DEMA CPM 311, User Manual

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Technical Characteristics
Delaying Sel.1 Used for increasing trip delays for the selected protection functions while the
protection group is set to "1".
Start Wave Record Used for triggering a 3 second record of the current waveform.
Cold Load Pickup Used for increasing the threshold settings of the selected protection function for a
given time.
Spring Failure Supervises the CB charging spring via auxiliary contacts.
Change Set.Group Used for altering between protection settings groups 1 and 2.
Block ARCL Used for disabling auto-reclose cycles.
Reset %Θ Used for resetting the thermal image.
Trip Circuit Sup. Supervises the trip circuit of circuit breaker.
Reset RL1-RL6 Resets all programmable outputs.
Reset LED Used for resetting programmable LEDs and alarm records.
Pressure Trip Evaluates the pressure trip auxiliary contact information.
Buchholz Alarm Evaluates the Buchholz alarm auxiliary contact information.
Buchholz Trip Evaluates the Buchholz trip auxiliary contact information.
Temp.Alarm Evaluates the thermometer alarm auxiliary contact information.
Temp.Trip Evaluates the thermometer trip auxiliary contact information.
Blocking Sel.2 Used for blocking selected protection functions while the protection group is set to
"2".
Delaying Sel.2 Used for increasing trip delays for the selected protection functions while the
protection group is set to "2".
Connection Cable 2-wire screened communications cable.
Connection Point 4 terminals at the rear side of the device: reference, sending, receiving and
termination resistance terminals.
Communications Protocols DEMCOM (DEMA communications protocol), MODBUS and IEC60870-5-103.
Communications Speed min. 1,200 baud, max. 38,400 baud.
Insulation Level 2,000 V / 1 min.
Connection Type Between CPM 311 Control Unit and PC.
Connection Usage USB serial port is used for establishing communications between CPM 311 and a
PC for using DEMA DigiConnect software.
Connection Point On the rear side of the control unit, USB B-type connector under the cover.
Communications Protocols DEMCOM (DEMA communications protocol) and MODBUS RTU.
Communications Speed min. 1,200 baud, max. 38,400 baud.
S1, S2, S3, S4, S5 Buttons Multifunctional buttons, functioning as described on the screen for each menu.
Reset Button Reset button has cyclic duty over LED, Alarm and Ampermeter menus. While at
any menu; first hit heads to the "Programmable LEDs" menu, second hit heads to
the "Alarm Menu" if any alarms are available, or to the "Ampermeters" menu if
there are no alarms to display. Hitting further returns to the initial menu.
1.7 Command Interface Buttons
1.6 USB Serial Communications Port
1.5 RS485 Serial Communications Port
Programmable Input Setting Options (Continued)