17
ARCHIMEDE LCD SERIES - ENG
ELECTROIL
4
Pressure Transducer don’t
measure the correct
pressure value (error > 1
Bar)
Check if the pressure transducer is connected on the delivery of the pump on a
correct position, not so close to the impellers and before the valve to close the
flow.
5
Pressure Transducer
measure a pressure too
high when the motor is
running then the Inverter
reduce the motor velocity at
the minimum value (low
frequency)
Check that the pressure cable is separated from the motor cable, that is a
source of noise; specially when the cable of the pressure transducer is too long
(long distance between inverter and motor) it’s very important to use a shielded
type two wire cable, as far as possible to the motor supply cable. Connect the
shield to ground only on one terminal, if possible connect it directly on a metal
screw to ground near the motor.
6
The Inverter cannot work
because remain in Pressure
Transducer Problem alarm
condition
Check If the wires of the pressure transducer are correctly connected brown on
+, white on S contact on the board.
Check wiring connection on the cable of the pressure transducer.
Warning: In case you need to cut the pressure transducer cable to add a
longer cable be sure to switch off the inverter at least 1 minute before to cut
this cable, otherwise you can cause a short circuit on the transducer input of
the electronic board (damage) if the internal capacitors are not totally
discharged.
7
The distance between
Pressure transducer and
Pump is high (long pipe)
and the pressure
continuously go up and
down
You must reduce the velocity of the feedback control reducing the Proportional
factor and the Integral factor (Advanced Functions -> P.I.D. Factors). Try to set
these values to half and test the system, then, if not enough, reduce more and
test again until the pressure control remain stable.
8
The Inverter stop the motor
for Minimum Flow with a
high flow condition and then
re-start and stop again,
continuously
A small water membrane Tank charged with 1.5-2 Bar air pressure is required
for a correct working; check it.
The condition may also caused by a not correct pump curve saving during the
automatic check: possibly the delivery was not totally closed and the Inverter
checked a higher curve of the pump; repeat the automatic check (Pump data -
> check ON, then exit to the menu and press START) closing totally the outlet
and try again the functioning.
Verify if there is a no-return inlet valve on the pump and if it’s working good
without loses.
It’s possible to reduce the flow before stopping reducing the parameter F1
It’s possible to reduce the flow before stopping reducing the parameter
Minimum Flow Power stop % on Motor Data.
9
The inverter don’t switch off
the pump when the valve on
delivery is totally closed
Probably check was done with pump not perfectly filled up; remake the check
procedure after a complete filling of the pump and try again if pump switch off
correctly in minimum flow condition. If the problem remain, try to grow up the
function: Advanced Functions -> Motor data -> Minimum flow power stop,
upgrading 2% every time and testing pump, till find the correct working.
10
The hydraulic system have
a big tank (>40 l) and, after
check did correctly with
closed delivery, the pump
stop for minimum flow with a
high flow, and then re-start
and stop again, continuously
Probably during the automatic check there was a flow of water to full up the big
tank, for that the pump curve saved by the inverter is not the correct curve
(with null flow and maximum pressure).
Maintain full of water the tank (pressure near maximum value); repeat the
automatic check (Pump data -> check ON, then exit to the menu and press
START). When the check finish try to work again testing the minimum flow
stop condition of the motor that must be with a small flow.
11
The Inverter stop the motor
for Dry Working condition
Sometimes the problem is caused by the same Automatic Check error that
previous point (see possible solution like above).
In other cases possibly there is air mixed with the water on the inlet of the
pump (verify pipes and junctions).
12
The pump don’t switch off
for dry working when the
inlet pipe and the pump are
empty
In normal working condition, with pump and pipes filled up, remake a check
procedure (Pump data -> Check=ON) and try again. If the problem remain
grow up the parameter: Motor Data -> Dry Working power stop, from 80%
default value doing 10% steps, testing every time the pump. If the problem
cannot disappear also with Dry working power stop more than 100%, verify
that pump haven’t any defect (fault seal, impellers, etc) that can cause a big
power absorbing also without water, in dry condition.
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