Redundant 24 VDC power is
delivered from bulk power supplies to I.S. CHARM I/O through the CHARM I/O
Carrier.
Note
In the following image,
the power supplies and CHARM I/O Carrier are installed in a Hazardous, Div. 2
or Zone 2, Group A, B, C, D location.
Figure: Powering and grounding I.S. CHARM I/O
For this procedure, it is
assumed that redundant bulk 24 VDC power supplies are already installed.
Connect the bulk power supply to the power terminals on the CHARM
I/O Carrier shown in the preceding image.
Install a fuse between the bulk power supply and the CHARM I/O
Carrier.
The fuse must have a breaking capacity greater than 1500 A and a
Um rating of 40 V. The fuse and fuse holder must meet IEC60079-11 requirements.
You can order fuses and fuse holders from Emerson using the following model
numbers:
SE4610T01: Fuse Holder
and Fuse Assembly for 24VDC Power Supply of CHARM I/O Card
KL4510X1-FA1:
Replacement Fuse for SE4610T01 Fuseholder Assembly
KL4510X1-GA1:
Replacement Fuseholder for SE4610T01 Fuseholder Assembly
