Wilo TR/E 216 Serie Instrucciones De Instalación Y Funcionamiento página 25

6.5.2 Maintenance work
6.5.2.1 Checking insulation resistance of
the motor winding
6.5.2.2 Checking resistor in the tempera-
ture sensor
6.5.3 Connection of the three-phase AC
motor
6.5.4 Connection of the monitoring de-
vices
Installation and operating instructions Wilo-EMU TR/TRE 216 ... 326-3
Installation and electrical connection
Motor protection switch
For products supplied without a plug, a motor protection switch must be installed on-site.
The minimum requirement is a thermal relay/motor protection switch with temperature
compensation, differential triggering and an anti-reactivation device, in accordance with lo-
cal regulations. Further protection devices (e.g. overvoltage, undervoltage, or phase-failure
relay etc.) must be provided on-site for sensitive power supplies.
Residual-current device (RCD)
ƒ
Install residual-current device (RCD) according to the regulations of the local energy sup-
ply company.
ƒ
If contact with the product and conductive liquids is possible, install residual-current de-
vice (RCD).
ƒ
Check the insulation resistance of the motor winding.
ƒ
Test the resistance of the temperature sensor.
‡
Insulation tester 1000 V
1. Check the insulation resistance.
⇒ Measured value at initial commissioning: ≥ 20 MΩ.
⇒ Measured value at interval measurement: ≥ 2 MΩ.
▶ Insulation resistance checked. If the measured values deviate from the specifications,
consult the customer service.
‡
Ohmmeter available.
1. Measure the resistance.
⇒ Measured value Bimetallic strip: 0 ohms (passage).
⇒ Measured value 3x PTC sensor: between 60 and 300 Ohm.
⇒ Measured value 4x PTC sensor: between 80 and 400 Ohm.
▶ Resistance checked. If the measured value deviates from the specification, consult the
customer service.
ƒ
Connection cable with bare cable ends.
ƒ The supplied connection diagram contains detailed information about the connection
cable:
–
Cable version
–
Wiring diagram
ƒ
Connect the connection cable to the on-site control.
Wiring diagram of the direct starting power connection
U, V, W Mains connection
Polyethylene Ground
(gn-ye)
Wiring diagram of the power connection for star-delta starting
U1, V1, W1 Mains connection (start of winding)
U2, V2, W2 Mains connection (end of winding)
Polyethylene Ground
(gn-ye)
ƒ
Refer to the attached connection diagram for more precise details regarding the version.
ƒ
The individual wires are designated according to the connection diagram. Do not cut the
wires! There is no additional assignment between the wiring diagram and connection di-
agram.
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