Timers play a crucial role in process and sequence control. These are used for switching a process on or off at a predetermined time interval. Telemecanique & controls, manufacture electro-pneumatic timers, in collaboration with the world leader-telemecanique of france. They are suitable for machine tools, sequence control and other applications where quickly adjustable and dependable timers are required. Tc time delay contact blocks have been ingeniously designed to attain a highly flexible product and to suit varied requirements. The electro-pneumatic timer includes a time delay contact block that can be mounted on a control relay or a tc power contactor [ac/ dc]. The contact block can be used as an independent timer similar to conventional pneumatic timers when mounted on a control relay. The time delay contact blocks can be connected to the tc control relay/power contactor using a mechanical latch, which ensures absolutely rigid coupling with tc control relay/power contactor and is totally unaffected by machine vibrations or other mechanical shocks. Tc time delay contact blocks are available in on-delay and off-delay versions. On-delay/off-delay timer blocks can be readily interchanged in the field. On-delay, off-delay, and time ranges areas given below:
[1] la2-d20/ta2dto, la3d20/ta3dro, 0.1 to 30 sec;
[2] la2-d22/ta2dt2, la3-d22/ ta3dr2, 0.1 to 30 sec;
[3] la2-d24/ta2dt4, la3-d24/ ta3dr4, 01 to 180 sec.
