Sistem pendingin merupakan sistem sistem yang sangat penting yang digunakan pada PLTP. Sistem pendingin berfungsi untuk proses pendinginan air, selain itu sistem pendingin juga digunakan untuk mendinginkan motor pump, motor kondensor dan proses reinjeksi pada perut bumi.Prinsip kerja sistem ini adalah sistem akan bekerja saat sensor suhu pada hot basin akan mendeteksi temperature suhu air. Saat suhu air pada hot basin >50⁰C, maka output PLC akan mengaktifkan pompa Hot basin, valve cold basin, kipas dan sprayer. Jika 35⁰C, maka PLC akan mengaktifkan pompa cold basin dan valve feedback yang akan didinginkan kembali dan di tampung di cold basin Kata kunci: PLC, cooling tower, temperatur, cold basin, hot basin, pompa.

The cooling system is a system that is very important systems used in geothermal power plants. The cooling system is used to process cooling water, beside that the system is also used to cool the coolant pump motors, condenser motors and reinjection process in perit earth.The working principle of this system is that the system will work when the temperature sensor detects the temperature of the hot basin water temperature. it works when the temperature sensor detects the temperature of the hot basin water temperature. When the temperature of hot water in the basin >50⁰C, then the output of the PLC will activate the pump Hot basin, basin cold valve, fan and sprayer. If 35⁰C, the PLC will activate the pump and valve cold basin feedback will be cooled again and accommodated in the cold basin Keywords: PLC, cooling tower, temperature, cold basin, hot basin, pump.

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