3300 ACM Installation and Operation Manual Power Measurement Ltd.
Installation 2-7
MODEL: 3300 ACM
SERIAL NUMBER:
OPTIONS:
ELECTRICAL RATINGS
POWER
MEASUREMENT
LTD.
6703 RAJPUR PLACE
VICTORIA, B.C.
CANADA V8X 3X1
MADE IN
CANADA
+
-
I32
I31
I22
I21
I12
I11
V3
V2
V1
L
N
G
NOTES: 1. VOLTS MODE = 3 WIRE WYE 2. Note the polarity of each CT and PT.
ABC N
FUSES PT's FUSES
SWITCHGEAR CHASSIS
GROUND
CT SHORTING SWITCH
OR TEST BLOCK
LINE
CTs
EXPORT/REVERSE/NEGATIVE
IMPORT/FORWARD/POSITIVE
LOAD
2A
Base Module
2A
SWITCHGEAR CHASSIS
GROUND
SWITCHGEAR
CHASSIS GROUND
SUPPLY POWER
(dependent on equipped
power supply option - see
Section 2.3)
{
250 mA SLO BLO
! IMPORTANT !
It is important that all 3300 ACM
installations include communica-
tions wiring. Refer to Section 2.6
for more information.
The 3300 ACM also supports a 2½-element connection
scheme which requires only two PTs. In this mode, the
phase B voltage reading is derived from the other available
voltages.
This configuration is shown in Figure 2.5.4c. VOLTS MODE
should be set to 3 WIRE WYE.
WARNING
VOLTS MODE = 3 WIRE WYE will only
provide accurate power measurement if
the voltages are balanced. If the phase B
voltage is not equal to the phase A and C
voltages, the power readings may not
meet the 3300 ACM accuracy specifica-
tions.
Figure 2.5.4c 4 Wire WYE: 2½ Element Connection Using 2 PTs
Courtesy of NationalSwitchgear.com
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