ABB ACS880-07CLC, Hardware Manual

Page: 17 / 214

6. Measure that the installation is de-energized. If the measurement requires removal or
disassembly of shrouding or other cabinet structures, obey the local laws and regulations
applicable to live working (including – but not limited to – electric shock and arc
protection).
• Use a multimeter with an impedance of at least 1 Mohm.
WARNING!
The busbars inside the cabinet are partially coated. Measurements made
through the coating are potentially unreliable, so only measure at uncoated
portions. Note that the coating does not constitute a safe or touch-proof
insulation.
• Make sure that the voltage between the drive input power terminals and the
grounding (PE) busbar is close to 0 V.
• Open the door(s) of the supply module cubicle(s).
• Locate the measurement points (XACx) in front of each array of input terminals.
Each input terminal is connected to a specific pin of the measurement point.
For example, a drive with six supply modules has two supply module cubicles,
and three measurement points (XAC1, XAC2, XAC3). The picture below shows
a cubicle with two modules.
Measurement point
Input terminals
AC fuses
• Measure the voltage of each individual pin of each measurement point against
PE.
• If the voltage of all pins of all measurement points is close to 0 V, remove the
plastic shroud(s) from in front of the input terminals.
• Working from outside to inside, measure the voltage between each input terminal
and PE.
WARNING!
Do not touch the AC fuses or the busbars they are connected to.
• Make sure that the voltage between the drive DC busbars (+ and -) and the
grounding (PE) busbar is close to 0 V.
Safety instructions 17