Figure 3.31, Operating diagram for timer functions, Lock-out of protection functions – Rockwell Automation 825 Smart Motor Manager User Manual User Manual
Page 85: Applications
Functions 3-52
Publication 825-UM001B-EN-P January 2001
Figure 3.31 Operating Diagram for Timer Functions
Applications
•
Time-graded switching on and off
•
Delaying the transfer of alarm and trip messages
Lock-Out of Protection Functions
With control inputs #1 and #2, one or more protective functions can be locked out as
desired.
•
Asymmetry (phase unbalance)
•
High overload/jam
•
Earth (ground) fault
•
Short-circuit
•
Underload
•
Limiting the number of starts/hour
•
PTC
•
PT100
Applications
Lock-out of protection functions
During certain operational phases when the level differs from the normal values, such as:
•
during starting: earth fault and short-circuit protection
•
at no-load: protection against asymmetry and underload
•
during brief overload phases: high overload/jam
•
during commissioning and fault location (localizing the source of the trouble)
> 0.5 s
t
on
t
off
= 0
t
on
= 0
t
off
t
on
t
off
t
on
t
off
Control input
Output relay
On-delay
Off-delay
On-off-delay
On-off-delay