PRECAUTIONS IN USING THE COUNTER
5. Leakage current
1)For connecting operating voltage to the counter, a circuit should be used, which will prevent the flow of leakage current. For example, a circuit for con- tact protection as shown in Fig A. will permit leakage current flow through R and C, causing erroneous operation of the counter. Instead, the circuit shown in Fig. B should be used.
(Fig. A) |
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| (Fig. B) |
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| Leakage current |
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| R |
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Operating | R | C | C | Operating |
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voltage | voltage |
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| C | Counter |
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2)If the counter is directly switched with a
Cautions for use (common for all models)
1. Terminal connections
Correctly connect the pins while seeing the terminal layout/wiring diagram. In particular, the DC type, which has polari- ties, does not operate with the polarities connected reverse. Any incorrect con- nection can cause abnormal heating or ignition.
2.Connection to operating voltage 1)Apply the entire supply voltage through a switch, relay or other contact.
2) The operating voltage for the DC type must be at the specified ripple percent- age or less. The average voltage must fall within the allowable operating voltage range.
Rectification type | Ripple percentage |
Approx. 48% | |
Approx. 4% | |
Approx. 17% |
3)Make sure that no induced voltage and residual voltage are applied between the power terminals on the counter after the power switch is turned OFF.
(If the power line is wired in parallel with the
3. Control output
1)Keep the load capacity below the counter's rated control capacity. If used above the rating, the counter's service life may shorten. With the transistor out- put type counters, transistors may be damaged.
4. Installing the counter
1)To install the counter, use the dedicat- ed pin bracket or socket (cap). Avoid connecting the pins on the counter by directly soldering them.
2)In order to maintain the characteris- tics, do not remove the counter cover (case).
5.Superimposed surge of power supply
For the superimposed surge of power supply, the standard waveform (±1.2 ⋅ 50µs or ±1 ⋅ 40µs) is taken as the stan- dard value for
For the standard values for the LC4H type counters, see the respective items in "Cautions for use."
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waveform [±(1.2 ⋅ 50) µs] |
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voltage |
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50 |
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Surge | 30 |
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| 0 | 1.2 | 50 |
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Time (∝s)
If external surge occurs exceeding the specified value, the internal circuit may break down. In this case, use a surge absorption element. The typical surge absorption elements include a varistor, a capacitor, and a diode. If a surge absorption element is used, use an oscil- loscope to see whether or not the foreign surge exceeding the specified value appears.
6. Signal input
The counter's signal input comes in two ways. One is by opening and closing the input terminal. The other is by applying a specified
For an input sensor's residual voltage, input impedance, input voltage level and other signal input conditions, see the rat- ings for each type of product.
7. Operating environment
1)For the ambient operating tempera- ture and humidity, see the ratings for each type of product.
2)Avoid using the counter in a location where inflammable or corrosive gas is generated, the counter is exposed to much dust and other foreign matter; water or oil is splashed on the counter; or vibra- tions or shocks are given to the counter.
3)The counter cover (case), the knobs, and the dials are made of polycarbonat- ed resin. Therefore, prevent the counter from being exposed to organic solvents such as methyl alcohol, benzine, and thinner, strong acid substances such as caustic soda, and ammonia and avoid using the counter in atmosphere contain- ing any of those substances.
4)If the counter is used where noises are emitted frequently, separate the input signal elements (such as a sensor), the wiring for the input signal line, and the counter as far as possible from the noise source and the high power line contain- ing noises.
Input line
Sensor,
etc.
Counter | As remote as possible | |
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Power line, etc.
8. Checking the actual load
In order to increase the reliability in the actual use, check the quality of the counter in the actual usage.
9. Others
1)If the counter is used exceeding the ratings (operating voltage and control capacity), the contact life, or any other specified limit, abnormal heat, smoke, or ignition may occur.
2)The LC2H series counter, incorpo- rates a lithium battery.
Never disassemble the lithium battery or throw it into fire because this may affect humans and facilities. The lithium bat- tery must be disposed of as an incom- bustible like other used batteries.
3)If any malfunction of the counter is likely to affect human life and properties, give allowance to the rated values and performance values. In addition, take appropriate safety measures such as a duplex circuit from the viewpoint of prod- uct liabilities.
CTi Automation - Phone: 800.894.0412 - Fax: 208.368.0415 - Web: www.ctiautomation.net - Email: info@ctiautomation.net
