Three-Phase Motor Connection - Wilo FKT 63.1 Einbau- Und Betriebsanleitung

6.5.2.3 Testing the resistor of the ex-
ternal electrode for sealing cham-
ber control
6.5.3

Three-phase motor connection

6.5.4 Monitoring equipment connection
Installation and operating instructions Wilo Motor FKT 50.1, 57, 63.1, 63.2 + EMU FA
Installation and electrical connection
– With three sensors in series, the measured value range is from 60 to 300 ohms.
– With four sensors in series, the measured value range is from 80 to 400 ohms.
▪ Pt100 sensor: Pt100 sensors have a resistance value of 100 ohms at 0 °C (32 °F).
Between 0 °C (32 °F) and 100 °C (212 °F), the resistance increases by 0.385 ohms per
1 °C (1.8 °F) increase.
At an ambient temperature of 20 °C (68 °F), the resistance is 107.7 ohms.
Measure the resistor of the electrode with an ohmmeter. The measured value must ap-
proach "infinity". For values ≤ 30 kOhm, if there is water in the oil – change the oil!
The three-phase current version is supplied with bare cable ends. Connection to the
mains is established by connecting the power supply cables in the switchgear. Refer to
the attached connection diagram for more precise details regarding the connection.
Electrical connection must always be carried out by a qualified electrician!
NOTICE! 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 diagram.
Wiring diagram of the power connections for direct activation
Mains connection
U, V, W
PE (green-yel- Earth
low)
Wiring diagram of the power connections for star-delta starting
Mains connection (start of winding)
U1, V1, W2
Mains connection (end of winding)
U2, V2, W2
PE (green-yel- Earth
low)
Refer to the enclosed connection diagram for details regarding the connection and in-
stallation of the monitoring devices. Electrical connection must always be carried out
by a qualified electrician!
NOTICE! 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 diagram.
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:
Internal monitoring devices
Terminal room/motor compart-
ment
Motor winding
Motor bearings
FKT 50.1 FKT 57 FKT 63.1
• • •
• • •
o o o
en
FKT 63.2
•
•
o
187