999.999

− 1.25).

If the set value is set to a value greater than this, output will not turn

ON.

• Output will turn ON, however, if a present value overflow occurs

(FFFFFF}.

Averaging Method (avgt)

A simple average or moving average can be selected for the

averaging. With the moving average method, the average of the

measurement values is displayed each sampling cycle, in contrast to

a simple average, with which the the average of the set number of

samples is displayed.

Number of Averaging Times (avgn)

Flickering display and output chattering can be prevented using

average processing. Average processing can be set to one of four

levels: no average processing, 2 times (i.e., the average of 2

measurement values), 4 times, 8 times, or 16 times.

The measurement cycle will be equal to the sampling cycle multiplied

by the average processing setting (i.e., the number of times).

Average processing enables stable displays even for fluctuating input

signals. Set the optimum number of times for the application.

Auto-zero Time (auto0)

The display can be force-set to 0 if there is no pulse for a certain

period of time. This time is called the auto-zero time. Set the auto-zero

time to a time slightly longer than the estimated interval between input

pulses. Accurate measurement is not possible if the auto-zero time is

set to a time shorter than the input pulse cycle. Setting a time that is

too long may also result in problems, such as a time-lag between

rotation stopping and the alarm turning ON. The auto-zero time is not

applied to pulse width measurements.

Input

mode

Input

Internal

processing

Application

1 input

Count 1

None

Operation with only one input.

2 inputs

Counts 1 and 2 None

Operation with two

independent inputs.

Error

Counts 1 and 2

Count 1 input

−

Count 2 input

Measuring the difference

between two inputs (error in

number of revolutions).

Absolute

ratio

Counts 1 and 2

Count 1 input

Count 2 input

Measuring the ratio of two

inputs (ratio of number of

revolutions).

Error ratio Counts 1 and 2

(Count 1 input

−

Count 2 input)

Count 2 input

Measuring the ratio of error

for two inputs (measuring the

error ratio of number of

revolutions).

Display unit

Prescale value (

α)

rpm

1/N

× 60

rps

1/N

Display unit

Prescale value (

α)

m/min

πd × 1/N × 60

m/s

πd × 1/N

d: Diameter

of rotating

body (m)

Note: If the prescale value setting is incorrect, a counting error will

occur. Check that the settings are correct before using this

function.

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