Connect power to LS I.S. CHARM I/O

Redundant 24 VDC power is delivered from bulk power supplies to LS I.S. CHARM I/O through the CHARMs Smart Logic Solver (CSLS) Carrier.

Note

In most cases, removing a CHARM from the CHARM baseplate removes power from any connected field device. However, CHARM type, terminal block type, and external power distribution can affect whether removing the CHARM removes power from a field device.

Note

In the following image, the power supplies and CSLS Carrier are installed in a Hazardous, Div. 2 or Zone 2, Group A, B, C, D location.

Figure: Powering and grounding LS I.S. CHARM I/O


For this procedure, it is assumed that redundant bulk 24 VDC power supplies and surge suppression/filter devices are already installed.

  1. Connect the AC power that is feeding the bulk power supplies to surge suppression/filter devices.
  2. Connect the bulk power supply to the power terminals on the CSLS Carrier as shown in the preceding image.
  3. Install either a 10 A or a 20 A fuse between the bulk power supply and the CHARM I/O Carrier.
    If your installation contains any standard, non-I.S. CHARMs, you must use a 20 A fuse. A 10 A fuse is suitable for use only in exclusively I.S. installations. 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 purchase a 20 A fuse and fuse holder, for use in non-ATEX, non-IECEX applications, from Emerson. Use the following model numbers to order the fuse and fuse holder:
    • SE4610T01: Fuse Holder and Fuse Assembly for 24VDC Power Supply of CHARMs Smart Logic Solver
    • KL4510X1-FA1: Replacement Fuse for SE4610T01 Fuse Holder Assembly
    • KL4510X1-GA1: Replacement Fuse Holder for SE4610T01 Fuse Holder Assembly
  4. Ground the connections as shown in the image.