ABB ACS580-07 - Identifying Different Types of Electrical Power Systems

Ground-to-phase varistor screwsEMC filter screwsFrame
size
Drive
N
L3
L2
L1
Note:
• Because the varistor wire has been disconnected, ABB does not guarantee the EMC
category.
• ABB does not guarantee the functioning of the ground leakage detector built inside the
drive.
• In large systems the residual current device can trip without a real reason.
Identifying different types of electrical power systems
To identify the electrical power system type, find out the supply transformer connection. If
that is not possible, measure these voltages at the distribution board before you connect
power to the drive:
1. input voltage line to line (UL-L)
2. input voltage line 1 to ground (UL1-G)
3. input voltage line 2 to ground (UL2-G)
4. input voltage line 3 to ground (UL3-G).
The line-to-ground voltages in relation to the line-to-line voltage of the electrical power
system types are shown below
Connection diagramElectrical power system typeU
L3-G
U
L2-G
U
L1-G
U
L-L
PE
L2
L3
L1
N
Symmetrically grounded
TN system (TN-S system)
0.58·X0.58·X0.58·XX
PE
L3
L2
L1
Corner-grounded delta system
(nonsymmetrical)
01.0·X1.0·XX
Electrical installation 93
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