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CPM4 –

Control and Protection Module

A single module for 3-phase measurements and electrical panels protection.

The CPM device has been designed to protect the electrical panels and electrical plants, mainly the power factor regulation and filtering plants, by mean of continuous monitoring of line voltage, line current (amplitude and harmonics) and temperature. The voltage value is compared with a threshold value programmable, giving an alarm when exceeded. Current value is processed to calculate the RMS amplitude and the total harmonic distortion THD: when a maximum short-circuit and current distortion threshold is exceeded an alarm output is generated. Temperature value, transduced by means of an internal probe, is monitored to activate cooling devices (fan, etc...) when a programmable pre-alarm threshold is exceeded and to produce an alarm if a programmable maximum value is exceeded. All measurements and alarms are displayed on the front panel display. Working parameters setup is accomplished using 4 functional keys. Small size (DIN 96x96 mm) and low cost make CPM ideal to use in all industrial and civil electrical plants.

Front Panel Display and Keys

MEASUREMENTS LED V, I, THD%, Iharm, Hz,
Indicate the measure currently showed on 3-digit display: voltage, current, harmonic distortion, temperature, harmonic current and net frequency. °°°° T L1, L2, L3
Indicate the phase of the measure currently showed on 3-digit display. In Voltage Measurements, the concurrent lighting of two leds indicates the channels wich the phase-phase voltage is referred to (for ex. L1-L2 indicates V 12 voltage). x 1000
Multiplier x 1000 of the measure currently displayed. STATUS LED FAN
Indicates that the pre-alarm temperature threshold has been exceeded and the cooling devices are activated. MANUAL RESET
On: the manual reset of alarms is selected. Off: the automatic reset alarm (when the alarm condition disappears) is selected (except over-temperature alarm, always manual resettable) ALARM
Blinks togheter with the alarmed measure to indicate that an alarm condition has occurred. KEYS RESET/PHASE
If pressed for 5 seconds in measure session, makes a reset of alarms and max/min values; if pressed during the setup session, forces the default value of the currently edited parameter. If pressed at the power-on, forces the default programming. /MAX
In measure session visualizes the maximum value reached by the correspondent measure. During setup session increases the parameter value. /MIN
In measure session visualizes the minimum value reached by the correspondent measure. During setup session decreases the parameter value. SCROLL
Selects the measure to be showed on 3-digit display. During setup session, selects the parameter to be programmed.