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11.2 Operation display
The cooling unit is provided with an operation display,after the power supply is switched on, then cabinet
internal temperature is shown,This indicates the unit works properly. If there is a failure or an alarm, the alarm
lamp will be turned on and accompanied by an alarm sound, which makes it easier to diagnose the cooling
unit. (Refer to section 15 for diagnosis)
11.3 Start-up / Self-inspection mode
The cooling unit does not work if the door switch is open. Each time the unit is power-on (when the door
switch is closed), the unit performs a start-up process lasting around 30 seconds which is followed by a t self-
inspection mode lasting around 120 seconds. During the self-inspection mode, the unit will finish the self-
inspection process even when an alarm occurs. It enters into a normal working mode if there is no failure. If
there is an alarm during start-up, the alarm code will be diaplayed on the dispaly. The cause must be found
& fixed to enable proper functioning.
11.4 Door contact
For safety reasons, a door limit switch should be connected to the terminals provided on the cooling unit. (see
the wiring diagram on housing cover or refer to (8.1circuit diagram). With the switch in place, when enclosure
door is open (thereby opening the switch), all of the motors are turned off with a time lag.
In order to avoid any disruptive influences, it is recommended that a sheathed cable with twisted pair leads
be used.
No external voltage is required.
If no door contact switch is used, the connecting contacts are to be bridged.
11.5 Equipment fault
• Power fault signal X54—1, 2pin is NC, it closes when power supply is on properly, failed power supply at
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