- 15 -
Alarm message is indicated with flashing at
part of LDC panel .
When several alarms occur simultaneously, 4
alarms can be indicated
with in order of
precedence.
3-5 Safety and alarm function
Safety function
Alarm function
Temp 19.5
Total Time 003/09:28
19.5
℃
Alarm indication in Normal mode
Humi 80.0
80.0
%
RH
Temp 23.5
Total Time 003/09:28
23.5
℃
Humi 70.0
70.0
%
RH
Pro 3
Seg 4
Repeat 2 001/10:18
SET
MEAS
SET
MEAS
This unit has safety and alarm functions
as below.
When you face the trouble, please refer to
[Troubleshooting] on P.35 and follow the
instructions.
Safety device
Function
Cause
Over heat protector
for temperature
inside the chamber
Turns off to shut down the power.
Electric leakage or excess current occurs.
When the temperature inside the
chamber exceeds the setting
temperature for over heat protector,
the alarm message[TH] is
displayed with flashing and all
control operations are stopped.
Mains switch
- The setting temperature for over heat protector is
too low.
-Due to some trouble of temperature controller,
SSR or chamber fan, the temperature inside the
chamber exceeds the alarm temperature
Boil-dry protector
for humidification
tray
When the top and bottom
humidification tray are empty, the
alarm message [TH1] (for top) and
[TH2] (for bottom) are indicated with
flashing and all control operations are
stopped.
- The humidification tray is not supplied water.
- Low water level of the tray.
-Due to some trouble of temperature controller or
SSR, temperature inside the chamber exceeds
the alarm temperature
Overload relay
holding circuit for
refrigeration unit
When the refrigeration unit works
under overload (overheat) or start-up,
the alarm message [OLR] is
indicated with flashing and all control
operations are stopped.
-The refrigeration unit works or starts up under
overload (overheat) .
-Due to overheat operation exceeding the cooling
capacity, temperature inside the chamber rises
abnormally.
- The environmental temperature exceeds 35
℃
.
- Low voltage
High pressure
switch for
refrigeration unit
When the refrigeration unit works
under high pressure and the
pressure value exceeds its upper
limit, the alarm message [HP] is
indicated with flushing and all control
operations are stopped.
- The refrigeration unit works under
overload (overheat).
-Due to overheat operation exceeding the cooling
capacity, the temperature inside the chamber rises
abnormally
- The environmental temperature exceeds 35
℃
.
- The fan motor for condenser breaks down.
Alarm indication in Program mode
Some alarm functions continue to control or
stop the control operation depending on its
significance of the cause.
The unit is incorporated the watch-dog system
which detects crash of CPU and resets the
circuit by self-diagnosis.