4–26 PQM POWER QUALITY METER – INSTRUCTION MANUAL
S2 SYSTEM SETUP CHAPTER 4: PROGRAMMING
details about configuring a switch input. If no switch input is assigned as an analog
output multiplexer, the analog output main selection will be the only parameter which
appears at the analog output terminals. The ability to multiplex two different analog
output quantities on one analog output effectively gives the PQM eight analog
outputs. The table below shows the criteria used by the PQM to decide whether the
output is based on MAIN or ALT settings.
• MAIN/ALT 4 mA VALUE: This message appears for each analog output and allows the
user to assign a numeric value which corresponds to the 4 mA end of the 4 to 20 mA
signal range (T20 option) or the 0 mA end of the 0 to 1 mA signal range (T1 option). The
numeric value range will depend upon which parameter is selected. See Table 4–3:
Analog Output Parameters below for details. Note that if the T20 option is installed and
the
ANALOG OUTPUT RANGE setpoint is set to 0-20 mA, this message represents the
0 mA end of the signal range.
• MAIN/ALT 20 mA Value: This message appears for each analog output and allows the
user to assign a numeric value which corresponds to the 20 mA end of the 4 to 20 mA
signal range (T20 option) or the 1 mA end of the 0 to 1 mA signal range (T1 option). The
numeric value range will depend upon which parameter is selected. See Table 4–3:
Analog Output Parameters
below for details.
If the 4 mA (or 0 mA) value is programmed to be higher than the 20 mA (or 1 mA) value,
the analog output will decrease towards 4 mA (or 0 mA) as the value increases and the
analog output will increase towards 20 mA (or 1 mA) as the value decreases. If the 4
mA (or 0 mA) and 20 mA (or 1 mA) values are programmed to an identical value, the
output will always be 4 mA (or 0 mA).
Table 4–2: Analog Output Selection Criteria
CONDITION PRESENT ‘MAIN’
PARAMETER
‘ALT’ PARAMETER OUTPUT
BASED ON
Any condition NOT USED NOT USED MAIN
Control option ‘C’ not
installed
any not available MAIN
Switch assigned to SELECT
ANALOG OUTPUT and is
disabled
any NOT USED MAIN
Switch assigned to SELECT
ANALOG OUTPUT and is
enabled
any NOT USED MAIN
Any condition NOT USED
anything other than
NOT USED
ALT
Switch assigned to SELECT
ANALOG OUTPUT and is
disabled
NOT USED
anything other than
NOT USED
ALT
Switch assigned to SELECT
ANALOG OUTPUT and is
enabled
any
anything other than
NOT USED
ALT
Courtesy of NationalSwitchgear.com
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