Rockwell Automation 7703E Medium Voltage SMC OEM Components - 10-15 kV - Manual (Page 20)

20 Rockwell Automation Publication 7703E-IN001E-EN-P - July 2014
Chapter 3 PowerBrick™ Installation
Grounding
PowerBrick Operating
Restrictions The SCRs in the power stacks are not intended for continuous operation.
Observe the following operating restrictions for the SMC when operating at the
thermal capacity limit and maximum ambient (40 °C). (Refer to
Table 3 .)
• Power stacks must be bypassed using a separate contactor or circuit breaker
when the motor is up to speed.
• Do not operate the power stacks for more than 60 seconds in one hour.
• Do not exceed 30 seconds for any individual duty cycle of the power
stacks.
• Do not operate the power stacks for at least five minutes between a start or
a stop cycle.
• For repeated hourly operation, forced ventilation is required.
Note: It may be possible to exceed some of the above restrictions if all maximum
ratings are not attained. For example, higher ambient conditions can be
supported when the % FLC and/or start time are reduced. Please consult factory
for details.
ATTENTION: It is the responsibility of the OEM to ensure that the final enclosure
is suitably bonded to ground, and that provisions for grounding are made
according to local electrical codes and standards.
ATTENTION: The operating restrictions for the SMC must be adhered to. Failure
to observe the recommended precautions may result in injury to personnel or
damage to the equipment.