5. CHANGING SETTINGS
IM 2493AAA-1
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Pressing Set will now move you to the HI Confirm mode. The whole value will
blink. If the value is correct press Set one last time to move on to the LO setting.
Pressing Mode at this time or at any other step in the process will restore the old
HI setting.
Even if you do not want to change the LO setting, you still must go through the
steps in LO to save changes that were made to the HI value. Nothing is stored in
memory until you are in the LO setting Confirm mode and you press Set.
The LO value is changed in the same way as the HI value. First digits, then the
decimal point, then the multiplier, and finally the Confirm mode. In Confirm
mode, with all the digits blinking, a press of the Set button will save all the
changes and move you to the next setting.
Note that the output settings have a precision of four (4) digits only. When the
CT ratio is large, this will result in rounding if you try to set a value too precisely.
For example: If a 5 Amp meter has a CT ratio of 1000:1, then the output settings
must be in units of 100. Trying to set a value to 124 or another value not divisible
by 100 will result in the value being rounded to the nearest 100’s.
The following values apply to the POWER SERIES
Plus
Ammeters:
Model
Default
LO
Minimum
LO
Default
HI
Maximum
HI
Minimum
Span
1 Amps
0.0
0.0
1.0
1.8
0.5
5 Amps
0.0
0.0
5.0
9.0
2.5
The above values are without any scaling by the CT ratio. If the CT ratio is
greater than 1 to 1, than the output setting values above must be multiplied by
the CT ratio. For example, if the CT ratio is changed to 3 to 1, then all the values
in the chart above will be multiplied by 3.
You cannot set a value lower than the minimum LO or higher than the maximum
HI.
The span between the LO and HI must not be smaller than the minimum span.
So with a 5 Amp Ammeter, you could set the LO to 0 and the HI to 2.5. Or you
could set the LO to 1.5 and the HI to 4.0. But you could not set the LO to 1.0 and
the high to 3.0. 3.0 minus 1.0 is less than 2.5.
If a value is too low you will get the error “ErrL”. If the value is too high you will
see the message “ErrH”. If the span is not big enough the message is “ErrS”.
If the input is greater than the HI setting the output will match it until it reaches
the limit of the unit. For a 0-1mA unit that limit is 1.06mA. For a 4-20mA unit that
limit is 20.96mA. Likewise, if you set LO to 1 Amp, for example, and the input
