Wilo Rexa PRO Serie Instrucciones De Instalación Y Funcionamiento página 30

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• Voltage tolerance: ±10%
• All monitoring devices outside the "spark-proof
areas" must be connected via an Ex cut-off relay.
We recommend the XR-42x relay for this.
Temperature monitoring device connection
The motor is equipped with a temperature limiter
(1-circuit temperature monitoring).
As an option, the motor can be fitted with a tem-
perature controller and limiter (2-circuit tempera-
ture monitoring).
RISK of fatal injury due to incorrect connection!
Risk of explosion due to overheating of the mo-
tor! The temperature monitoring device must be
connected in such a way that, when triggered,
a restart is possible only after the "release but-
ton" is pressed by hand.
In 2-circuit temperature monitoring, automatic
restarting can be implemented via the temperature
control. The maximum switching frequency (15/h
with a 3-minute pause) must be observed.
• Bimetallic strips must be connected via an evalua-
tion relay. We recommend the "CM-MSS" relay for
this. The threshold is already preset.
Connection values: max. 250 V(AC), 2.5 A, cos φ = 1
• PTC sensors (optionally available and in accordance
with DIN 44082) must be connected via an evalua-
tion relay. We recommend the "CM-MSS" relay for
this. The threshold is already preset.
When the threshold is reached, the pump must
switch off.
Motor compartment monitor
• The motor compartment monitor must be con-
nected via an evaluation relay. We recommend the
"NIV 101/A" relay for this. The threshold is 30 kΩ.
When the threshold is reached, the pump must
switch off.
Connection of sealing chamber control
• The pencil electrode must be connected via an
evaluation relay. We recommend the "XR-42x" relay
for this. The threshold is 30 kΩ.
• The connection must be made using an intrinsically
safe electric circuit.
The following connection values must be complied
with:
• Max. 30 Vrms (60 V peak)
• Max. 60 VDC
• Max. 0.5 mA
Operation on variable frequency drive
• Continuous operation up to rated frequency
(50 Hz or 60 Hz), observing the min. flow rate
• Consider additional measures with regard to EMC
(choice of variable frequency drive, using filters,
etc.).
30
• Never exceed the rated current or rated speed of
the motor.
• It must be possible to connect the motor's own
temperature monitor (bimetallic strip or PTC
sensor).
10.2.5. Commissioning
RISK of fatal injury due to explosion!
Pumps without Ex marking must not be used
in potentially explosive areas! There is a risk
of fatal injury due to explosion! Observe the
following when using the pump in explosion
hazard areas:
• The pump must be approved for use in potential-
ly explosive areas!
• The power supply cable must be connected
outside the potentially explosive area, or inside
a housing with an approved level of ignition
protection.
• Switchgear must be connected outside the
potentially explosive area, or inside a housing
with an approved level of ignition protection.
Furthermore, it must be configured for operation
of pumps with explosion approval.
• The mounted accessories must be approved for
use on Ex pumps.
RISK of fatal injury due to explosion!
The housing of the hydraulics must be fully
flooded (completely filled with the fluid) during
operation. If the housing is not immersed or
there is air in the hydraulics, flying sparks may
cause an explosion, for example due to static
charge. Ensure that dry-running protection is in
place for pump deactivation.
In addition to the information in the "Commission-
ing" section, note the following points for Ex-rated
pumps:
• The end user is responsible for defining the poten-
tially explosive area. Only pumps with Ex approval
may be used within a potentially explosive area.
• Ex-rated pumps must be identified accordingly.
• To keep dry motors sufficiently cooled, after being
removed from immersion, they must be flooded
completely before being switched back on!
10.2.6. Maintenance and repair
ELECTROCUTION hazard!
There is a risk of fatal electric shocks when
performing work on electrical devices. With all
maintenance or repair work, the pump must be
disconnected from the power supply and se-
cured against being switched on again without
permission. Damage to the power supply cable
may only be rectified by a qualified electrician.
APPENDIX
WILO SE 2014-11 V05 Letter