Wilo Rexa PRO Instrucciones De Instalación Y Funcionamiento página 178

en
13.2.4 Electrical connection
13.2.4.1 Monitoring of motor compart-
ment
13.2.4.2 Monitoring of motor winding
178
Appendix
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, Divi-
sion 2 is also permitted.
DANGER
Risk of death due to electrocution!
Improper conduct when carrying out electrical work can lead to death due to electric
shock! Electrical work must be carried out by a qualified electrician in accordance
with the locally applicable regulations.
▪ Always connect the pump to an electrical outlet outside the explosive area. If the con-
nection must be made within the explosive area, then the connection must be carried
out in an Ex-rated housing (ignition protection class according to DIN EN 60079-0)!
Non-observance may lead to fatal injury due to explosion! Connection must always be
carried out by a qualified electrician.
▪ All monitoring devices outside the "spark-proof areas" must be connected via an in-
trinsically safe circuit (e.g. Ex-i relay XR-4...).
▪ The voltage tolerance may not be higher than max. ±10 %.
Overview of monitoring devices:
Internal monitoring devices
Motor compartment
Motor winding: Temperature limiter
(1-circuit temperature monitoring)
Motor winding: Temperature controller
(2-circuit temperature monitoring)
External monitoring devices
Sealing chamber
Key: - = not available/possible, o = optional, • = as standard
All the monitoring devices fitted must always be connected!
The connection is made as described in the "Electrical connection" section.
DANGER
Risk of explosion due to overheating of the motor!
If the temperature limiter is connected incorrectly, there is a risk of explosion due to
overheating of the motor! Always connect the temperature limiter to a manual re-
activation lock. This means that a "release button" must be manually activated!
The P 13 motor is equipped with a temperature limiter (1-circuit temperature monitor-
ing). As an option, the motor can be fitted with a temperature controller and limiter (2-
circuit temperature monitoring).
The P 17 motor is equipped with a temperature controller and limiter (2-circuit tem-
perature monitoring).
Depending on the version of the thermal motor monitoring, the following triggering
status must occur when the threshold value is reached:
▪ Temperature limiter (1 temperature circuit):
When the threshold is reached, deactivation with reactivation lock must take place!
▪ Temperature controller and limiter (2 temperature circuits):
P 13 P 17
• o
• o
o •
o o
WILO SE 2019-02