Pfannenberg DTS 3000 Series - Manual (Page 13)

10
SECTION 8: TROUBLESHOOTING
8.1 Verifying Normal Function
Environmental conditions may eliminate the need for cooling. If the door contact circuit (X54) is opened then
closed the unit will perform it's test function. This will cause all the components to activate and the unit will
provide cooling for a short time. (See below.)
If cooling does not occur, please review the troubleshooting topics listed below.
Modus Time Curve Characteristics
Start-up
Mode
t = 0s - < 30s
t = 30s
t = 32s
No function.
Internal fan start up.
External fan and compressor start up.
Flashing sequence of the status indicator: "off-dark-light-dark-off". Fault signal contact is closed.
Self Test
during
Start
t > 34s - 64s Compressor and fans remains in operation during the period.
Flashing sequence of the status indicator: "off-dark-light-off".
Fault signal contact is open.
Should a fault arise during the test mode, the unit goes into the fault mode and the
status indicator lights up according to the fault state.
NO DIP SWITCH CHANGES ARE REQUIRED.
8.2 Fault Condition
If a fault occurs, check the following points first. If the fault is then not cleared, call an authorized specialist.
Fault Possible cause(s) Remedy
Unit fails to cool.
Internal fan is running.
Temperature setting is above ambient. Check temperature setting.
Unit fails to cool sufficiently.
Required cooling capacity exceeds capacity of unit.
Dirty filter or condenser.
Lack of refrigerant.
Internal and external fans not working.
Air not circulating properly inside the switch cabinet.
Check ambient temperature and internal load.
Clean condenser. Clean or replace filter.
Call authorized technician. Check unit for leaks.
Call authorized specialist. Check fan capacitors. Replace fans.
Ensure proper electrical connections.
Check enclosure and air circulation inside enclosure. Air intake
and exhaust must be unimpeded by components.
Condensate accumulates
in switch cabinet.
Exiting temperature is too low.
Enclosure is not sufficiently sealed.
Set cooling unit to a higher temperature setting.
Close enclosure door and improve the seal in the enclosure.
Condensate fails to drain. Condensate drain is clogged
Clean condensate drainage. Condensate drainage hose must
be angled downward without showing a bend.