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Cautions
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Precautions for Correct Use of Counters
Input Connection
Consider the residual voltage of the input sensor and make sure that the input conditions of the Counter conform with the rated conditions.
Connection Example with Photoelectric Sensor:
E3X-DA11
Note: The residual voltage is the voltage between the output and 0-V lines when the transistor is ON (i.e., the total voltage between both edges of the transistor and diode bridge).
Connection Example with Proximity Sensor:E2E-X[]E
*1 200 mA max. (load current)
*2 Output with Tr connected.
Connection Example with Programmable Controller:CJ1W-OD211
・ The Counter may not receive count inputs correctly when using an input waveform for with an inverter current.
Power Supply
・ Impose supply voltage on the Timer through a switch or relay contact at one time. Do not impose supply voltage gradually, otherwise the Timer may go into time-up condition or may not be reset.
・ The Counter requires 50 ms for stable operation after power is turned ON. Input signals only after this 50-ms period has lapsed. For details, refer to the section on each product.
・ AC power can be applied to the Counter regardless of the polarity of the power supply terminals. When supplying DC power, be careful enough not to make a mistake in polarity
・ Be sure that the ripple rate of DC power supplied to the Counter is within the rated range.
・ The Counter can withstand an external impulse voltage with a ±(1.2 × 50)-µs standard waveform, which conforms to the Japanese JEC-210 standards, imposed between the power supply terminals. If an impulse voltage exceeding this should exist, use an appropriate surge absorber.
・ Make sure that no residual voltage or inductive voltage exists when the power is turned OFF.
・ Be sure that the capacity of the power supply is large enough,otherwise the Counter may not start due to inrush current that may flow for an instant when the Counter is turned ON.
Control Outputs
・ Use a load current for the control output relay contacts that is below the rated applicable load. Otherwise the life of the relay contacts will be significantly shortened, or if transistors are used, the transistors may be damaged.
・ The life of control output relay contacts depends greatly on switching conditions. Be sure to test the contacts in actual operating conditions prior to using them, then use them within a range of switching cycles that will not cause any problems. If a contacts are used after their performance has degraded, it may eventually cause insufficient insulation between circuits or burning damage to the relay itself.
・ For micro-load switching, check the minimum applicable load that is given for each product.
Mounting
・ There is no particular restriction on surface mounting directions, but be sure that the Counter is securely mounted horizontally.
Surface Mounting
・ When mounting the Counter vertically with the P2CF Socket, consider the movable hooks and be sure that there is a 20-mm space on each of the upper and lower parts of the Socket.
Flush Mounting
・ When the Y92F-30 Flush Mounting Adapter is used, insert the Counter into the square hole from the front side of the panel and put on the Flush Mounting Adapter from the rear side of the Counter. Press the Flush Mounting Adapter so that the space between the Flush Mounting Adapter and the panel is reduced as much as possible,and secure the Flush Mounting Adapter with screws.
・ When multiple Counters are closely mounted vertically, be sure that the molded springs of each Y92F-30 Flush Mounting Adapter are located on the left and right sides.
・ When multiple Counters are closely mounted horizontally, be sure that the molded springs of each Y92F-30 Flush Mounting Adapter are located on the top and bottom sides.
Dismounting
To dismount the Y92F-30 Flush-mounting Adaptor from the Counter,loosen the screw of the Y92F-30 and move both hooks upwards and downwards respectively.
Setting
When using a key switch for setting, do not use your fingernail or an instrument with a sharp point, otherwise the key may be damaged.
Others
・ When conducting a dielectric test, impulse voltage test, or insulation resistance test between an electric circuit and noncurrent-carrying metal parts of the Counter mounted to a control panel, be sure to take the following steps.
1. Separate the Counter from the circuitry of the control panel by disconnecting the socket from the Counter or wires.
2. Short-circuit all terminals of the Counter.(These steps will prevent the circuits in the Counter from damage that may be caused if a machine on the control panel has an improper dielectric strength or insulation resistance.)
