Operating Faults - Wilo Economy MHIE 1-Serie Einbau- Und Betriebsanleitung

6.4 Starting
Depending on the temperature of the fluid and
on the operating cycles of the pump, the sur-
face temperature (pump, motor) may exceed
68°C: mount suitable personnel protection
apparatus as needed.
The pump should not be permitted to be
ATTENTION!
operated longer than ten minutes with
zero flow when the gate valve is closed
on the pressure side.
We recommend that a minimum flow level of
approximately 10% of the nominal throughput of
the pump be maintained in order to ensure that
no blow hole forms in the upper part of the pump.
- Open the stop valve on the pressure side and start
the pump.
- Check the uniformity of the pressure on the
discharge side with the aid of a pressure gauge;
bleed the pump again or refill it in the event of
deviations.
- Check current consumption. The current con-
sumption may not exceed the specification on
the pump shield.

8 Operating faults

De-energise the pump before each intervention and secure against non-authorised restarts!
ATTENTION!
All of the incidents listed below will lead to a switch-off via the error relay
Display
Reaction time
Green Red up to standstill
Led Led Frequency
converter
Immediate
Off On
Off On Immediate
Immediate
Off On
Off On < 60 s
Off On < 15 s
Off On < 60 s
If the pump is at a complete standstill and an intervention is required, disconnect the power supply, wait until the LEDs have gone out completely, eliminate the fault
and reconnect the power supply. If a major fault is present, then an after-sales service employee must be called in.
If the fluid is toxic, corrosive or hazardous for
personnel, then WILO or the authorised repair
company must be informed of the situation.
Clean the pump in such cases in order to ensure
absolute safety for the craftsmen performing
the repairs.
Installation and operating instructions - Wilo-Economy MHIE 1~
Frequency converter behaviour
Waiting time
Number of
before
automatic
switching
re-start
back on
3 60 s
3 60 s
3 60 s
3 60 s
0 /
3
60 s
7 Maintenance
The pump(s) must be de-energised and
ATTENTION!
all non-authorised restarts must be pre-
vented before any maintenance work is
done.
Never undertake maintenance work while the
pump is running. Always keep pump and motor/
frequency converter in clean condition.
When set up in frost-free locations, the pump
should not be emptied, even with prolonged
decommissioning.
To prevent blockage of the shaft and of the
hydraulic apparatus, the pump is to be emptied
during periods of potential frost by unscrewing
the drainage and inlet/bleeding screw (Fig. 1+2,
Pos. 5+6). Screw both screws back in without
tightening them.
Replacement frequencies
NOTE: These can only be regarded as recommen-
dations, because the frequency of replacement
is dependent on operating conditions within the
group involving
• Temperature, pressure and quality of the fluid for
the mechanical seal.
• Pressure and ambient temperature for the motor
and other components.
• Frequency of start-up: continuous or intermittent
operation.
Relay status
Fault/possible causes
Contact –
Failure contact
Frequency converter supply
Open
has undervoltage
Frequency converter supply
Open
has overervoltage
Open The motor has a shortcircuit
Open The pump is overloaded
The pump is deactivated or is
Open
running dry
The sensor cable (4-20 mA) is
Open
disconnected (only Mode 2)
If the operating fault cannot be rectified, then please
contact your local professional tradesmen or the Wilo
after-sales service in your vicinity.
English
Elimination
Check voltage at the
terminals of the frequency
converter
Check voltage at the
terminals of the frequency
converter
Dismantle motor/
frequency converter of the
pump and have it checked
or replace it
Excessive density and/or
viscosity of the pumped
fluid
Re-prime by filling
the pump. Check the
impermeability of the foot
valve
Check correct current
supply and cabling of the
sensor
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