Wilo Rexa UNI Series, Installation And Operating Instructions Manual

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en Commissioning
48 WILO SE 2019-02
– Float switches can move freely?
– Switching level tested (pump on, pump off, minimum
water level)?
– Additional dry-running protection installed?
▪ Test operating conditions:
– Min./max. temperature of the fluid tested?
– Max. immersion depth tested?
– Operating mode defined depending on the minimum
water level?
– Maximum switching frequency adhered to?
▪ Check installation location/operating space:
– Pipe system on the pressure side free of deposits?
– Inlet or pump sump cleaned or free of deposits?
– All gate valves open?
– Minimum water level defined and monitored?
The hydraulics housing must be filled completely with
the fluid and there must be no air cushions in the hy-
draulics. NOTICE! Provide suitable venting devices if
there is a risk of air cushions being formed in the
system!
7.5 Switching on and off
During the start process, the rated current is temporarily
exceeded. During operation, the rated current may no
longer be exceeded. CAUTION! If the pump does not
start, switch off the pump immediately. Remove the
fault before reactivating the pump!
Place pumps which are installed as portable pumps on a
firm surface so they are level. If pumps have fallen over,
place them upright again before activating them. Se-
curely attach the pump with screws in case of difficult
surfaces.
Pump with attached float switch and plug
▪ Single-phase current version: After inserting the plug
into the socket, the pump is ready for operation. The
pump is switched on and off automatically depending on
the fill level.
▪ Three-phase current version: After inserting the plug
into the socket, the pump is ready for operation. The
pump is controlled via two switches on the plug:
– MANUAL/AUTO: Determines if the pump is switched
on and off directly (MANUAL) or depending on the fill
level (AUTO).
– ON/OFF: Switch pump on and off.
Pump with attached plug
▪ Single-phase current version: After inserting the plug in
the socket, the pump is switched on.
▪ Three-phase current version: After inserting the plug
into the socket, the pump is ready for operation. The
pump is switched on and off with the ON/OFF switch.
Pumps with bare cable end
The pump must be switched on and off using a separate
operating point (on/off switch, switchgear) provided by
the customer.
7.6 During operation
WARNING
Amputation of limbs due to rotating compon-
ents!
No persons must be present in the work area of the
pump! There is risk of (serious) injuries due to rotating
components! No persons must be present in the work
area of the pump during start-up or operation.
WARNING
Risk of burns from hot surfaces!
Motor housing can become hot during operation. It
may cause burns. Allow the pump to cool down at
ambient temperature after switching it off!
NOTICE
Pumping problems due to water level being
too low
The hydraulics are self-venting. Smaller air cushions
are resorbed during pumping. If the fluid is lowered
too much, separation of the volume flow may occur.
The minimum permissible water level must reach the
upper edge of the hydraulics housing!
When operating the pump, observe the locally applicable
regulations on the following topics:
▪ Work safety
▪ Accident prevention
▪ Handling electrical machines
Strictly adhere to the responsibilities of the personnel
specified by the operator. All personnel are responsible
for ensuring that the responsibilities of the personnel
and the regulations are observed!
Due to their design, centrifugal pumps have rotating
parts that are easily accessible. Depending on the oper-
ating condition, sharp edges can develop on these parts.
WARNING! This can lead to cuts and limbs may be
severed! Check the following at regular intervals:
▪ Operating voltage (+/-10 % of the rated voltage)