Rockwell Automation RELIANCE ELECTRIC SP500 - 3.4 Installing an Emergency Stop; 3.5 Motor Considerations

3.4
3.4.1
3.5
3.5.1
Installing an Emergency Stop
ATTENTION: The user must provide an external, hardwired emergency
stop circuit outside of the drive circuitry. This circuit must disable the
system in case of improper operation. Uncontrolled machine operation
may result if this procedure is not followed.
Depending upon the requirements of the application, the SP500 drive can be
programmed to provide either a coast-to-rest (default) or a ramp-to-rest (user-option)
operational stop without physical separation of the power source from the motor. Refer
to sections 5.2 and 8.3 (parameter F-16) for more information on how to program an
operational stop.
In addition to the operational stop, users must provide a hardwired emergency stop
external to the drive. The emergency stop circuit must contain only hardwired
electromechanical components. Operation of the emergency stop must not depend on
electronic logic (hardware or software) or on the communication of commands over an
electronic network or link.
Complying with Machinery Safety Standard EN 60204-1:1992
This section applies to users who must comply with machinery safety standard
EN 60204-1:1992, part 9.2.5.4, Emergency Stop.
The SP500 drive coast-to-rest stop is a category 0 operational stop. The ramp-to-rest
stop is a category 1 operational stop.
The required external hardwired emergency stop must be either a category 0 or 1
stop, depending on the user’s risk assessment of the associated machinery. In order
to fully comply with machinery safety standard EN 60204-1:1992, part 9.2.5.4, at least
one of the two stop methods must be a category 0 stop. Refer to Appendix D for more
information.
Motor Considerations
To obtain motor nameplate horsepower, the crive’s output current rating at the
selected carrier frequency should be equal to or greater than motor nameplate
current. If the motor nameplate current rating is higher than the drive’s output current
rating, derate motor horsepower by the ratio of the drive’s output ampere rating (at the
selected carrier frequency) to the motor nameplate current. Note that this
approximation is only accurate if the drive and the motor have nearly the same rating.
Single-Motor Applications
Size the drive and motor for the load and speed requirements of the specific
application.
The motor’s operating current must not exceed the drive’s rated output current (at the
selected carrier frequency). In addition, the motor’s horsepower rating (for example, 1,
2,3, 5, 7, 10, 15, and 20 HP) must not be more than one horsepower range larger
than the drive’s horsepower rating.
SP500 System Planning
3-9