Multi-Tech Systems 7500 - Manual (Page 39)

ION 7500 / ION 7600 User’s Guide PQ (Power Quality) Setup
Chapter 2 - Using The Front Panel Page 39
PQ (Power Quality) Setup
The PQ Setup screen contains the following settings for the detection voltage sags
and swells (i.e. ITI (CBEMA) Type 2 and Type 3 disturbances). The ION module
setup register corresponding to each Sag/Swell Setup value is included for
advanced users. Refer to the online ION Programmer’s Reference for complete
details about the Sag/Swell module.
Sag Limit
This item specifies the magnitude below which a power system input must fall for
a sag to be recorded. This value must be expressed as a percentage of the nominal
voltage (entered below in the
NOMINAL VOLTAGE item). Setting the SAG LIMIT value
changes the Sag Lim setup register in the factory-configured Sag/Swell module.
Swell Limit
This item specifies the magnitude above which a power system input must rise for
a swell to be recorded. This value must be expressed as a percentage of the nominal
voltage (entered below in the
NOMINAL VOLTAGE item). Setting the SWELL LIMIT
value changes the Swell Lim setup register in the factory-configured
Sag/Swell module.
Change Criteria
You do not need to change this value for normal operation. This setting specifies
the amount by which an input must change (either rise or fall) during a
disturbance to be considered a new sub-disturbance. This value must be expressed
as a percentage of the nominal voltage (entered below in the
NOMINAL VOLTAGE
item).
For example, if your Nominal Voltage is 120 V and your Change Criteria is 10%,
any voltage change of 12 V or more during a disturbance will cause a new
sub-disturbance to be recorded. Setting the
CHANGE CRITERIA value changes the
ChangeCrit setup register in the factory-configured Sag/Swell module.
Nominal Voltage
This item specifies the nominal voltage of the power system you are monitoring.
By default, this value is set to 0 V. You should ensure that this item matches your
power system’s nominal voltage (i.e. 120, 277, or 347). All Sag/Swell functions are
disabled when the nominal voltage setting is 0 (zero). Setting the
NOMINAL
VOLTAGE value changes the Nom Volts setup register in the factory-configured Sag/
Swell module.
C AUTION
For the ION 7600 only, the value you enter will also be used by the Transient module and in all EN50160
compliance calculations. Therefore, all EN50160 and Transient functions are disabled when the
NOMINAL
VOLTAGE setting is 0 (zero). You should ensure that this item matches your power system’s nominal voltage
(i.e. 120, 277, or 347).