・ The Counter constantly reads changes to the preset value. (The H7AN-R[] Counter can also be set so that it will read preset value changes when it is reset.) The Counter will produce an output signal if the data input change coincides with the Counter input. Refer to the section on the relevant product for information on reading the operating mode and other function settings.
・ Do not tighten any terminal screw excessively.
・ Counter-electromotive voltage is generated by any inductive load that is turned on or off. For the purpose of surge absorption, when using the Counter to switch an electromagnetic device, such as a solenoid valve, apply a diode if the electromagnetic device is in DC circuitry and a surge absorber if the electromagnetic device is in AC circuitry, otherwise Counter damage or malfunctioning may result.
Examples of Surge Suppressor
| Circuit example | Applicability | Features and remarks | Element selection | ||
| AC | DC | ||||
| CR |  | (See remarks.) (OK) | OK | Load impedance must be much smaller than the CR impedance when the Relay operates on an AC voltage. When the contact is open, the current flows through C and R to the inductive load. | Use the following as guides for C and R values: C: 0.5 to 1 μF for a 1-A contact current R: 0.5 to 1 Ω for 1-V contact voltage However, these values may depend on numerous factors, including the type of load and variations in characteristics. Confirm optimum values experimentally. Capacitor C suppresses the discharge when the contacts are opened, while the resistor R limits the current applied when the contacts are closed the next time. Generally, use a capacitor with a dielectric strength of 200 to 300 V. When it is to be used in an AC circuit, use an AC capacitor (with no polarity). When it is to be used with high DC voltage, if there is any question about the ability to short the arcing of the contacts, it may be more effective to connect the capacitor and resistor across the contacts, rather than across the load. Perform testing with the actual equipment to determine this. |
 | OK | OK | The release time of the contacts will be delayed when a Relay or solenoid is used as the load. | ||
| Diode |  | NG | OK | The energy stored in a coil (inductive load) reaches the coil as current via the diode connected in parallel with the coil, and is dissipated as Joule heat by the resistance of the inductive load. This type of circuit delays the release time more the CR type. | Use a diode having a reverse breakdown voltage of more than 10 times the circuit voltage, and a forward current rating greater than the load current. A diode having a reverse breakdown voltage two or three times that of the supply voltage can be used in an electronic circuit where the circuit voltage is not particularly high. |
| Diode + Zener diode |  | NG | OK | This circuit effectively shortens release time in applications where the release time of a diode protection circuit is too slow. | The breakdown voltage to the Zener diode should be about the same as the supply voltage. |
| Varistor |  | OK | OK | This circuit prevents a high voltage from being applied across the contacts by using the constant-voltage characteristic of a varistor. This circuit also somewhat delays the release time. This circuit is effective if connected across the load when the supply voltage is 24 to 48 V. If the supply voltage is 100 to 240 V, connect the circuit across the contacts. | The cutoff voltage Vc must satisfy the following conditions. For AC, it must be multiplied by √2 Vc > (Supply voltage × 1.5) However, if Vc is set too high, its effectiveness will be reduced because it will fail to cut off high voltages. |
Do not use the following types of contact protection circuit.
 | This circuit arrangement is very effective for diminishing sparking (arcing) at the contacts when breaking the circuit. However, since electrical energy is stored in C (capacitor) when the contacts are open, the current from C flows into the contacts when they close. This may lead to contact welding. |  | This circuit arrangement is very useful for diminishing sparking (arcing) at the contacts when breaking the circuit. However, since the charging current to C flows into the contacts when they are closed, contact welding may occur. |
Note: Although it is considered that switching a DC inductive load is more difficult than a resistive load, an appropriate surge suppressor can achieve almost the same characteristics.
・ Inrush current depends on the type of load, and may affect the contact switching frequency, number of usable switching operations, etc. It is recommended that you check the rated current and the inrush current, and design the circuit with a sufficient margin for variation in these current values.
・ Disconnect the wiring before replacing the battery. Touching parts to which a high voltage is applied may result in electric shock.
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