Operation In An Explosive Atmosphere; Before Switching On - Wilo Flumen OPTI-TR 20-1 Instrucciones De Instalación Y Funcionamiento

Fig. 12: Correct direction of rotation
7.4 Operation in an explosive atmos-
phere
7.5

Before switching on

Installation and operating instructions Wilo-Flumen OPTI-TR 20-1, 28-1, 30-1, 40-1 Wilo-Flumen EXCEL-TRE 20, 30, 40
Commissioning
Checking the direction of rotation
‡
Mains connection with clockwise rotating field present.
‡
Rotating field inspected by a qualified electrician.
‡
No persons are allowed in the working area of the mixer.
‡
Mixer firmly installed.
WARNING! Do not touch mixer with hands! The high starting torque can lead to seri-
ous injuries!
‡
Propeller is visible.
1. Switch mixer on. Max. operating duration: 15 s!
2. Direction of propeller rotation:
View from front: The propeller rotates counter-clockwise (to the left).
View from behind: The propeller rotates clockwise (to the right).
▶ Direction of rotation is correct.
Incorrect direction of rotation
If the direction of rotation is incorrect change the connection as follows:
▪ Direct starting: swap two phases.
▪ Star-delta starting: swap connections of two windings (e.g. U1/V1 and U2/V2).
NOTICE! After changing this connection, check the direction of rotation again!
Approval accord-
ing to
o
ATEX
o
FM
−
CSA-Ex
Legend
− = not available/possible, o = optional, • = standard
For use in explosive atmospheres, the mixer 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 mixers are suitable for operation in potentially explosive atmospheres:
▪ Device group: II
▪ Category: 2, zone 1 and zone 2
Mixers must not be used in zone 0!
FM approval
The mixers 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:
− o o
− o o
− − −
en-US
o o o
o o o
− − −
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