DAB PWM II 230 D 4.7 Instructions Pour L'installation Et La Maintenance page 92

7.2 Description of blocks
7.2.1 "BL" Block due to water failure
In flow conditions below minimum value, with pressure lower than the set regulation value, a water failure signal is
emitted and the system shuts down the pump. The delay interval without pressure and flow can be set in the
parameter TB of the TECHNICAL ASSISTANCE menu.
If the user inadvertently enters a pressure setpoint higher than the pressure that the electric pump can supply on
closure, the system indicates "block due to water failure" (BL) even if this is not precisely the problem. In this case,
lower the regulation pressure to a reasonable value, which does not normally exceed 2/3 of the head of the electrical
pump installed.
7.2.2 "BP1" Block due to fault on pressure sensor
If the inverter detects a fault on the pressure sensor, the pump remains blocked and the error signal "BP1" is
displayed. This status starts as soon as the problem is detected and is reset automatically when the correct conditions
are restored.
7.2.3 "LP" Block due to low power supply voltage
Activated when the line voltage on the power supply terminal falls below the minimum admissible voltage. Reset is
only automatic when the voltage on the terminal returns within the specifications.
7.2.4 "HP" Block due to high internal power supply voltage
Activated when the internal power supply values are outside the specified range. Reset is only automatic when the
voltage returns to within the admissible values. This may be due to voltage surges or excessively brusque shutdown
of the pump.
7.2.5 "SC" Block due to direct short circuit between the phases on the output terminal
The inverter is equipped with a protection against direct short circuits, which may occur between the phases of the
output terminal "PUMP". When this block signal is sent, the user can attempt reset by pressing buttons + and –
simultaneously which in any event does not have any effect until 10 seconds has passed since the moment of
the short circuit.
7.3 Manual reset of error conditions
In error status, the user can reset the fault by overriding a new attempt by pressing and releasing buttons + and -.
7.4 Auto-reset of error conditions
In the cases of some malfunctions and block conditions, the system makes a number of attempts at automatic reset of
the electric pump.
The auto-reset system regards in particular:
- "BL" Block due to water failure
- "LP" Block due to low power supply voltage
- "HP" Block due to internal high voltage
- "OT" Block due to overheating of final power stages
- "OB" Block due to overheating of printed circuit
- "OC" Block due to current overload on electric pump motor
- "OF" Block due to current overload on final stages of output
- "BP" Block due to fault on pressure sensor
If, for example, the pump is blocked due to water supply failure, the inverter automatically starts a test procedure to
verify that the unit is effectively without water permanently. During the sequence of operations, if a reset attempt
succeeds (for example water has returned), the procedure is interrupted and normal operation is resumed.
Table 31 shows the sequence of operations performed by the inverter for the different types of block.
ENGLISH
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