SYSTEM MAINTENANCE PROCEDURE FOR STABILITY CHAMBER
GENERAL MAINTENANCE
ONLY TRAINED AND SKILLED PERSONS SHOULD MAINTAIN THE MACHINE.
Follow work permit procedure before any maintenance work. Thermolab will not be responsible if the same is ignored.
Check whether the stability chamber is clean from inside and outside after use.
Check the humidity tank, kettle heater and reservoir tank one in two month and remove scaling.
Remove the main plugs and check whether the control panel is clean, clean it by means of vacuum cleaner.
Check whether the motor bolts at the backside of stability chamber are tightened.
Check whether the air-circulating blower in the duct is tightened.
Check whether the temperature sensor is clean.
Check whether the condenser is clean, if not clean by blowing air through it in every two month.
Check the terminals in the control panel and if found loose tighten it.
Check the working of safety controller for safety cut off by means of giving the external heating to the PT100 sensors. The safety controller should cut off the main contactor giving audio video alarm.
Calibration and Validation of the stability chamber should be done once in a year before the expiry of the due date mentioned by Thermolab.
TROUBLE SHOOTING
HEATING EFFECT NOT ACHIEVED IN THE CHAMBER.
MCB (MB3) may have trip. – Check the MCB (MB3). If found trip, switch it ON.
DC output not available. – Check the DC output from the controller.
SSR not working. – The DC supply comes from the controller terminal 13 (+ve) and 14 (-ve) to SSR terminal 3(+) & 4(-). The output of the SSR is (504) connected to Dry Heaters. If the controller is giving 5 Volts DC to the SSR input and the SSR output terminal is not showing the phase (230 Volts) that means the SSR is not working, this has to be replaced.
Air heater not working. – The phase from the output of the SSR (504) is given to the heater and the neutral is directly connected. In case the phase is provided and still heater is not heating up, that means, heater is broken. Also check the heater continuity with the body. If not proper, then replace the heater.
Safety Thermostat is not working. – Check the safety thermostat and if found not working replace it.
HUMIDITY EFFECT NOTACHIEVED WITH REGULAR HUMIDITY SYSTEM ON
MCB (MB4) may have trip. – Check the MCB (MB4). If found trip, switch ON it.
SSR not working. – The DC supply comes from the controller terminal 13 (+ve) and 14 (-ve) to SSR terminal 3(+) & 4(-). The output of the SSR is (554) connected to Wet Heaters. If the controller is giving 5 Volts DC to the SSR input and the SSR output terminal is not showing the phase (230 Volts) that means the SSR is not working, this has to be replaced.
Humidity Heater not working. – The phase from the output of the SSR (554) i.e. WH is given to the heater and the neutral is directly connected. In case the phase is provided and still heater is not heating up, that means, heater is broken. Also check the heater continuity with the body. If not proper, then replace the heater.
5 Volt DC output is not getting to the RH sensor. – 5 Volt DC output to the sensor from a 5 VDC unit is not getting.
RH sensor is not working – RH sensor output should be between 1 to 3 VDC. Checking of RH sensor output should be done on green and black wire. If the output of RH sensor is not obtained replace it.
HUMIDITY EFFECT NOTACHIEVED WITH STANDBY HUMIDITY SYSTEM ON
MCB (MB6) may have trip. – Check the MCB (MB6). If found trip, switch ON it.
Humidity Heater not working. – The phase from the output of the SSR (573) i.e. WH is given to the heater and the neutral is directly connected. In case the phase is provided and still heater is not heating up, that means, heater is broken. Also check the heater continuity with the body. If not proper, then replace the heater.
5 Volt DC output is not getting to the RH sensor. – 5 Volt DC output to the sensor from a 5 VDC unit is not getting.
RH sensor is not working – RH sensor output should be between 1 to 3 VDC. Checking of RH sensor output should be done on green and black wire. If the output of RH sensor is not obtained replace it.
COOLING EFFECT NOT ACHIEVED WITH REGULAR COOLING SYSTEM
MCB (MB5) may have trip. – Check the MCB, if found trip, switch ON it.
Overload or the capacitor of the compressor not working. – Check the compressor for overload and starting and running capacitor for the supply to the compressor. If found faulty, replace it.
Time delay faulty – The supply from compressor switch (C3) is given to the time delay. The output of the time delay is given to the CP. Check the supply at 604 .If the supply is not coming then NO point is not working. Hence time delay has to be replaced.
Condenser Motor not working – Check the capacitor and motor winding.
CHAMBER MOTOR NOT WORKING
MCB (MB1) may have blown off. – Check the MCB if found trip, Switch ON it.
CONTROLLER NOT WORKING
MCB (MB2) may have blown off. – Check the MCB. If found blown replace it.
Display card or inside component loose – If the display card or any of the inside components is loose, the controller will not show any display or will work erratic. Replace the controller.
CONTROLLER SHOWING OPEN
Sensor wire broken. – Check the sensor wire. If found broken, replace the sensor.
Sensor wire having loose connections. – Check the sensor wire connections on the controller. If found loose, tighten it.
DC output not available – Check the DC output from 5 VDC unit to the sensor. If not present, check for any loose wire connections or a loose terminal, which has to be tightened.
Check the safety controller output. – The safety controller will put off the main contactor C1 in case of overshooting or undershoot of temp. and humidity. The phase for the motor is taken from the contactor C1. In case, the contactor C1 is put off, the chamber motor will not run.
