3300 ACM Installation and Operation Manual Power Measurement Ltd.
1-2 Introduction
Quick and easy installation
The separate display and base modules of the 3300 ACM
simplify wiring connections and reduce installation time.
The compact, rugged base module provides a large, utility
approved, barrier-style terminal strip for reliable connec-
tions. No transducers are required. Connections from
CTs can be made directly (via shorting blocks). No PTs
are required for 4-wire Wye or Single Phase systems
under 347 VAC line-to-neutral or 600 VAC line-to-line.
PTs are required on all Delta systems.
The separate display module is panel mountable, requir-
ing only a single cutout. The module has been designed to
fit ANSI C39.1 cutouts, simplifying replacement of exist-
ing analog meters. The display module connects via a
single pluggable cable to the base module, allowing the
base module to be mounted inside the switchgear cabinet.
No switches or additional wiring are required on the
panel door.
Field programmability
Volts and Amps Scales, Volts Mode (wye, delta, single
phase), and Baud Rate are all easily programmable from
the front panel. A portable or remotely located computer
can also be used to program setup data via the communi-
cations port. All setup data is saved when 3300 ACM
power is turned off. All programming is password
protected.
Communications and SCADA compatibility
The 3300 ACM is equipped with an optically isolated RS-
485 communications port for remote display of measured
data. This allows the 3300 ACM to be incorporated as one
element within sophisticated SCADA or Energy Manage-
ment Systems.
RS-485 can operate as a 2-wire LAN with up to 32 devices
per loop, and is capable of addressable polling of multiple
units, packet transmission, and high throughput (300 to
19,200 baud).
The 3300 ACM maintains communication compatibility
with Power Measurement’s other 3000 series devices and
low cost PC-based power monitoring systems: M-SCADA,
L-SCADA, and PowerView. These systems can be used to
display the real-time measured data from each 3300 ACM,
or for the entire power distribution system.
The basic model 3300 ACM also provides Modicon
Modbus compatiblity. Basic Power Measurement commu-
nications uses an open protocol that can provide access by
other third-party systems. A comprehensive description
of the 3300 ACM communications protocol can be found in
Appendix G.
New feature upgrades made easy
The 3300 ACM has been designed to maintain its position
at the forefront of current technology through upward
compatibility. An advanced system architecture was
developed by Power Measurement to support simple
upgrading of the 3300 ACM on-board operating firmware.
New features or performance enhancements can be
installed easily via the device's communications port -
without any interruption to electrical service.
Each 3300 ACM should be connected to a local RS-485
communications bus during initial installation to allow
firmware upgrades to be accomplished without the need
for wiring disconnections or removal of units from their
mountings. This is described in detail in Chapter 2.
kWh pulsing feature
The 3300 ACM offers an additional feature which allows
the RS-485 port to be used as a kWh pulse output, suitable
for driving an external relay. This is also described in
detail in Chapter 2.
1.2 SYSTEM APPLICATIONS
The 3300 ACM is a state-of-the-art alternative to tradi-
tional analog electro-mechanical metering devices. Be-
cause of its unique measurement, display, and communi-
cations capabilities the 3300 ACM should be considered
for use in:
a) Utility installations and substation metering.
b) Co-generation systems.
c) Office and commercial buildings, including large
stores, shopping centres, and hotels.
d) Hospitals.
e) Telephone exchanges.
f) Factories and other industrial sites, including pulp
and saw mills, chemical processing plants, breweries,
and other processing or manufacturing facilities.
g) Multi-user sites where allocation of electrical costs is
desirable.
h) Any other installation which uses significant amounts
of electrical energy or where remote monitoring is
needed.
Courtesy of NationalSwitchgear.com
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