Pump stop due to power failure
Stopping the pump by disconnecting the mains power supply is not a normal way to stop
the pump:
● Always send a
‘Stop’
order via the control panel and wait for the pump to stop rotating
before starting work on the product.
When a power failure occurs, the rotor remains suspended by the energy emitted by the motor’s coun-
ter-electromotive force, until the rotor rotation speed is low enough that it can rest on the landing bear-
ings without being damaged.
If the power is restored before the minimum speed is reached, the pump recovers its initial speed with-
out any disturbance. The landing bearing counter does not decrease.
Otherwise, if the minimum speed is reached before the power supply has been restored:
● The pump lands on its landing bearings.
● The electronic drive unit is powered off; no indicator light is on.
● The landing bearings’ counter decreases (see chapter “Maintenance frequency”).
Start up the pump according to the standard start-up procedure when the mains supply has been re-
stored.
6.3.2 Powering off
1. Switch off the pump by setting the main 48 VDC switch to
O
:
– All LEDs on the electronic drive unit are off.
– Wait for the rotor
to completely stop rotating
.
2. Disconnect the pump supply cable from the electronic drive unit.
6.3.3 Prolonged stoppage
If the pump has to be stopped for a prolonged period, follow the shutting down procedure (see chapter
"Shutting down for longer periods").
6.4 Operation monitoring
When a problem occurs, the user is warned by:
● Activation of the fault/warning LED
● Audible warning of the HHR (if enabled)
● Activation of the fault contacts on the
Remote
connector
● Pumping interruption when the
‘Stop’
order has not been activated
● Fault/warning message displayed on the HHR
● A message via the RS-232 or RS-485 serial link
● A message via the fieldbus
Fault messages are listed in chapter "Malfunctions".
LED
Sym-
bol
LED status
Display
Meaning
Gree
n
off
Switched off
on, flashing 10%
Power supplied. Pump stopped or rotation
speed < 60 min
-1
.
on, flashing 90%
The pump has not reached the selected
speed.
on, constant light
The pump has reached the selected speed.
on, flashing 50%
The pump speed decreases, speed
> 60 min
-1
.
Yel-
low
off
No warning
on, constant light
Electronic drive unit initialized or warning sig-
naled
Operation
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