Earth Regimes; Fix The 4-20Ma Input - Honeywell OELD Operating Instructions Manual

OELD User Manual (3018M5000_1-3)
For example, three-core copper cable with screen (minimum 90% coverage) and suitable mechanical
protection (e.g. steel wire armor) to suit M20 gland entry.
The conductor size for the terminals is 0.2 – 2.5 mm
only copper wire sizes in the range 0.2 – 2.5 mm
12 AWG and temperature rating of conductor is greater than 80°C. The terminals should be torqued
to 5.5kgf.cm (5 lb-in).
Ensure the cable gland is installed correctly and fully tightened. All unused cable/conduit entries must
be sealed with a suitable certified blanking plug.

4.3 Earth Regimes

Caution: Any earthing regime employed must avoid earth loops.
The following information is provided to assist with proper earthing of OELD:
• OELD has a continuity plate which is in contact with the internal earth points provided (see Electrical
Connections). This is to facilitate connection of the sensor to protective earth.
• Locking rings are supplied which can be used to connect a sensor body or cable gland to the conti-
nuity plate where necessary.
• Field cable screens should be connected to instrument earth at the control room. The other end of
the field cable screen may be terminated in a spare terminal of OELD. It should not be connected to
the continuity plate.

4.4 Fix the 4-20mA Input

After electrical commission it is recommended to calibrate current input to OELD by using mobile
device.
The electrical adjustment procedure is as follows.
1. Short or open the current input ports at the OELD
2. Carry out mA input calibration with mobile device (Configure->Local display->Calibrate mA
input)
3. Re-wire the current input (mA)
For more information please refer to 7 OELD Mobile App
2
(24 - 12 AWG). The OELD terminals will accept
2
(solid core), 0.2 – 2.5 mm
Revision 1, Issue 3
2
(stranded core), or 24 –