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Electronic timing relays are used in contactor control systems which require short reset times, high repetition accuracy, high switching frequency, and a long component lifespan. Times between 0.05 s and 100 h can be easily selected and set.
The switching capacity of electronic timing relays corresponds to the utilisation categories AC 15 and DC 13.
In terms of the actuating voltages there are with timing relays the following differences :
The functions of each of the timing relays are as follows:
- DILET11, ETR4-11,ETR2-11 Function 11 (on-delayed)
- ETR2-12
Function 12 (off-delayed) - ETR2-21
Function 21 (fleeting contact on energisation) - ETR2-42
Function 42 (flashing, pulse initiating) - ETR2-44
Function 44 (flashing, two speeds; can be set to either pulse initiating or pause initiating) - Multifunction relay DILET70, ETR 4-69/70 Function 11 (on-delayed)
Function 12 (off-delayed)
Function 16 (on and off delayed)
Function 21(fleeting contact on energisation)
Function 22 (fleeting contact on de-energisation)
Function 42 (flashing, pulse initiating) - Function 81 (pulse generating)
Function 82 (pulse shaping)
ON, OFF - Multifunction relay ETR2-69 Function 11 (on-delayed)
Function 12 (off-delayed)
Function 21 (fleeting contact on energisation)
Function 22 (fleeting contact on de-energisation)
Function 42 (flashing, pulse initiating)
Function 43 (flashing, pause initiating)
Function 82 (pulse forming) - Star/delta timing relay ETR4-51
Function 51 (on delayed)
With both DILET70 and ETR4-70 an external potentiometer can be connected. Upon connection, both timing relays automatically recognize that a potentiometer is fitted.
The ETR4-70 has a special feature. Equiped with two change-over contacts which can be converted to two timing contacts 15-18 and 25-28 (A2-X1 bridged) or one timing contact 15-18 and a non-delayed contact 21-24 (A2-X1 not bridged). If the link A2-X1 is removed, only the timed contact 15-18 carries out the functions described below.
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