Binder MKF - Page 136

MKF / MKFT (E5) 06/2020 page 136/176
Fault description
Possible cause
Required measures
Heating
Chamber heating permanently,
set-point not maintained.
Semiconductor relay defective.
Contact BINDER service.
Pt 100 sensor defective
Controller defective.
Controller not adjusted.
Calibrate and adjust controller.
Chamber doesn’t heat up.
Heating element defective.
Contact BINDER service.
Semiconductor relay defective
Chamber doesn’t heat up when
turned on.
Safety controller responds.
Inner chamber temperature has
reached the safety controller setpoint.
Safety controller set too low.
Acknowledge the alarm on the
controller. Check temperature
setpoint setting. If appropriate,
select suitable safety controller
setpoint (chap. 12.2).
Safety controller (chap. 12.2) defec-
tive.
Contact BINDER service.
Safety controller class 2
responds.
Limit temperature reached.
Acknowledge the alarm on the
controller. Disconnect the
chamber from the power supply
and let it cool down. Detect
cause and remove it.
Start up the chamber and check
control functions. If appropriate,
select suitable limit value.
Over-/under temperature safety
device class 2 (option)
responds.
Limit temperature reached.
Acknowledge the alarm on the
controller. Disconnect the
chamber from the power supply
and let it cool down. Detect
cause and remove it. Press
button “RESET CL 2.0” (2).
Start up the chamber and check
control functions. If appropriate,
select suitable limit value.
Refrigerating performance
No or low refrigerating perfor-
mance.
Ambient temperature > 25 °C / 77°F
(chap.3.4).
Select cooler place of installa-
tion.
Combination of temperature/humidity
values not in the optimum range (see
temperature humidity diagram, Figure
19).
Select combination of tempera-
ture/humidity values in the op-
timum range (chap. 17).
Compressor not turned on.
Contact BINDER service.
Electro-valves defective.
No or not enough refrigerant.
No refrigerating performance;
information message “Preheat
phase” on the controller dis-
play.
MKF 56: Main power switch (1)
turned on less than 1 hour before
operating the chamber.
Turn on the main power switch
(1) at least one hour before
operating the chamber.
MKF / MKFT 115, 240, 720: Main
power switch (1) and/or rear power
switch (12) turned on less than 1 hour
before operating the chamber.
Turn on the main power switch
(1) and/or the rear power switch
(12) at least one hour before
operating the chamber.
Condensation
Condensation at the samples.
Heating-up phase without anti-
condensation protection.
Use the anti-condensation pro-
tection (chap. 19).
Heating up very fast.
Select lower heating up speed
(ramp).