Table 26: Tightening torques of the terminals
Frame
Type
Tightening torque:
the mains cable and
motor cable terminals
Tightening torque:
the grounding clamps
for cable shield
Tightening torque:
the grounding clamps
for grounding conductor
[Nm]
lb-in.
[Nm]
lb-in.
[Nm]
lb-in.
MR8
0140 2 - 0205 2
0140 5 - 0205 5
0080 6 - 0125 6
0080 7 - 0125 7
30
266
1.5
13.3
20
177
MR9
0261 2 - 0310 2
0261 5 - 0310 5
0144 6 - 0208 6
0144 7 - 0208 7
40
266
1.5
13.3
20
177
5.7
INSTALLATION IN A CORNER-GROUNDED NETWORK
You can use corner grounding with the drive types (MR7 to MR9) with a rating of 72-310 A
with a 380-480 V mains, and 75-310 A with a 208-240 V mains.
In these conditions, you must change the EMC protection level to C4. See the instructions in
7.6 Installation in an IT system.
Do not use corner grounding with the drive types (MR4 to MR6) with a rating of 3.4-61 A with
a 380-480 V mains, or 3.7-62 A with a 208-240 V mains.
Corner grounding is allowed for the MR4-6 drives (main voltage 208-230 V) up to 2000 m.
VACON · 88
POWER CABLING
5
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