DROPSA SMART3 User Manual

18
The timing chart below shows how to interface the logic with your PLC.
9.3 DIAGNOSTICS
A diagnostics table is provided below that indicates the main anomalies, the probable causes and the possible solutions.
If you were not able to solve the problem after consulting the diagnostics table, do not try to find the fault by disassembling
machine parts but contact the Dropsa technical office and report the anomalies that have been discovered, with a detailed
description.
DIAGNOSTICS TABLE
PROBLEMS
PROBABLE CAUSES
ACTIONS
The pump does
not deliver oil
 It intakes air because the tank is empty
 The intake filter is dirty or clogged
 The internal fittings are loose or broken
 The motor rotates backward
 Restore the level in the tank and bleed the air from the system
 Wash the filter with petroleum and blow with compressed air
 Carefully close all the fittings, making sure there are no leaks and
replace the broken pipes.
 Correctly connect the motor, inverting the direction of rotation
The pump does
not deliver oil at
the required
pressure
 Pump deteriorated
 Pressure control valve uncalibrated set too
low (therefore the oil returns immediately
to the tank).
 Release valve damaged
 Adjustment valve incorrectly calibrated
 Presence of dirt in the by-pass valve
 Replace the pump
 Tighten the adjustment screw until oil comes out of the delivery pipe
 Replace the by-pass valve
 Connect a pipe that is approx. 30 cm long to the pump outlet with a
pressure gauge applied to the free end. Adjust the valve by turning
the screw and reading the corresponding pressure value on the
pressure gauge
 Remove the components and wash them with petroleum. Before
reassembling the components, check the wear status of the O-ring.
Replace the entire assembly if necessary
Line pressure not
released
 Control valve with irregular operation
 Disassemble and clean the by-pass valve, replace the valve if
necessary
Emptying of the
main system line
during the pause
time
 Pump or system outlet fittings loosened
 Non-return or release valve dirty
 Tighten the fittings
 Disassemble and clean the by-pass valve, replace the valve if
necessary
Lubrication cycle
not performed
Cycle control pressure switch calibration
pressure not reached due to:
 Line pipe broken or loose fittings
 Pressure switch calibrated higher than the
pump
 The pump does not deliver oil at the
required pressure
 The pump does not deliver oil
 Replace the pipe - fully tighten the fittings
 Correctly calibrate the pressure switch
 See the diagnostics table
 See the diagnostics table
Alarm code= number of (T1+T2)
T1= 500ms = alarm contact activation time
T2= 500ms = alarm contact deactivation time
TWait= 2000ms= pause time before repetition of same alarm code

DROPSA SMART3 Specifications

General

Brand	DROPSA
Model	SMART3
Category	Water Pump
Language	English