Wilo FKT 50.1 - Before Switching on; Switch on and off; During Operation

en Commissioning
30 WILO SE 2019-01
ƒ “Ex” symbol of the corresponding approval
ƒ Ex classification
For the relevant requirements, refer to the explosion protection chapter in the ap-
pendix of these installation and operating instructions!
ATEX approval
The pumps are suitable for operation in potentially explosive atmospheres:
ƒ Device group: II
ƒ Category: 2, zone 1 and zone 2
These pumps must not be used in zone 0!
FM approval
The pumps are suitable for operation in potentially explosive atmospheres:
ƒ Protection class: Explosionproof
ƒ Category: Class I, Division 1
Notice: If the cabling is carried out according to Division 1, installation in Class I, Di-
vision 2 is also permitted.
7.5 Before switching on
Check the following prior to activation:
ƒ Check whether the device has been installed properly and in accordance with the
locally applicable regulations:
– Has the pump been earthed?
– Layout of power supply cable tested?
– Electrical connection made properly?
– Mechanical components attached correctly?
ƒ Check level control:
– Float switches can move freely?
– Switching level tested (pump on, pump off, minimum water level)?
– Additional dry-running protection installed?
ƒ 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?
ƒ 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 hydraulics. NOTICE!Provide suitable venting devices if
there is a risk of air cushions being formed in the system!
7.6 Switch 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!
The pump must be switched on and off using a separate operating point (on/off switch,
switchgear) provided by the customer.
7.7 During operation
DANGER
Risk of explosion due to overpressure in the hydraulics!
If the gate valves on the suction and pressure sides are closed during operation, the
fluid in the hydraulics housing is heated up by the pumping movement. This heating
creates a pressure of several bars in the hydraulics. The pressure can result in the
pump exploding! Make sure that all gate valves are open during operation. Open
closed gate valves immediately!