GX9901C temperature controller

temperature controller with single output

General description

The Gx 9901C is a one-intervention point electronic temperature controller specifically designed for refrigeration applications.

The differential shall be set to positive values, the compressor cuts off at setpoint and is started at a temperature of setpoint plus differential.

In addition,the Gx9901C offers several system protection features,the can be easily understood by analysing the programmable parameters,and ensure a suitable compressor protection at close startups.with a negative differential the controller can be used for heating applications. The output stops when the setpoint is reached and restarts when the temperature is equal to setpoint minus the differential.

The Gx9901C can be used in several applications with a measurement range of 50 and 50℃.

Front keypad

SET: push and release to disply the setpoint temperature,the setpoint can be changed within 15 seconds with the ” or ”button, the new value is automatically stord after 15 seconds since the last operation.

”UP: used to increase the setpoint value,as well as the parameters when in programming. When held down for a few seconds, the change rate accelerates.

”DOWN: used to decrease the setpoint value,as well as the parameters when in programming mode. When held down for a few seconds, the change rate accelerates.

Parameter programming

Programming is accessed by holding the SET” button down for more than 15 seccond. The first parameter label is displayed;other parameters are accessed with the ” andbutton. with the set” button ,the current setting of each parameter setting, push the ” orkey. New values are stored on exiting programming mode(when no key is pressed for 12 seconds)

Description of parameters

1.D: differential of intervention

Set to positive values for cooling applications mode.

2.Pt: compressor protection

It establishes protection to prevent close startups of the compressor. Delay on compressor activation,expressed in minutes.

3.CA: Calibration

Permits to change the value read by the probe in case of errors due to the sensor position.

Mechanical mount

The instrument is designed for flush panel mounting. Drill a 71*29mm hole and insert the unit fixing it with the U-bracked supplied. The ambient temperature around the instrument for correct operation should be kept between 5 and 55℃. Do not install the instrument in moist and/or dirty places; it is suitable for operation in environments with an ordinary pollution level. Leave enough room for air circulation by the cooling holes of the instrument.

Electrical wiring

Operations on electrcal connections shall always be carried out after turning the machine off. The instrument is equipped with an internal screw terminal block suitable for max 2.5mm wiring(one wire each terminal only,in compliance with VDE norms)

Make sure that the power supply corresponds with the rating shown on the instrument. The NTC type probe does not require polarity and can be easily extended by using common 2-lead wires(please note that long probes involve a worse instrument performance for electromagnetic compatibility; utmost care shall be put in cabling)

The relay output is voltage-free and can control a direct compressors load up to 0.5HP at 230V~(or 0.25HP at 115V~). For heaavier loads, an external contactor shall be used.

Error signals

The instrument is provided with error message E1”, in case of shorted sensor and in case of sensor failure, or sensor absence. The E1” error message also appears in the event of underrange/overrange of the system temperature.

It is recommended to doublecheck the sensor wiring before replacing the probe.