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Judging Steps for Common Problems
Definition
Classification
Operational Principle
Meaning of Technical Index
Technical Requirements per Application
Cautions in Applying and Installing
Considerations in choosing
Cautions in Using
Kinds of Loads
Ambient Conditions
Safety Requirements
Safety Standard Certification
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Judging Steps for Common Problems

The Coil
ㆍ Is the supplied voltage the stipulated rated voltage?
ㆍ Is the voltage in the maximum continuously working range?
ㆍ Is the ripple voltage within the allowed band?
ㆍ While hot-start, the temperature-rise of the coil increases the resistance of the coil.
    Is it necessary to re-adjust the pick-up voltage?
ㆍ Does the load current affect the coil-voltage
    so that it causes the transient voltage drop?
ㆍ Does the rated voltage selected permit the fluctuation of the rectifier power source?
ㆍ When the voltage of the coil rises or falls slowly, the working state of the relay will be unstable.
    Has the relay been tested in actual application condition?

Load
(at the contact)

ㆍ Is the load parameter within the rated value range of the contact?
ㆍ Is the load in excess of the maximum on-off capacity of the contact?
ㆍ Caution: when the load is a motor, lamp, solenoid or capacitor,
    the contact will appear fusion-welding easily.
    Has the relay been tested under the actual load?
ㆍ When it is used under the direct-current load, the material of the contacts will be
    transferred heavily. Has the relay been tested under the actual load?
ㆍ When it is used under the inductance-load, is there any surge-adsorption circuit
    applied between the contacts?
ㆍ Is the switching frequency of the contact lower than rated value of the sample?
ㆍ When the relay with two or above groups of contacts is used, the metal sputtering
    of one group will affect the other group, even causes the other group failing to work.
    Has the relay been tested under the actual load?
ㆍ The time-delay capacitor connecting to the two leading-outs of the contact may
    cause the contact fusion-welding. Has the relay been tested under the actual load?
ㆍ As for the alternating current relay, the rebound of the large contact will cause the
    contact fusion-welding. Has the relay been tested under the actual load?
ㆍ Connecting to the transformer load, it will produce high voltage.
    Has the relay been tested under the actual load?

Driving circuit
ㆍ Does the driving circuit board cause the coil to produce electrolytic corrosion?
ㆍ Is the driving rated value of the relay up to the International standard?
ㆍ The protection-circuit will cause the exciting-time or de-exciting-time of the relay to
    be too long. Does it bring problems to the relay?
ㆍ Is it the problem caused by the contact rebound due to the protection-circuit?
ㆍ When the relay with two or above groups of contacts is used, the arc discharge
    produced by the load may cause short-circuit between the contact-groups.
    Is there any measure to prevent arc discharging in the circuit?
ㆍ In the previous statement, when the load is supplied with another power source,
    the operator should pay special attention to it.
ㆍ After installation, is the insulating distance conform with the relevant International
    Standard or "The Control Regulations for Electric Equipment and Material"?
ㆍ When the relay is driven by the transistor circuit, is there any problem in the protection circuit?

Working
Environment

ㆍ Is the environment temperature within the permitted temperature range?
ㆍ Is the relative humidity below 85%?
ㆍ Is it free from organic gas or vulcanized gas in the working surroundings?
    Is it free from silicon-based air?
ㆍ Is there excessive suspension dust in the surroundings?
ㆍ Is the vibration and collision level below the permitted level for the relay?
ㆍ On the actual installation location, is the relay free from the affection of resonance?
ㆍ Is there any insulating barrier between the relay and the PC board?

Installation
& Connection

ㆍ When the manual welding is implemented, is there any protection for the relay to prevent it from being
    contaminated by the welding spatter or agent?
ㆍ Is there any consideration for anti-welding agent or fully automatic welding case?
ㆍ When one washes the PC board, is there any consideration for the minimum influence on the relay?
ㆍ Is the leading-out terminal of the relay not fit for the socket?
ㆍ If a long conducting wire (100-300m) is used to connect the load, the parasitic capacitance in the wire
    may produce surge current. Has the relay been tested under the actual load?
ㆍ Unless otherwise specified, the welding condition for all relay leading-out terminals is
    250C for 5 seconds or 350C for 3 seconds.

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