Temperature regulator drying room temperature control circuit one b

(a) A three-position temperature regulator KP is used, which has two temperature settings: upper limit and lower limit. During the heating
period of the drying room, contacts 3 and 1 and contacts 3 and 2 are closed, and the three-phase electric furnace wires are connected in a triangle; when the temperature drops to the lower limit, connections
3 and 1 are disconnected, and the electric furnace wires are connected in a delta. Form connection method, enter the insulation stage. When the temperature reaches the upper limit, contacts 3 and 2 also break
F, the electric furnace wire is powered off, and heating stops. Repeat the above process to keep the drying room temperature within the set upper and lower
temperature ranges.
    Figure 11-57 (h) uses a two-position temperature regulator KP. When the temperature in the drying room does not reach the set value, contacts 3 and 2
are always closed, and the electric furnace wire is connected in a triangle; when the temperature reaches the set value, contacts 3 and 1 are closed, the electric furnace wire is powered off, and
heating stops. When the temperature drops below the set value, KP becomes contacts 3 and 2 closed again, and contacts 3 and 1 open. However, at this time,
because the intermediate relay KAz is already in the pull-in state, the contactor KMz is electrically closed. The electric furnace wires are connected in a star connection for
heat preservation. When the temperature rises to the set value again, the electric furnace wire is powered off and heating stops. Repeat the above process to
keep the drying room temperature near the set value.
    The temperature regulator adopts XCT-122 type.