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Universal
Measuring Unit
CAM
Manufaturer/Origin: CamilleBauer/Switzerland
Universal measuring unit for heavy current variables
For the comprehensive analysis of any heavy current system.
Customer benefit
• Consistent measurement (without interruption)
• Suited to strongly distorted systems, zero crossing or phase-angle controls
• I/O interface adaptable to individual requirements
• Configuration and measured value acquisition via USB and Modbus interface
• Acquisition of minimum and maximum values with time stamp
• System analysis (harmonics and unbalance)
• Synchronisable real-time clock as a time basis and operating hour counter
• Graphic display with freely arranged measured value display and alarm handling (option)
• Logger for long-term recording of measured value progressions (option)
• Protocol lists for events, alarms and system messages (option)
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Universal measuring unit for heavy current variables
Flexible I/O interface
I/O modules can be assembled according to individual needs. Up to 4 modules with selectable
functionality may be used. Six different hardware modules are available.
Analog outputs ±20 mA or 0/4…20 mA, 2 outputs per module
• On-site display via analog display units
• Heavy-current measurements for PLC
Analog inputs 0/4…20 mA, 2 inputs per module
• Acquisition of ext. quantities, e.g. temperature
• Automatic metering of input quantity
• Scalable, e.g. 4…20 mA to 0…100 °C, displayable on graphic display and requestable via interface
Digital outputs S0, 12/24 VDC, 3 outputs per module (switchable to inputs)
• Alarming output of the logic module
• State reporting
• Pulse output (S0) to external counter
Digital inputs, 3 inputs per module: 12/24 VDC (switchable to outputs)
Digital inputs, 3 inputs per module 48/125 VDC (only in position 4)
• Acquisition of external state information
• Trigger or release signal for logic module
• Pulse input for metering
HV-input, 110/230 VAC, 1 input per module (only in position 4)
• Clock synchronization to system frequency
• Monitoring of voltage availability (ON/OFF)
Ethernet communication (option)
To be able to analyze the huge amount of measured data in real-time, a transmission medium with
high bandwidth is necessary. Ethernet provides this high performance.
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Option 1: Ethernet, Modbus/TCP protocol
Modbus/TCP is a commonly used protocol for an easy access to configuration or measurement
data. It is supported by a large number of visualization software tools and thus allows a fast
implementation of the device. NTP (Network Time Protocol) is supported for time synchronisation via
Ethernet.
Option 2: Ethernet, IEC 61 850 protocol
The communication standard IEC 61 850 is the new standard for substation
automation. Each
possible device or system function is standardized and mapped in so called logical nodes (LN’s).
CAM provides the following logical nodes:
MMXU / MMXN: Instantaneous values of voltages, currents, frequency, powers and load factors as
well as their maximum and minimum values. MMXU is used for asymmetrical 3 and 4 wire systems,
MMXN for single phase and balanced load 3 and 4 wire systems.
MHAI / MHAN: Individual harmonics for voltages and currents, THD (total harmonic distortion) and
TDD (total demand distortion) and their maximum values. MHAI is used for asymmetrical 3 and 4
wire systems, MHAN for single phase and balanced load 3 and 4 wire systems.
MMTR: Active and reactive energy meters for incoming and outgoing power. One instance for both
high and low tariff.
MSTA: Mean values of voltage, current, active, reactive and apparent power as well as their maximum
and minimum values on instantaneous values base. All measured within the same interval.
These values are provided for each phase as well.
MSQI: Imbalance of voltages and currents, calculated in accordance with two different methods.
GGIO: Maps the information of assembled analog and digital input modules. For each input an
instance of GGIO processes state information, a measured quantity or metering pulses from an
external device.
Data logger: Long-term recordings (option)
The data logger allows to perform long-term recordings of measurement progressions or load profiles,
e.g. to monitor the variable load of transformers, feeders or transmission lines. In addition to the
recording of mean-values, fluctuations of instantaneous values may be registered to recognize load
peaks at the earliest possible moment.
By means of the automatical meter reading a time synchronous reading of the meter contents of
all devices may be performed, e.g. on a weekly, monthly or three months base. These values can
be stored for any desired time, thus allow determining the energy consumption per time for billing
purposes.
Lists: Logging of alarms and events (Option)
Lists allow a chronological recording of events, alarms and system messages. Each change of the
system state and each access to the device can thus be reproduced and analyzed at a later time in a
correct sequence. Each entry in the lists is time stamped.
Logic module (standard):
The module consists of up to 32 logic functions with 3 digital input states each. Limit values of
measured variables, states of digital inputs, state defaults via bus interface or results of other logic
functions can be used as input variables. Typical applications are limit value monitoring of individual
variables (e.g. overcurrent of a phase) or of combinations (e.g. phase failure). External functions can
also be monitored via the I/O interface. The results of the logic functions will then trigger actions.
This may be an alarm via digital outputs or relays but also an entry in an alarm or event list or the
indication of an alarm text on the graphic display.
Technical data
Meas. input: Nominal voltage up to 693 V (Ph-Ph), nominal current up to 5 A, overridings
programmable, nominal frequency 45…65 Hz, 10…70 Hz or 10…140 Hz
The device is also available with current inputs for Rogowski coils
System
configuration: Single-phase alternating current, split phase, 3/4-wire three-phase current with
balanced/unbalanced load, clockwise and anti-clockwise rotating systems
Energy meter: Active energy incoming + outgoing, reactive energy incoming + outgoing + inductive
+ capacitive for measured system as well as max. 12 meters for external variables
via digital or analogue inputs. All meters high and low tariff if tariff switching is
activated
Accuracy: Voltage and current 0.1%, power and voltage unbalance 0.2%
Harmonics, THD and TDD 0.5%, power factor ±0.1°, frequency ±0.01 Hz
Active energy Class 1 (EN 62 053-21), reactive energy Class 2 (EN 62 053-23)
Analogue inputs/outputs ±0.1%
Dimensions: 90 x 186 x 63 mm, assembly on top-hat rail (35 x 15 mm or 35 x 7.5 mm)
Standard interfaces (for configuration, service, measured value polling)
• Modbus/RTU connection, max. 32 participants (incl. master), baud raten up to 115.2 kBd
• USB connection (USB mini-B, 5-pole), protocol USB 2.0
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