4 | UL-compliant use STOBER
16
03/2020 | ID 442793.03
4 UL-compliant use
This chapter contains relevant information for use under UL conditions (UL – Underwriters Laboratories).
Surrounding air temperature and pollution degree
The maximum surrounding air temperature for UL-compliant operation is 45°C. Use in an environment with pollution
degree 2 is permitted.
Network layout
All device types supplied with 480V
AC
are intended solely for operation with grounded wye sources at 480/277V
AC
.
Line fuse
For UL-compliant line fuses of drive controllers connected to the grid, observe the specifications in the chapter UL-
compliant line fuses [}46].
Branch circuit protection
Integral solid state short circuit protection does not provide branch circuit protection (line fuse) upstream of the drive
controller. Branch circuit protection must be provided in accordance with the manufacturer instructions, the National
Electrical Code, the Canadian Electrical Code, part I, and any additional local codes.
Protective grounding
The protective grounding of motors connected to the drive controller must not be connected using terminals X20A and
X20B. The grounding conductor connection of the motor must be ensured for the respective application in accordance with
the valid electrical standards.
The grounding at terminal X10 of the SC6 drive controller must not be used for protective grounding. The housing for the
drive controllers must be connected to the protective grounding using the M6 ground bolt (4.0 Nm, 35Lb.inch).
Original text:
WARNINGS!
Safety grounding
The external motors which are connected to the drive units SC6A shall not be grounded over the drive units. The bonding/
grounding of the motor(s) shall occur in the end use application in accordance with the requirements of applicable electrical
codes/standards.
The grounding provisions present on the terminals X20A/X20B of the SI6 unit are not intended for safety grounding of the
motors.
The grounding provision present on terminal X10 of the inverter unit is not to be used for the grounding of the drive
system. The chassis of each SC6A drive unit is to be bonded through the M6 grounding stud present on each SC6A unit.
The connection for the protective grounding on the housing is identified by the grounding symbol in accordance with
IEC 60417 (symbol 5019).
Observe the notes in the chapter UL-compliant connection of the grounding conductor [}49] for correct installation.
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