Brainboxes PX-246 Spezifikationen PDF herunterladen (Seite 77)

Commissioning and Fault Finding

11.4 COMMUNICATIONS

Symptom Possible Remedy

RS485 inoperative Check :

• Connection cable – Belden 9841 or equivalent

• 120Ω termination resistors are correctly fitted

• Baud rate of controller and of master device are the same

• Slave ID of the controller is the same as configured in the

master device

RS232 connection to PC

inoperative

Check :

• RS232 maximum of 15m is not exceeded

• Direct to PC connection requires a Crossover (NULL modem)

RS232 cable

• Baud rate of controller and of master device are the same

• Slave ID of the controller is the same as configured in the

master device

RS232 connection to GSM

modem inoperative

Check :

• RS232 maximum of 15m is not exceeded

• Modem Initialisation strings in the DSE configuration is

correct for the connected modem type

• Modem is configured to 9600 baud

• SIM card is CSD (circuit switched data) compatible

• SIM card is not PIN locked

• SIM card is correctly inserted

• Antenna is correctly installed and is not inside an earthed

metal cabinet / control panel

• A good signal is available in the locality

RS232 connection to landline

modem inoperative

Check :

• RS232 maximum of 15m is not exceeded

• Modem Initialisation strings in the DSE configuration is

correct for the connected modem type

• Modem is configured to 9600 baud

11.5 INSTRUMENTS

Symptom Possible Remedy

Inaccurate S1 & S2

measurements on controller

display

Check that the CT primary, CT secondary and VT ratio settings are

correct for the application.

Check that the CTs are wired correctly with regards to the direction of

current flow (p1,p2 and s1,s2) and additionally ensure that CTs are

connected to the correct phase (errors will occur if CT1 is connected

to phase 2).

Remember to consider the power factor. Ie (kW = kVA x powerfactor)

The controller is true RMS measuring so gives more accurate display

when compared with an ‘averaging’ meter such as an analogue panel

meter or some lower specified digital multimeters.

Accuracy of the controller is better than 1% of full scale. Ie S1 volts

full scale is 333V ph-n so accuracy is ±3.33V (1% of 333V).

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