SIRIUS 3RR2 current monitoring relays
8.8 Operation
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
707
8.8.1.4 ON-delay time
Definition of ON-delay time (onDel)
This is where the delay time until the start of monitoring following the start of current flow is
set.
Explanation
The set ON-delay time starts when current flow commences (I > 0) or the voltage U
s
is
connected. The relay picks up and the red FAULT LED flashes. During this time,
undershooting or overshooting of the set threshold values will not cause the CO contact to
respond. Once this time has elapsed, the switching contact changes the switching state and
the FAULT LED lights up continuously if the current value is outside the correct range. This
provides a means of protecting a motor with heavy-duty starting/lengthy startup, for example.
Note
Special cases wire break/phase failure
A delay time is not observed if a wire break or phase failure is detected. The current
monitoring relay responds immediately (≤ 300 ms) in such cases.
Setting range
The setting range for the ON-delay is continuously 0 s to 60 s.
Factory setting
The ON-delay is factory-set to 0 s.
Changes to settings
Changes to the ON-delay can be made by adjusting the corresponding rotary button (onDel)
with a screwdriver.
To Next Page
Loading...
