Wilo EMU FA+T Einbau- Und Betriebsanleitung Seite 72

English
• Ex = explosion-protected device complying to
Euro norm
• d = ignition protection type for motor casing:
Pressure-resistant encapsulation
• e = ignition protection for terminals: Increased
safety
• II = intended for places where explosions may oc-
cur, with the exception of mines
• B = intended for use with gases in sub-group B
(all gases excluding hydrogen, acetylene, carbon
disulphide)
• T4 = Max. surface temperature of the device is
135 °C
• Gb = device protection level 'b'
'Pressure-resistant encapsulation' protection
class
Motors in this protection type must be equipped
with a temperature limit.
Certification number
The certification number of the approval is lo-
cated on the rating plate, in your order confirma-
tion as well as on the technical data sheet.
10.3.3. Electrical connection
ELECTROCUTION hazard!
Incorrect electrical connections can cause fa-
tal electric shocks. Electrical connections may
only be carried out by a qualified electrician
approved by the local energy supply company,
in accordance with locally applicable regula-
tions.
In addition to the information in the 'Electrical
connection' section, the following points must be
observed for Ex-rated pumps:
• The power supply cable must be connected
outside the potentially explosive area, or inside a
housing with ignition protection conforming to
DIN EN 60079-0!
• The following voltage tolerances must be com-
plied with:
• T 12 ... T 34: ±10%
• T 42 ... T 56: ±5%
• All monitoring devices outside the 'spark-proof
areas' must be connected via an ex-rated cut-off
relay.
'Motor/terminal compartment monitoring' con-
nection
The connection is made as described in the 'Elec-
trical connection' section.
'Motor temperature monitoring' connection
The motor must be fitted with 1-circuit tempera-
ture monitoring (limit function only).
The motor can optionally be fitted with 2-circuit
temperature monitoring (temperature control and
limit function).
72
RISK of fatal injury due to incorrect connec-
tion!
Risk of explosion due to overheating of the
motor! The temperature monitoring device
must be connected in such a way that, when
triggered, it can only be restarted after the
'release button' has been activated manually!
In 2-circuit temperature monitoring, automatic
restarting can be implemented via the tempera-
ture control. This requires compliance with the
specifications for max. switching frequency and
switching break as stated in the technical data.
• Bimetallic strips must be connected via an evalu-
ation relay. We recommend the 'CM-MSS' relay for
this. The threshold is already pre-set.
Connection values: max. 250 V(AC), 2.5 A, cos φ
= 1
• PTC sensors (in accordance with DIN 44082) must
be connected via an evaluation relay. We recom-
mend the 'CM-MSS' relay for this. The threshold is
already pre-set.
When the threshold for temperature control is
reached, deactivation may be triggered, and when
the threshold for the temperature limit is reached,
deactivation must be triggered.
'Sealing chamber control' connection
• The pencil electrode must be connected via an
Ex-rated evaluation relay! We recommend the
'XR-41x' relay for this. The threshold is 30 kΩ.
• The connection must be made using an intrinsi-
cally safe electric circuit!
'Leakage chamber monitoring' connection
The leakage chamber is monitored by a float
switch. This is equipped with a potential-free
normally closed contact. The switching capac-
ity can be found in the particular connection
diagram.
The float switch must be connected via an evalu-
ation relay! We recommend the 'CM-MSS' relay
for this. The threshold is already pre-set. When
the float switch is triggered, a warning must be
given or the unit switched off.
'Motor bearing temperature monitoring' con-
nection
For design reasons, monitoring of the motor
bearing temperature is possible only on some
motors. Please see the separate data sheet for the
connection.
Frequency converter operation
• 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 frequency converter, using
filters, etc.).
• 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).
WILO SE 07-2015 V05 DIN A4
APPENDIX