socomec Continental Control Systems MCM MB Series, Installation Manual

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MCM-Inst-1.10 Page 23 of 27
4 Operation
4.1 Initial Configuration
Generally, the network integrator will remotely configure the MCM and the variables.
The MCM does not include a display or buttons, so it is not possible to configure or monitor it directly,
other than some Modbus settings and the basic LED diagnostics described below.
If you have not configured the MeterConfig registers, then the LED indications may be incor-
rect or misleading.
Be sure to configure the MCM before using the LEDs for diagnostics.
At a minimum, you must assign the CtAmps with the rated current (amps) of the attached current
transformers for correct measurements. In many cases, with the MCM, it will be necessary to program
the
MeterConfig registers. If any CTs are installed backward, you can use the CtDirections register
to correct the polarity. If you are using a potential transformer, then you will also need to configure
the
PtRatio register with the correct ratio. See the website article Using Potential Transformers for
details.
4.2 Power Status LEDs
The three status LEDs for each submeter block (SMB) can help indicate correct measurements and
operation. The “
CT1 ”, “ CT2 ”, and “ CT3 ” on the diagrams correspond to the three meter elements of
each SMB (see 1.2 Terminology ).
4.2.1 Normal Start-Up
Each SMB displays the following start-up sequence whenever
power is first applied.
4.2.2 Positive Power
Any element with the LEDs flashing green indicates positive active
power.
4.2.3 No Power
Any element with a solid green LED indicates no power, but the
line voltage is present.
4.2.4 No Voltage
Off LEDs indicate no voltage on that element.
4.2.5 Negative Power
Red flashing indicates negative power for that element. Reversed
CTs, swapped CT wires, or CTs not matched with line voltage
phases can cause this.
4.2.6 Overvoltage Warning
The following indicates that the line voltage is too high for
this model.
Disconnect power immediately! Check the line
voltages and the meter ratings (in the white box on the label).
4.2.7 No Line Voltage
If the measured line voltages for all the elements
of an SMB is less than 24 Vac, then the SMB will
briefly flash all three status LEDs together every
three seconds.
1.0sec 1.0sec 1.0sec
Green Yellow Red
Green Yellow Red
Green Yellow Red
CT3
CT2
CT1
Green Off Green Off Green Off
Green
Off
Red Off Red Off Red Off
C
1.0sec
G R G R G R G R G R G R
G R G R G R G R G R G R
G R G R G R G R G R G R
CT3
CT2
CT1
3.0sec
Off
Off
Off
R
R
R
Off
Off
Off
R
R
R
P
CT3
P
CT2
P
CT1