mecair DPS - 4-20 mA Output Modes; Troubleshooting Guide

7
8. 4 -20 mA
It is possibile to select the 4-20 output in either active or passive modes.
Active: does not requie any external feeder.
Passive: it requires an external power supply between 18 / 24 V DC.
Move the two jumpers on the 4-20mA card [ F ] to select either the active or the passive mode.
The instrument is supplied in active mode.
9. TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
The display does not
switch on
Lack of power supply Check fuses F1
[ A ]
or F2
[ B
]
Check mains connections [ C ]
Pressure value is not
correct
Disconnect the hoses from the pressure
taps.
If the value is not zero, carry out a
Zero setting.
Reset the pressure value, refer to the
“Zero Pressure” item in the menu
The value transmitted
by the 4-20 mA is not
correct or is lacking
Wrong parameter adjustments
Wrong active/passive mode selection
Input correct parameters, see menu:
Full Scale 4-20
4 mA adjustment
20 mA adjustment
Check the jumper position on the 4-20
mA card [ F ]