ABB IRC5 Compact Product Manual page 68

2 Installation and commissioning
2.6.3 Power supply system requirements
Continued
TT system (separate ground rods)
xx1700001312
Not allowed power supply systems
The following systems are not allowed by ABB:
Un-symmetric system
These transformers provide un-symmetric
phase voltages with respect to ground. Inher-
ent phase imbalances with respect to ground
would put the drive system and mains line
filter (if installed) under unacceptable stress.
xx1700001314
Isolation transformer
A three-phase isolation transformer between the mains supply and the control
cabinet is required for any of the below conditions:
Continues on next page
68
xx1700001315
• Not allowed power supply system used, as mentioned in
supply systems on page
• When the mains supply is shared with a pressing machine, frequency
converter, or other large industry equipment that may cause the power supply
characteristics out of standard limits. To some extent, isolation transformers
will filter out harmonics, spikes and surges.
© Copyright 2009-2020 ABB. All rights reserved.
Resistance grounded secondary system
L1
L2
L3
N
xx1700001313
IT system (ungrounded secondary)
The voltage between phases and ground is
undefined and may cause damage to both
drive system and mains line filter (if installed).
xx1700001316
68.
Product manual - IRC5 Compact
L1
L2
L3
N
L1
L2
L3
xx1700001317
Not allowed power
3HAC047138-001 Revision: M