NIVELCO MultiCONT - 9.3. TROUBLESHOOTING

prw2101a0600p_01  98 / 105
9.3. TROUBLESHOOTING
9.3.1. It is impossible to enter the „Main menu”/”Relays” or „Main menu”/„Current outputs” menu:
There is no relay or current output in the unit. Check the number of relays and/or current outputs in „Main menu”/”MultiCONT config.”/”report” menu.
9.3.2. It is impossible to enter the „Main menu”/”Devices” menu:
The device list is empty. (there are neither inactive, nor active devices in the system, in measurement mode a „No HART Device” message appears on the display.)
9.3.3. A „Please wait” message appears upon selecting „DEV detect”
The HART line is so noisy, that there is no communication, and every command is bad. The only way to exit this state is by switching the unit off and on again.
Check the shielding of the cable and the cable route.
9.3.4. The result of „DEV detect” is the „No device” message
The MultiCONT did not detect any device that responded.
 Check for short-circuits or open-circuits.
There is a short-circuit if there is voltage between L+ and SH, but between L+ and L- the voltage is 0V.
 The line is open-circuited (cut) if there is no voltage between L- és SH, because there is no voltage drop on the sensing resistor ( R
fi
=255 ) connected
between these 2 points, whereas the loop current should never be 0mA.
 Check the terminal voltage at the devices (transmitters). If the terminal voltage is small, it might be due to bad wiring (big intermediate resistance) or big
loop current, resulting on a big voltage drop on the sensing resistor. Connect the devices in to the loop one by one, checking the „Short address” and the
constant current parameter (see: chapter on preparation of transmitters)
 Confirm that the device is HART capable (Type, nameplate)
9.3.5. The unit does not start up when switched on
It restarts repeatedly (see: chapter 5.9.)
 This can be due to faulty FLASH ( the non-volatile memory in the unit )
 Or a bad RS485 card ( types P__-1_A and P__-1_B ), because this is tested at boot, and does not continue in case of an error. Request help from our
Export Sales department.
9.3.6. The „Response” error entry is too frequent
The line is noisy, check the grounding of the cable shielding. If the cable is not shielded, replace it with a shielded cable.
DEVICES
L+ L- SH