Binder MKF 400 - Page 135

MKF / MKFT (E5) 04/2022 page 135/176
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 set-
point. 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 ap-
propriate, 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 but-
ton “RESET CL 2.0” (2).
Start up the chamber and
check control functions. If ap-
propriate, 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,
Fig-
ure 19).
Select combination of tempera-
ture/humidity values in the opti-
mum 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 op-
erating the chamber.
Turn on the main power switch
(1) at least one hour before op-
erating the chamber.
MKF / MKFT from size 115 on:
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-con-
densation protection.
Use the anti-condensation pro-
tection (chap. 19).
Heating up very fast.
Select lower heating up speed
(ramp).