Chapter 3 - Acs 502 Installation Instructions; Grounding And Ground Faults; Pre-Installation Planning; Environment - ABB ACS 502 Series Installation & Start-Up Manual

Chapter 3 – ACS 502 Installation Instructions
Grounding and
Ground Faults
Pre-Installation
Planning

Environment

ACS 502 Installation & Start-up Manual
This chapter explains how to install the ACS 502 and connect all power,
motor, and control wiring. It also describes the initial inspection procedures.
The ACS 502 must always be grounded through a ground conductor
connected to the ground terminal.
If the ACS 502 is connected to a system without system ground, the ground
fault protection must be capable of starting at ground fault currents containing
high frequency and DC components. The ACS 502 ground fault protection
guards the variable frequency drive against ground faults occurring in the
motor or the motor wiring.
Fault current protective switches do not necessarily operate properly with
variable frequency drives. When using such switches their function should be
checked at possible ground fault currents arising in a fault situation.
This drive has been tested in accordance with UL508.
480 VAC units: The drives are suitable for use on a circuit capable of
delivering not more than 42,000 rms Amperes, 500 Volts maximum.
When circuit breakers are supplied, the drive package is limited to the rating
of the circuit breaker, which is 18,000 rms Amperes for the 50 & 60 HP units;
25,000 for the 75 - 125 HP units; and 30,000 for the 150 - 400 HP units.
600 VAC units: are suitable for use on a circuit capable of delivering not
more than 42,000 rms Amperes, 600 Volts. When circuit breakers are
supplied, the drive package is limited to the rating of the circuit breaker,
which is 14,000 rms Amperes.
When output chokes are supplied, 480 and 600 VAC units are suitable for use
on a circuit capable of delivering not more than 65,000 rms Amperes, 500
Volts or 600 Volts.
These drives are to be used in a heated, indoor controlled environment that is
relatively free of moisture and conductive contaminates such as condensation,
carbon dust, and the like.
The maximum ambient temperature allowed is 113°F (45°C) for an ACS 502
in a NEMA 1 enclosure for constant torque loads, when the load current is
lower than or equal to the continuous rated constant torque current (I
maximum ambient temperature allowed is 104°F (40°C) for an ACS 502 in a
NEMA 12 enclosure for constant torque loads; and an ACS 502 in a NEMA 1
enclosure for variable torque loads, when the load current is lower than or
equal to the continuous maximum load current (I
The cooling air must be clean and free from corrosive materials. When
necessary the required cooling should be provided by using clean, dry air. If
the cooling air contains dust, clean the cooling surfaces of the unit regularly
using compressed air and a brush.
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