Rockwell-automation 810 5.0: Inverse Time Current Relays User Manual download pdf (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 DASHPOTO SERIES A RELAY OR SERIES A DASHPOT 0

ARACTERISTIC AT

+4R"C

000 ’

I I I

8001

I I I I

I I

0.1 '

I I I

0 100

Percen

of Minimum Operating Current

200 300 400 500

600

0.1 ;

I I I I

100 200 300 400 500 600

Percent of Minimum Operating Current

With Series B FluidWith Series B Fluid

10000

TlME-CURRENTCHARACTERlSTICSAT+4O"C

4000

Red Fluid

b-ii

0.2

,>I

0.1 '

I I

0 100 200 300 400 500 600

Percent of Minimum Operating Current

With Series A Fluid

100 200 300 400 500 600

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 Dashpots do not have this rib.

1 2 3 4 5

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Rockwell-automation 810 5.0: Inverse Time Current Relays User Manual Page 2

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