Appendix A: Safety Instructions – Ver. 1.00
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Most RHM provide a PE terminal and terminal for grounding via 1nF. If there is no capacitive
ground, special measures might be required.
Power supply and I/O circuits:
I/O and supply cables should be shielded when fed outside the control cabinet. When unshielded
wires are used outside a building, dedicated surge suppressors must be used.
NOTE:
The intrinsically safe circuits are connected to earth; along the intrinsically safe circuits
potential equalization must exist
A.6
Installation
All cable entries are for fixed installation only. Cables must be clamped to prevent pulling or
twisting.
The RHE28 has 2 openings M16 x 1.5 and 2 openings M25 x 1.5 for wiring. The openings M16 are
equipped with cable glands with a clamping range 6 – 10mm, the M25 openings are closed with
blind covers.
As accessories adaptors M25 to M20 and M25 cable glands are available.
For installation in a conduit system adaptors M25 to ½” NPT and M25 to ¾” NPT are available.
When installed in zone 2 or div 2, only certified cable glands must be used.
Special conditions for CSA certified units
RHE28 marked Class I, Div. 2, Group A, B, C, D and/or Class I, Zone 2, A/Ex db [ia Ga] IIC T4 Gb
1.
Shall be installed in class I, Division 2 / Zone 2 location.
2.
Potential equalization shall be provided along intrinsically safe circuits grounding.
RHE28 marked [Ex ia Ga]
1.
Shall be installed in ordinary (non-hazardous) location only.
2.
Potential equalization shall be provided along intrinsically safe circuits grounding.
A.7
Electrical connection of power supply and I/O
For the RHE28, Ex code AS or CS all I/O and supply terminals are rated for Um = 250V, therefor
no special voltage limiters are required.
For the RHE28, Ex code A2, AB, C2 or CB, the DC supply terminals and all I/O terminals are rated
for Um = 30V. If required suitable voltage limiters must be used.
National and local standards regarding electrical installations must be observed.
For information regarding function and usage of the different I/O and supply circuits refer to the
corresponding chapters of the main manual.
The USB interface must not be connected and used in hazardous areas.
Summary of Contents for RHE28
Page 27: ...RHE28 Installation Startup Guide Doc No 8 2 1 07 Ver 1 31 27 43 7 Ordering Code ...
Page 39: ...Appendix C CE Certificates 39 43 Appendix C CE Certificates ...
Page 40: ...Appendix C CE Certificates 40 43 ...
Page 41: ...Appendix C CE Certificates 41 43 ...
