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11 - STANDARD MAINTENANCE
11.4 - Tightening of the electrical connections
11.4.1 - Tightening torques for the main electrical connections
Screw type
Designation in the unit
Torque value, N•m
Screw on bus bar, customer connection
M10
L1/L2/L3
40
M12
L1/L2/L3
70
Soldered screw PE, customer connection (M12)
PE
70
Screw on fused disconnect inlet zones
Fused disconnect 1034061/M10, customer connection L1/L2/L3
L1/L2/L3
40
Fused disconnect 1034061/M12, Y/D outlet
QS10-
70
Fused disconnect 3KL7141
QS10-
70
Fused disconnect 3KL7151
QS10-
70
Tunnel terminal screw, compressor contactor
Contactor 3RT104-
KM-
5
Contactor 3RT105-
KM-
11
Contactor 3RT106-
KM-
21
Tunnel terminal screw, current transformer
Size 2 (3RB2966-)
TI-
11
Compressor earth terminal in the power wiring control box
M12
Gnd
70
Compressor phase connection terminals
25
M12
1/2/3/4/5/6 on EC-
23
M16
1/2/3/4/5/6 on EC-
30
Compressor earth connection
Gnd on EC-
25
Tunnel terminal screw, water pump disconnect
Disconnect switch 3RV101-
QM90-
2,5
Disconnect switch 3RV102-
QM90-
2,5
Disconnect switch 3RV103-
QM90-
4
Tunnel terminal screw, water pump contactor
Contactor 3RT102-
KM90-
2,5
Contactor 3RT103-
KM90-
4
11.4.2 - Connection precautions for the compressor
power terminals
These precautions must be applied during an intervention that
requires the removal of the power conductors connected to the
compressor supply terminals.
The tightening nut of terminal (6) supporting the isolator (7) must
never be loosened, as ist ensures terminal tightness and
compressor leak tightness.
The tightening of phase lug (4) must apply the torque between
counter nut (5) and tightening nut (3): during this operation a
counter-torque must be applied at counter nut (5). Counter-nut (5)
must not be in contact with the tightening nut of terminal (6).
Legend
1. Torque application to tighten
the lug
2. Avoid contact between the
two nuts
3. Lug tightening nut
4. Flat lug
5. Counter-nut
6. Terminal tightening nut
7. Isolator
11.4.3 - Connection precautions for the power contactors
These precautions must be applied for the circuit equipped with
06TVW819 or 06TVA680 compressors. For this compressor, the
power contactor type is 3RT1064 (Siemens).
The contactors allow two connection positions in the cage clamps.
But only one position allows safe and reliable tightening on the
contactor (KM1 or KM2). The conductor must be positioned in
front of the connection area when it is tightened. If it is tightened
behind the area, there is a risk that the brackets will be damaged
during the tightening.
Conductor position NOT ALLOWED
COMPULSORY conductor position