Operation In An Explosive Atmosphere; Before Switching On - Wilo Rexa PRO Serie Instrucciones De Instalación Y Funcionamiento

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7.4 Operation in an explosive atmos-
phere
7.5

Before switching on

32
Commissioning
Checking the direction of rotation
A qualified electrician checks the rotating field on the mains connection with a rotating field
test device. For the correct direction of rotation, a clockwise rotating field on the mains
connection must be present. The pump is not approved for operation with a counter-clock-
wise rotating field! CAUTION! If the direction of rotation is checked with a test run, ad-
here to the environmental and operating conditions!
Incorrect direction of rotation
If the direction of rotation is incorrect change the connection as follows:
▪ For motors in direct starting swap two phases.
▪ For star-delta activation motors swap the connections of two windings (e.g. U1/V1 and U2/
V2).
DANGER
Risk of explosion due to flying sparks in the hydraulics!
During operation, the hydraulics must be flooded (completely filled with the fluid). If the
volume flow is interrupted or the hydraulics emerges, air cushions can form in the hy-
draulics. If this happens, there is a risk of explosion e.g. flying sparks due to static charge!
Dry-running protection must ensure that the pump is deactivated at the appropriate
level.
ATEX approval
FM approval
CSA-Ex approval
Legend: - = not available/possible, o = optional, • = as standard
For use in explosive atmospheres, the pump must be marked as follows on the rating plate:
▪ "Ex" symbol for the relevant approval
▪ Ex classification
For the relevant requirements, refer to the explosion protection chapter in the appendix
of these installation and operating instructions!
ATEX approval
The pumps are suitable for operation in potentially explosive atmospheres:
▪ Device group: II
▪ 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:
▪ Protection class: Explosionproof
▪ Category: Class I, Division 1
Notice: If the cabling is carried out according to Division 1, installation in Class I, Division 2 is
also permitted.
Before switching on check the following points:
▪ Check that the installation has been performed correctly and according to the locally appli-
cable regulations:
– Pump connected to electrical ground?
– Has the routing of the power supply cable been checked?
– Has the electrical connection been carried out in line with the regulations?
– Are mechanical components correctly attached?
▪ Check the level control device:
P 13
•
•
-
P 17
•
•
-
WILO SE 2019-02