Wiring Procedure; Supply Voltage Limiting Requirements - Honeywell RMA801 User Manual

2.4.3

Wiring Procedure

See Figure 12, for parts locations. Loosen the end cap lock using a 1.5 mm Allen wrench.
1.
Remove the end cap cover from the terminal block end of the electronics housing.
2.
Feed loop power leads through one end of the conduit entrances on either side of the
3.
electronics housing. The Remote Indicator accepts up to 16 AWG wire.
Plug the unused conduit entrance with a conduit plug appropriate for the environment.
4.
Follow the attached wiring diagram for respective connections with transmitters. Torque
5.
terminal screws to 0,6 N.m (5.3 lbf.in) to 0.8 N.m (7.0 lbf.in).
Connect the Loop Power wiring shield to earth ground only at the power supply side.
6.
Replace the end cap and secure it in place being careful not to damage the wires.
7.
ATTENTION
Ensure the RMA housing is properly earth grounded. It is
recommended to use 8AWG (or 8.37mm2) bare or green covered wire.
ATTENTION
The Remote Indicator is polarity-sensitive and has Reverse Polarity
Protection.
2.4.4

Supply Voltage Limiting Requirements

If the selected Remote Indicator complies with the ATEX 4 directive for self-declared approval per
94/9EC, the power supply must include a voltage-limiting device. Voltage must be limited such that it
does not exceed 30 V DC. Consult the process design system documentation.
Loop Supply Voltage
Requirement
Display Performance
13
Min. loop voltage = 2.3Vdc + MinVTx + (Rloop * 22mA)
Where:
MinVTx is the transmitter minimum supply voltage
Rloop is the resistance on the loop (in ohms)
The LCD display will turn blank below -20 ° C and above 70
° C
(-4° F and 158° F), rendering the display unreadable.
However, the loop will continue to function.
RMA803 Remote Indicator User's Guide Revision 2