Wilo EMU TR 50-2 Serie Instrucciones De Instalación Y Funcionamiento página 310

en
Internal monitoring devices
Motor compartment/sealing chamber*
Motor winding**
External monitoring devices
Pre-chamber
6.5.4.1 Motor compartment/sealing
chamber monitoring
6.5.4.2 Monitoring of motor winding
310
Installation and electrical connection
DANGER
Risk of explosion due to incorrect connection!
If the monitoring devices are not connected correctly, there is a risk of fatal injury
due to explosion in potentially explosive areas! Connection must always be carried
out by a qualified electrician. If used in potentially explosive areas:
• Connect the thermal motor monitoring via an evaluation relay!
• Deactivation by the temperature limiter must be conducted with reactivation
lock! It must only be possible to restart the unit when the unlock key has been
actuated by hand!
• Connect the external electrode (e.g. sealing chamber control) via an evaluation
relay with an intrinsically safe circuit!
• Note the additional information in the chapter on potentially explosive areas
found in the appendix of these installation and operating instructions!
Overview of possible monitoring devices:
o o
• •
o o
Legend
− = not available/possible, o = optional, • = standard
* In the Ex version, this monitoring is omitted and not substituted!
** A temperature limiter is fitted as standard. The Ex version as per ATEX also features
an installed temperature controller and limiter.
Connect the electrodes via an evaluation relay. Relay "NIV 101/A" is recommended for
this. The threshold is 30 kOhm.
Wiring diagram
Electrode connection
DK
The system must be deactivated when the threshold is reached!
With bimetallic strips
Directly connect bimetallic strips to the switchgear or via an evaluation relay.
Connection values: max. 250 V (AC), 2.5 A, cos φ = 1
Wiring diagram for bimetallic strip
Temperature limiter
20, 21 Bimetallic strip connection
Temperature controller and limiter
High temperature connection
21
Centre terminal
20
Low temperature connection
22
o −
• •
o o
o −
• •
o o
WILO SE 2019-01