Pfannenberg DTS 3000 Series - Manual (Page 14)

DTS Series Cooling Units
11
8.3 Error Codes
Unit Characteristics Technical Causes Fault Remedy
Compressor: ON
Internal Fan: ON
External Fan: ON
Status LED: flashing (seq. 3)
Fault signal contact: open
The test mode of the unit is active. This mode is left
automatically at the latest after 60 s.
The unit switches to test mode once after each new
connection to the power supply. No remedy of fault
necessary.
Compressor: OFF
Internal Fan: OFF
External Fan: OFF
Status LED: flashing (seq. 1)
Fault signal contact: closed
The input for the door limit switch is open - e.g. as a
result of a switch cabinet door not closed or a bridge
not set.
Insert link, close door contact switch, or with an
engaged door contact switch, close the door.
Compressor: OFF
Internal Fan: ON
External Fan: OFF
Status LED: flashing (seq. 2)
Fault signal contact: open
High pressure pressostat or motor protection switch
has responded (overheating). Compressor switches on
again automatically after the fault has been remedied
(cooling) with a delay of 30 s.
Clean filter mat or heat exchanger in the external
circulation. Possibly check the power dissipation in the
switch cabinet to the installed cooling capacity of the
cooling unit.
Compressor: ON
Internal Fan: ON
External Fan: ON
Status LED: flashing (seq. 1)
Fault signal contact: open
The upper temperature limit (T
L2
) of the switch cabinet
has been exceeded.
Clean filter mat or heat exchanger in the external
circulation. Possibly check the power dissipation in the
switch cabinet to the installed cooling capacity of the
cooling unit.
**Sequence 1: (User Error)
***Sequence 2: (Unit Fault)
****Sequence 3:
(Test/start-up mode)