Wilo Drain TMT 32M - Level Control and Dry-Running Protection; Electrical Connection Procedures

32 WILOSE04/2014V05DINA4
English INSTALLATION
numberofmotoractivations(switchingcycles)
being exceeded.
5.4.1. Remedies for avoiding excessive switching
cycles
• Manual reset
The motor is switched off when the water level
falls below the minimum coverage level and
switchedbackonwhenasufcientwaterlevelis
reached.
• Separate reactivation point
Asecondswitchingpoint(additionaloateror
electrode)isusedtoobtainasufcientdifference
between the activation and deactivation points.
This prevents constant switching. This function
can be put into effect with a level control relay.
5.5. Electrical connection
ELECTROCUTION hazard!
Incorrect electrical connections can cause fa-
tal electric shocks. Electrical connections may
only be carried out by a qualied electrician
approved by the local energy supply company,
in accordance with locally applicable regula-
tions.
• The mains connection current and voltage must
be as stated on the rating plate.
• Connectthepowersupplycableinaccordance
with the applicable standards and regulations and
according to the conductor assignment.
• Anyavailablemonitoringequipment,e.g.for
thermalmotormonitoring,mustbeconnected
and tested to ensure that it is working properly.
• Forthree-phaseACmotors,aclockwiserotating
eldmustbeavailable.
• Ground the pump properly.
Pumps that are permanently installed must be
grounded in compliance with nationally applica-
ble standards. If a separate grounding conductor
isavailable,itmustbeconnectedtothemarked
hole or earth terminal (;)usingasuitablescrew,
nut,toothedwasherandatwasher.Thecross
section of the cable for the grounding conductor
connection must correspond to the local regula-
tions.
• A motor protection switch must be used for
motors with a free cable end. We recommend
usingaresidual-currentdevice(RCD).
• Switchgears must be purchased as accessories.
5.5.1. Mains fuses
The back-up fuse must be rated according to the
startingcurrent.Youwillndthestartingcurrent
on the rating plate.
Onlyslow-blowfusesorKcharacteristicauto-
matic cut-outs may be used as a back-up fuse.
5.5.2. Checking the insulation resistance and moni-
toring devices before commissioning
Ifthevaluesmeasureddeviatefromthespeci-
cations,moisturemayhavepenetratedintothe
motor or the power supply cable or the monitor-
ing unit may be defective. Do not connect the
pump and consult Wilo customer service.
Insulation resistance of the motor winding
Beforeconnectingthepowersupplycable,the
insulation resistance must be tested. This can be
measured with an insulation tester (measuring
voltage=1000V):
• Oninitialcommissioning:insulationresistance
maynotbelessthan20MΩ.
Temperature sensors
Beforeconnectingthemonitoringdevice,this
must be checked with an ohmmeter. The follow-
ingvaluesmustbecompliedwith:
• Bimetallicstrip:Value=“0”passage
5.5.3. Three-phase motor
Fig. 3.: Connection diagram
L1
Mains connection
DK
Leakagedetectionfor
motor compartment
L2
L3 20
Bimetallic strip
PE Earth 21
The three-phase current version is supplied with
bare cable ends. The connection to the mains is
made at the switchgear.
Electrical connections may only be made by a
qualied electrician!
The wires of the connection cable are assigned as
follows:
7-wire connection cable
Wire number Terminal
1
Temperature monitor for wind-
ing
2
3 U
4 V
5 W
6
Leakagedetectionformotor
compartment
Green/yellow Earth(PE)
5.5.4. Connecting the monitoring devices
Each monitoring device must always be connect-
ed.
Motor temperature monitor
• Bimetallic strips must be connected in the
switchgear itself or via an evaluation relay.
Connectionvalues:max.250V(AC),2.5A,
cosφ=1
• Whenthethresholdisreached,theunitmust
deactivate.
Forthisreason,nowarrantyclaimscanbeaccept-
ed for any damage to the winding resulting from
unsuitable motor monitoring.