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TD 17558
Effective 3/98
4.3 CONTRAST
The contrast of the screen can be adjusted without entering the
Contrast Adjust
menu by holding in the
Enter
button while pressing the S
croll
up arrow button (to
decrease contrast) or the
Scroll
down arrow button (to increase contrast).
4.4 DISPLAYED SIGN CONVENTIONS
The IQ 200 not only displays system values, but also indicates whether factors are
lagging or leading by displaying the following symbols:
Display
Indication
Lg
lagging (inductive)
Ld
leading (capacitive)
L
g
lagging net var hours
L
d
leading net var hours
The IQ 200 is shipped with lagging vars and power factor represented by negative
values at the load, conforming to the
mathematical sign convention
. To change to
the
power engineer convention
, which assumes positive values at the load, the
IQ 200 must be connected to an IMPACC™ network and programmed accordingly.
Note that the choice of
mathematical
or
power engineer
convention
has no effect on
the unsigned leading and lagging energy displays, but will reverse the sign of net
energy displays.
The following relationships apply:
Convention
Load
var Values
Power Factor Values
Mathematic
inductive
negative
negative (lagging PF)
Mathematic
capacitive
positive
positive (leading PF)
Power Engineer
inductive
positive
positive (lagging PF)
Power Engineer
capacitive
negative
negative (leading PF)
Содержание IQ 200
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