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Chapter 6—Alarms 63230-300-212
Scaling Alarm Setpoints April 2001
© 2001 Schneider Electric All Rights Reserved
92
This section is for users who do not have SMS and must set up alarms from
the circuit monitor display. It explains how to scale alarm setpoints.
When the circuit monitor is equipped with a display, the display area is 4 x 20
characters, which limits the displaying of most metered quantities to five
characters (plus a positive or negative sign). The display will also show the
engineering units applied to that quantity
.
To determine the proper scaling of an alarm setpoint, view the register
number for the associated scale group. The scale factor is the number in the
Dec column for that register. For example, the register number for Scale D to
Phase Volts is 3212. If the number in the Dec column is 1, the scale factor is
10 (10
1
=10). Remember that scale factor 1 in Table 6–1 on page 91 for Scale
Group D is measured in kV. Therefore, to define an alarm setpoint of 125 kV,
enter 12.5 because 12.5 multiplied by 10 is 125. Below is a table listing the
scale groups and their register numbers.
Scale Group D—Voltage, L–L Voltage
0–3,276.7 V –1
0–32,767 V 0 (default)
0–327.67 kV 1
0–3,276.7 kV 2
Scale Group E—
Neutral Voltage, L–N, N–G Voltage
0–3,276.7 V –1 (default)
0–32,767 V 0
0–327.67 kV 1
0–3,276.7 kV 2
Scale Group F—Power kW, kVAR, kVA Power
0–32.767 kW, kVAR, kVA –3
0–327.67 kW, kVAR, kVA –2
0–3,276.7 kW, kVAR, kVA –1
0–32,767 kW, kVAR, kVA 0 (default)
0–327.67 MW, MVAR, MVA 1
0–3,276.7 MW, MVAR, MVA 2
0–32,767 MW, MVAR, MVA 3
Table 6–2: Scale Group Register Numbers
Scale Group Register Number
Scale Group A—Phase Current 3209
Scale Group B—Neutral Current 3210
Scale Group C—Ground Current 3211
Scale Group D—Voltage, L–L3212
Scale Group E—
Neutral Voltage, L–N, N–G
3213
Scale Group F—Power kW, kVAR, kVA 3214
Table 6–1: Scale Groups
Scale Group Measurement Range
Scale
Factor
SCALING ALARM SETPOINTS