Schulz Scroll SCR4005 Manual De Instrucciones página 76

19. FAILURE DIAGNOSTICS
The list we present below simulates most problems and possible causes that may result in a halt or incorrect operation of the compressor.
Some procedures to solve the problems are simple, which allows the user, through the reading of the Electronic Interface display, to solve
them without the need of specialized Technical Assistance.
However, if the problem remains after the corrective actions described below, contact the nearest SCHULZ AUTHORIZED DEALER.
OCCASIONAL DEFECT
Compressor will not start.
NOTE:
The Electronic Interface was
programmed to detect possible
failures (refer to its instruction
manual).
The compressor starts and
immediately turns off.
The compressor suddenly lost
performance.
Pressure is too low in the air
system.
Note: Before any actions, read
the notes at the end of the trou-
bleshooting and in the display
of the Electronic Interface.
Compressor turns off and won't
start even with the system
pressure low.
PROBABLE CAUSE
Phase or electric power missing.
Voltage missing in the command.
Pump or fan motor overload relay tripped.
Overtemperature.
Coil of the contactors burnout.
Other causes: Wires with loose or broken contacts.
Emergency stop button activated.
Overload relay tripped.
(Read the Electronic Interface).
Installation not in compliance with the related standard.
Phase missing (installation fuse burnout).
Power supply cables of motor loose in the input or output of the
contactors.
Thermal relay with defect or contacts of contactors worn out.
Air filter clogged.
Air leak in some pipe of the compressor.
Belts loose or worn out.
Overload relay tripped.
Thermal relay tripped.
High temperature. (This compressor has temperature
sensors that will inform the Electronic Interface)
Phase missing in the command.
Coil of the contactors burnout.
Check the protection fuse of the command. With voltage on the
command, the light (if it is ok) must turn on.
Reengage it and check the cause by restarting the compressor.
Wait for some minutes until going back to the ideal operating
temperature. In case it does not solve the problem, contact the
Check this component by following the wiring scheme; find
where the voltage interruption that prevents the start of the
Unlock the button and press the reset key of the Electronic
Identify the cause, eliminate it and check the adjustment
Check current and the discrepancy between the phases, check
the cause and resize the cables if necessary.
Check the fuses and resize them if necessary.
Check the conditions of the cables and insulations and
Check the contacts of contactors K1, K2, K3. If they are good,
Network pressure is high
(unload mode time is 6 minutes)
Check the restriction indicator and the conditions of the air
Request the presence of the Technical Assistance.
Adjust the tension or replace the belts. See the Chapter
Check the current and setting of the overload relay.
Check the current and setting of the overload relay.
Check if there is air flow on the radiator. (Clean it if clogged).
Look for the cause as per the electrical scheme.
76
SOLUTION
Check the wiring and protection fuses.
Technical Assistance.
Check the coils of the contactors.
compressor is located.
Interface
range of the relay.
Check the cause for the fuse burnout.
retighten them if necessary.
observe the overload relay.
filter, replacing it if necessary.
Preventive Maintenance.
Check if the fan is not broken (blades).
Change the coil.