en Commissioning
78 WILO SE 2019-10
Incorrect direction of rotation
If the direction of rotation is incorrect, change the connection as follows:
ƒ Swap two phases for motors with direct starting.
ƒ Swap the connections of two windings (e.g. U1/V1 and U2/V2) for star-delta activa-
tion motors.
7.4 Operation in an explosive atmo-
sphere
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 hydraulics. 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.
Asynchronous motor Permanent magnet motor
T 20.2 T 17.3...-P T 20.2...-P
Approval according to IEC-Ex
o o o
ATEX approval
o o o
FM approval
o o o
CSA-Ex approval
− − −
Key
− = Not available/possible, o = Optional, • = Standard
For use in explosive atmospheres, the pump must be marked as follows on the rating
plate:
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?
To Next Page
Loading...
Need help?
General
