Yokogawa RAMC User Manual
Page 18
<3. INSTALLATION>
3-2
IM 01R01B02-00E-E 10th edition January 01, 2013 -00
All Rights Reserved. Copyright © 2003, Rota Yokogawa
3.2 Wiring of electronic transmitter (-E, -H) and limit
switches (/K_)
Please regard the drawings on the following pages.
On the rear of the RAMC are two cable glands for round cables with a diameter of 6 to 9 mm (not for Ex-d-type
option /_F1). Unused glands must be closed with a blind plug M16x1.5.
For wiring of RAMC with option /_F1 see chapter 10.9.2, 10.10.2, 10.13.2.
Wires should not be bent directly at terminal screws. Do not expose wires to mechanical pressure. Wires must
be arranged according to common installation rules, especially signal and power lines must not be bundled
together.
The RAMC terminals accept wires with a maximum sectional area of 1.5 mm
2
.
Measuring and indicating instruments, connected in series to the output of the electronic transmitter, must not
exceed a load impedance of
R
L
= (U - 13.5 V) / 20 mA — for 2-/3-wire RAMC or 500 Ω for 4-wire RAMC.
2- or 3-wire units are connected to the terminals marked “+”, “-” and “A” of the power connector.
For 2-wire instruments the terminals “-” and “A” have to be shorted with a jumper. Take care not to loose that
jumper when mounting wires.
Wiring inside the case should be kept as short as possible to avoid that moving parts are blocked.
Attention: Hints for Unit Safety (according DIN EN 61010)
- Heed the nominal voltage indicated on the scale.
- The electrical connections have to be executed according to VDE0100 “Errichten von Starkstromanlagen
mit Nennspannungen bis 1000 V” (Installation of high current assemblies with nominal voltages of up to 1000 V)
or equivalent national regulations.
- For units with a nominal voltage of 115 V or 230 V the correspondingly marked terminal has to be
connected to protective earth (PE).
- Units with a nominal voltage of 24 V may only be connected to a protected low voltage circuit (SELV-E
according to VDE0100/VDE 0106 or IEC 364/IEC 536).
- The RAMC indicator housing must be grounded to ensure electromagnetic interference protection.
This can be done by grounding the pipeline.
- This unit does not include a power switch. Therefore, a switch has to be prepared at the installation
location in the vicinity of the unit. The switch should be marked as the power separation switch for the
RAMC.