Measurements - DEMA CPM 310 G User Manual

1. Phase and earth current RMS momentary values are monitored in this region. Values are given in amperes.
2. Thermal Θ (heating percentage) values are monitored in this region. The thermal heating percentage
shown here is the cumulative evaluation made by using the set parameters and RMS current
measurements. Thermal Θ can be reset by clicking the Reset button; but it must be kept in mind that
resetting the Thermal Θ under normal service conditions may result in protection errors.
3. LED Status window monitors both the positions of the fixed physical LEDs, placed at the front face of CPM
310 G; and the programmable virtual LEDs, which can be accessed by pressing the Reset button once while
at any menu. The window enables users to see the explanations of the LEDs hereby being monitored and
the position of these LEDs via color graphics. The LED Conditions window on the sample picture above
represents that the relay is being supplied by the auxiliary source healthily; while there are no tripping,
alarming or failure detections.
4. Input Status window displays the actual assignments made to the 7 programmable inputs, and the activity
on the inputs at that time. If any of the inputs are activated, the activation is announced to the user via red
color on the virtual LEDs of the related inputs. Similarly, if no inputs are active, there will be no active LEDs
of inputs monitored. The Input Status window on the sample picture above states that; CB Position
function is assigned to the first input, 52a and 52b functions are assigned to the second and third inputs
respectively, and the other inputs are left passive. The window also tells that none of the inputs (1-7) are
active.
5. Output Status window displays the actual assignments made to the 6 programmable outputs plus trip and
watchdog outputs and the activity of those at that time. The activity display method of outputs are similar
to input status'; the active output is indicated by a red color virtual LED. The Output Status window on the
sample picture above states that; the programmable outputs (1-6) and trip relay (T) are inactive, and the
watchdog relay (W) is closed – as expected when there are no internal errors or auxiliary supply shortages.
LED, input and output conditions windows appear on any submenus of Measurements tab; thus, the
explanations hereby given will not be repeated on the other pages. □
Measurements » Analog Values » RMS Current
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