ABB ACH580-01 - Page 167

IT systems (un-
grounded or high-
resistance groun-
ded [>30 ohms])
(C)
Corner-grounded
(B1) and midpoint-
grounded delta
systems (B2)
≤ 600 V
Symmetrically
grounded TN sys-
tems (TN-S sys-
tems) ie. center-
grounded wye (A)
Factory
default
screw
material
Screw la-
bel
Frame
size
Do not disconnect
the plastic screw
2)
Do not disconnect
the plastic screw
2)
Optional metal
screw
1)
PlasticEMC (DC)R1…R3
R4 v2
Remove the metal
screw
Remove the metal
screw
Do not disconnect the
metal screw
MetalVAR
Do not disconnect
the plastic screw
2)
Do not disconnect
the plastic screw
2)
Optional metal
screw
1)
PlasticEMC (AC)
R4…R9
3)
Do not disconnect
the plastic screw167
Do not disconnect
the plastic screw
2)
Optional metal
screw
1)
PlasticEMC (DC)
Remove the metal
screw
Do not disconnect
the metal screw
Do not disconnect the
metal screw
MetalVAR
Drive Drive
PE
L3
L2
L1
L3
L2
L1
Drive
PE
L3
L2
L1
B1 C
B2
PE
L2
L3
L1
N
Drive
A
1)
You can install metal screw and connect the EMC filter if you are concerned with EMC issues.
2)
Metal screw must not be used, plastic screw may be maintained or removed from the AC EMC circuit.
3)
Frames R4 and R5 are evaluated for use on corner-grounded delta networks by UL standards. (R4 and R5
frames are not to be used on IEC installations of corner grounded networks.)
Note: The VAR screw on R1…R3 also connects the EMC (AC) circuit internally within
the drive.
Note: Failure to remove a metal screw, when indicated in the table above, may result
in drive failure.
Electrical installation – North America 167