Rockwell Automation 810 5.0: Inverse Time Current Relays - Manual (Page 2)

OPERATING CURRENT ADJUSTMENT - stamped on the nameplate. After the
(Not necessary if factory set to user’s core and dashpot assembly is removed,
specified value). The minimum operat- the core is turned up or down on the
ing current (100% on the time-current piston’s threaded stem till the line cor-
characteristics graph) is adjusted by responding to the desired operating cur-
changing the vertical position of the core rent is in line with the top edge of the
within the operating coil. Calibration dashpot Currents other than those indi-
lines on the core correspond to current cated by the lines are possible by
values in the table on Page 3 and interpolation.
NOTE: If electrical tests are made of cur-
rent calibrations they should be done
without fluid in the dashpot (clean
and dry.)
SERIES B RELAY OR SERIES B SERIES A RELAY OR SERIES A DASHPOT
ARACTERISTIC AT
000
I I I
800 1 i
I I
I
0.1
I I I I
0 100
Percent of Minimum Operating Current
200 300 400 500 600
0.1
I I I I
100 2 0 0 3 0 0 400 5 0 0 6 0 0
Percent of Minimum Operating Current
With Series B Fluid With Series B Fluid
10000
4000
Red Fluid
i
\ .
0.2
0.1
I I I I I
0 100 200 300 400 500 600
Percent of Minimum Operating Current
With Series A Fluid I With Series A Fluid
100 2 0 0 3 0 0 4 0 0 5 0 0 6 0 0
Percent of Minimum Operating Current
Series B Dashpots are identified by the rib along the side of the dashpot. Refer to photo on back page. Series A do not have this rib.