5. CHANGING SETTINGS
IM 2493VVV-1
13
Model
Default
LO
Minimum
LO
Default
HI
Maximum
HI
Minimum
Span
150 Volts
0.0
0.0
150.0
162.0
45
300 Volts
0.0
0.0
300.0
324.0
90
The above values are without any scaling by the PT ratio. If the PT ratio is
greater than 1 to 1, than the output setting values above must be multiplied by
the PT ratio. For example, if the PT 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 150V Voltmeter, you could set the LO to 0 and the HI to 45. Or you
could set the LO to 115 and the HI to 160. But you could not set the LO to 50
and the high to 90. 90 minus 50 is less than 45.
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 typically 1.06mA. For a 4-20mA
unit that limit is typically 20.96mA. Likewise, if you set LO to 10 Volts, for
example, and the input dropped below that, the lower end of the output is
typically 3.04mA for a 4-20mA unit. A 0-1mA unit can never go below 0mA.
