Resistance grounded secondary systemTT system (separate ground rods)
xx1700001313
xx1700001312
Not allowed power supply systems
The following systems are not allowed by ABB:
IT system (ungrounded secondary)Un-symmetric system
The voltage between phases and ground is
undefined and may cause damage to both
drive system and mains line filter (if installed).
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.
xx1700001317
xx1700001316
xx1700001315
xx1700001314
Isolation transformer
A three-phase isolation transformer between the mains supply and the control
cabinet is required for any of the below conditions:
• Not allowed power supply system used, as mentioned in Not allowed power
supply systems on page 69.
• 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, see below.
• Mains power supply is out of standard limits, like voltage variations (+10%
to -15%), frequency variations (48.5 Hz to 61.8 Hz), harmonic (5%), voltage
unbalance (2%), voltage surge, voltage dips/swells, and so on.
Continues on next page
Product manual - IRC5 Compact 69
3HAC047138-001 Revision: G
© Copyright 2009-2017 ABB. All rights reserved.
2 Installation and commissioning
2.6.3 Power supply system requirements
Continued
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