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Message on
Problem
Sentinel2
SENTINEL-PRO don't switch on
ALL messages
Sentinel displays an alarm but unit doesn't stop
NONE
None alarme is displayed but fan is not powered by
message
Sentinel when unit is running.
AL-B-01
Unit speed or Pressure P2 exceed the expected limits
AL-B-06
AL-B-02
Unit speed is lower than the expected limits
AL-B-03
Alarm is on even if the unit runs in the proper direction
AL-B-04 AL-
Alarms AL-B-04 and AL-W-05 are on but suction filter is
W-05
not clogged nor dirt
AL-B-05
AL-B-07
AL-B-10
Faulty probe
AL-B-12
AL-B-15
AL-B-18
High oil pressure
AL-B-08
(for WS-WL /S)
Low oil pressure
AL-B-09
(for WS-WL /S)
AL-B-11
Unit discharge temperature exceed the expected limits
AL-B-13
Oil temperature exceeds expected limit
AL-B-16
AL-B-14
Oil temperature is lower than the expected limit
AL-B-17
Sentinel doesn't reset emergence alarm even if the
emergency button is not activated
AL-B-19
Pushing the emergency button unit doesn't stop even if
Sentinel2 doesn't displays message E
Pushing the emergency button unit doesn't stop
Sentinel reveals main motor current protection but the
AL-B-20
protection has not really intervened
Sentinel reveals fan current protection but the protection
has not really intervened
AL-B-21
Fan current protection halt the fan and subsequently
the compressor
AL-B-22
Sentinel stops always the blower and visualizes the
AL-B-23
messages AL-B-22 or AL-B-23 even if there is oil
AL-B-24
Faulty communication between CPU and Display
AL-B-25
Main motor PTC intervene but motor isn't hot
Alarm IN4 open is activated after 50 seconds from unit
AL-B-26
Sentinel displays belt broken but belt is not borken not
AL-B-27
AL-W-12
Alarm is ON while machine is not running
Data Download
Sentinel downloads data on smart-key but file is empty Previously damaged files on smart-key
Wrong connection for terminals 430-432
Wrong connection for terminal 437
Operating conditions are different from the
expected ones.
Unit is VFD operated and minimum speed is
lower than set-up
Unit is arrested with VF by a deceleration
ramp.
Belt sliding on pulleys
Compressor is set to /F or /S and it's effectively
a blower
Set values for pre alarm P-P1 and for alarm
A-P1 are set not correctly
Sentinel doesn't receive any signal from
transducer
Oil injection circuit is clogged
Oil injection valve has to be regulated
Unit's operated by VFD at a minimum speed
lower than the one indicated in the compressor
instruction manual
Unit is arrested with VF by a deceleration
ramp.
Oil injection valve has to be cleaned/regulated
Ambient temperature is too high
Wrong rotation direction for noise hood fan
Noise hood fan is not working or faulty
Operating conditions (discharge pressure, inlet
temperature ...) are different from the expected
ones.
Oil level is too low
Operating conditions (discharge pressure, inlet
temperature ...) are different from the expected
ones.
Oil is excessively cold to start the unit
Emercency circuit has not been reset by key
contactor.
Wrong connection for emergency terminals
410-411
Contact 437 is not OFF (0 VAC) when the unit
is stopped
Wrong connection for emergency terminals
410-411
Wrong connection for terminal 435
Wrong internal wiring
13KM8 protection is wrongly set
Faulty noise hood fan
Faulty transducers connection
Oil level transducers damaged
Wirinig problems between CPU and display
Wrong connection for terminal M11
Wrong connection for terminal 437
start
P2 or P3 probes detect pressure > 0 when the
unit is not running
Unit's operated by VFD at a minimum speed
lower than the one indicated in the compressor
instruction manual
Contact 437 is ON (24 VAC) but the unit is not
slippery
running yet
Compressor is set to /F but it's effectively a /S
or a blower
Unit reversely rotates due to backpressure and
a faulty check valve
Cause
No electrical supply
Check the electric supply from the starting panel
Check connection of terminals 430-432 in accordance with
paragraph 4.2
Check connection of terminal 437 in accordance with
paragraph 4.2 withdrawing it from terminal 1270
Contact Robuschi Service
Contact Robuschi Service
Don't use deceleration ramp option to arrest compressor by
VFD.
Belt is unsufficiently tensioned
Contact Robuschi Service
Execute menu P—t Autotuning
Check probe connection and if necessary replace probe.
Contact Robuschi Service
Contact Robuschi Service
Regulate VFD in order to avoid operation of the unit outside
the allowable range
Don't use deceleration ramp option to arrest compressor by
VFD.
Clean the injection valve and regulate it.
Contact Robuschi Service
Improve local air recirculation
Contact Robuschi Service
Revise fan electrical wiring
Check fan operation and eventually replace the fan
Contact Robuschi Service
Refill oil reservoir
Contact Robuschi Service
Pre-heat lubrication oil before starting the unit
Reset emergency circuit by the key contactor on the panel of
the ancillary circuits.
Check connection of terminals 410-411 in accordance with
paragraph 4.2
Check connection of terminal 437 in accordance with
paragraph 4.2 withdrawing it from terminal 1270
Check connection of terminals 410-411 in accordance with
paragraph 4.2
Check connection of terminal 435 in accordance with
paragraph 4.2
Contact Robuschi Service
Verify fan data and set 13KM8 protection
Contact Robuschi Service
Replace fan
Check the connection of the oil level transducer with Sentinel
Replace the transducers
Check connection
Contact Robuschi Service
Contact Robuschi Service
Check connection of terminal 437 in accordance with
paragraph 4.2 withdrawing it from terminal 1270
Restore conditions in discharge pipe or oil circuit
Replace probe if faulty
Regulate VFD in order to avoid operation of the unit outside
the allowable range
Check that the contact 437 is ON only when unit is really
running. If the unit is VFD operated contact 437 should not be
ON with VFD powered and unit stopped.
Contact Robuschi Service
Replace check valve
Format smart-key
Remedies
43
W3-0A5 12-I
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