Rockwell Automation 20B PowerFlex 70, PowerFlex 700 Reference Manual - Manual (Page 15)

Alarms
Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013 15
Alarms
Alarms are indications of situations that are occurring within the drive or
application that should be annunciated to the user. These situations may affect
the drive operation or application performance. Conditions such as Power Loss
or Analog input signal loss can be detected and displayed to the user for drive or
operator action.
There are two types of alarms:
•
Type 1 Alarms are conditions that occur in the drive or application that may
require alerting the operator. These conditions, by themselves, do not cause
the drive to “trip” or shut down, but they may be an indication that, if the
condition persists, it may lead to a drive fault.
•
Type 2 Alarms are conditions that are caused by improper programming and
they prevent the user from Starting the drive until the improper programming
is corrected. An example would be programming one digital input for a 2-wire
type control (Run Forward) and another digital input for a 3-wire type
control (Start). These are mutually exclusive operations, since the drive could
not determine how to properly issue a “Run” command. Because the
programming conflicts, the drive will issue a type 2 alarm and prevent Starting
until the conflict is resolved.
Alarm Status Indication
[Drive Alarm 1]
[Drive Alarm 2]
Two 16 bit Drive Alarm parameters are available to indicate the status of any
alarm conditions. Both Type 1 and Type 2 alarms are indicated.
A “1” in the bit indicates the presence of the alarm and a “0” indicates no alarm is
present
Configuration
In order for a drive alarm to be annunciated to the “outside” world, it must first
be “configured” or activated. Configuration parameters contain a configuration
bit for each Type 1 alarm. Type 2 alarms are permanently configured to
annunciate. The configuration word is a mirror image of the Drive Alarm word;
that is, the same bits in both the Drive Alarm Word and the Alarm Configuration
Word represent the same alarm.
Drive Alarm
1 1 1
Alarm Config
1 0 0
X X
Active
Alarm Inactive
Alarm
Inactive
Alarm