Main instructions for correct Main instructions for correct use of ELKO EP products
To ensure correct and perfect function of a device and its safe operation, it is necessary to ensure and observe several main regulations:
1.) Device supply
- it is necessary to ensure continuous supply of the device without drops and voltage peaks. It is mainly important for device ( e.g. dimmers) where there is synchronization managed by sine wave of the main and fault in the main ca cause unreliable function of the device
- it is necessary to observe correct connection of terminals, and in case of DC supply voltage also polarity.
- it is necessary to observe allowed tolerance of the size of supply voltage which is given by technical parameters of individual devices
2.) Protection of the device
- it is necessary to ensure protection of the device by adequate elements of overvoltage protection – by fuses, by surge arrestors
3.) Elimination of disturbances on input circuits
- it is recommended to eliminate disturbances on control inputs of devices by suitable elements ( R-C elements) and thus minimize creation of inductive voltage on incoming wires
- pay attention when connecting control inputs and while keep in mind max. current and min. voltage at rest, which can cause spontaneous switching of device ) e.g. connected glow lamps)
4.) Opereting conditions
- to assure the granted life and correct functions of device, there is not recommended to leave the device in extreme conditions that could negative way infl uence the correct device functions - permanent temperature infl uence over 70°C, agressiv exhalations, chemicals, high relative humadity over 95%, high electromagnetic fi eld or microwave radiation
- for error-free function it is necessary to avoid device placement close to electromagnetic interference source
- all mentioned products fulfi ll the EMC requirements in accordance to EU Directive 89/336/EEC. Notwithstanding it is necessary to pay attention by device connecting to circuit with electrical appliances that produce electromagnetic interference (contactors, motors), and pay attention to close power cables. It is recommended that device connecting cables (supply and control inputs) are possibly short and go separately from power cables. In case the device is connected to circuit with contactors or motors it is necessary to protect the device with appropriate extern protection components - RC members, varistors or surge voltage protector.
- when you use AL wires, it is necessary to follow requirements of ČSN standard 370606: 1959 and ČSN 370606 amendment 2: 1992
5.) Device handling and using
- input terminals do not fi ll-in with high power (for serial terminals max 0,5 N/m), do not give excessive pressure to carrier terminal parts to avoid demage of inner device construction
- protect the device before falls and excessive vibrations that could demage relays contacts
- do not overload input relay´s contacts, especially when using loads with other category then AC1
- when at switching of big loads the relay contacts get sealed it is necessary to use inserted contactor or power relay tuned to required load for given application
Description of used protection elements in device
- All time and monitoring relays from our assortment are equiped with protective elements (varistors) against possible overvoltage in supply main. Limit voltage of used varistors is 275 V. At short-time overvoltage in supply main varistor decrease its leak resistor and accumulate arosen overvoltage. When this overvoltage behave as short-time peak, varistor is able to react and protect the device against negative infl uences. As other protection elements there are used transils and zener diodes that eliminate overvoltage impulses in supply and input circuits of device (e.g. when switching inductive loads). In case of switching inductive loads it is recommended to separate a supply of power element (motors, contactors etc.) from supply of measuring and control device inputs.
