The modular timer system consists of individual Releco plug-in timer modules with front cover, an 11-pole plug-in relay and a system socket with retaining spring. The individual combination allows an optimal device selection for the foreseen application. Later modifications as for example an exchange of relay from mechanical contacts to a relay with solid-state outputs are possible at any time. The user profits of a universal system of worldwide unique flexibility.
The modular Comat timer CT System
The time delay relays and monitoring relays consist of plug-in CT electronic modules and 11- pole output relays. Both system components can be combined in a variety of combinations. This allows adapting the system for the specific application. Subsequent modifications, for example a change from mechanical contacts to solid-state outputs, are possible at any time just by replacing the relay. This system provides the user a complete universal system with worldwide unmatched flexibility.
The system sockets C12B0 or C -155 serve as a basis for the secure reception of the electronic modules. The sockets have a 4-pole module slot in which the CT modules lock firmly and vibration proof also without the output relay. Contact is made with reliable twin knife contacts. With the A2 connector bridge "C-A2", the neutral conductor (N / -) can be connected from socket to socket. It reduces wiring work considerably. Robust terminals for wires up to 4 mm2 and spacious labeling are other advantages of this practical Comat modular system. Clear markings close to the terminal connections on the sockets make it easy to identify the connections for wiring and servicing.
The CT modules are proof of the practical oriented experiences of Comat in the field of industrial electronics. All control and display elements are arranged easy accessible at all times on the front side of the modules. The functions and settings are self-explanatory schematically illustrated on the front and allow to review the set values also during operation. A transparent cover over the module setting components provides protection from unintentional settings and additionally links the module to the output relay. Triggering is performed with the operating voltage. (L1 or +). No potential-free contacts are therefore required. The triggering complies to machine standards. Parallel connection to B1 is admissible.
The wide UC voltage range (AC/DC) of the modules give a wide flexibility. It permits the connection to AC or DC supplies and provides a high level of reliability in triggering.
Note: In case of even wider voltage ranges, for example UC 24-240V, triggering currents on B1 are often in the range of 100µA with simultaneous low threshold voltages of less than 20V. Due to capacitive or inductive pickups this may lead to unintentional triggering or switching errors caused by insufficient load on the control contacts (It is not seldom that 50 V or more can be measured in open lines).
The output relays show the connection diagram and the technical values on the front side, (exception C3 and C5 relays). A color code indicates an AC coil with red and a DC coil with blue color. Most of the relays have a lockable test button for manual operation. The standard contacts have proven its reliability for high switching current applications over many years. The contact material AgNi permits a wide switching range and due to the large dimensioning they are designed for a high number of switching cycles. The high breaking capacity of up to 10 A /400 V and a low load switching capability of 12 V/10 mA makes the contact suitable for the use in main circuits as well as for low voltage applications.
The twin contacts are switching the load circuit with 2 independent contact tongues. The switching safety for low currents is therefore
100 times higher compared to a single contact relay. Despite the high switching capacity of up to 6 A / 250 V, these contacts are very suitable to switch low currents and voltages up to 1mA /6 V.
The solid-state relays are an alternative to mechanical relays. In the standard version, the relay has a potential-free universal semiconductor output for AC or DC loads. The advantage is a bouncing- and wear-free, overload resistant, short circuit protected output with a practical unlimited life cycle.
Solid-state relays are specially recommended for applications of high switching cycles, for example for repeat cycle timers, flushing lights, but also for high inductive switching loads of solenoid valves, couplings, motors, etc. The solid state relays are also suitable for capacitive loads, for example long power lines, or compensated lighting circuits.
Additional protection circuits of the output or of the load are not necessary in any application for this type of Comat relays. The solid-state relays are insensitive in any aggressive environment such as chemical plants, sewage plants etc. and are therefore an excellent choice for the employment in such environments.