LS DO 24 VDC CHARMs specifications

Installation notes

The DeltaV system supports the LS DO 24 VDC DTA CHARM, the LS DO 24 VDC (Redundant DTA) CHARM, the LS DO 24 VDC ETA CHARM, and the LS DO 24 VDC (Redundant ETA) CHARM.

The LS DO 24 VDC DTA CHARM requires the CHARM Terminal Block. This CHARM is suitable for use in SIL 3 de-energize to trip (DTA) applications.
The LS DO 24 VDC ETA CHARM requires the CHARM Terminal Block. This CHARM is suitable for use in SIL 3 energize to trip (ETA) applications when deployed with a hardware fault tolerance of 1 (either redundant CHARM or redundant field elements).
The LS DO 24 VDC (Redundant DTA) CHARM can use the following terminal blocks:
- The LS Redundant Terminal Block
- For applications that drive a final element that requires more than 500 mA use the LS Redundant DTA Relay Terminal Block. The LS Redundant DTA Relay Terminal Block has a built-in relay that can handle up to 1 A and the redundancy allows for higher safety coverage to shut down the process.
- For applications that drive a final element that requires more than 500 mA, and also requires the use of the baseplate's injected power bus rather than system power, use the LS Redundant DTA Fused Injected Power Relay Terminal Block. The LS Redundant DTA Fused Injected Power Relay Terminal Block has a built-in relay that can handle up to 1 A and the redundancy allows for higher safety coverage to shut down the process.
This CHARM is suitable for use in SIL 3 de-energize to trip (DTA) applications.
The LS DO 24 VDC (Redundant ETA) CHARM requires the LS Redundant Terminal Block or the LS Redundant ETA Relay Terminal Block. This CHARM is suitable for use in SIL 2 energize to trip (ETA) applications.
The LS DO CHARMs have short circuit protection and support line monitoring for sensing field wiring faults such as open and short circuits. Line monitoring is enabled in the configuration.
Note
Line fault detection is not compatible with significant capacitive loading (cable + load > 30 nF) and must be disabled under these conditions.

Specifications

Table: LS DO 24 VDC CHARMs specifications
Item	Specification
Channel type	Discrete output: 24 VDC high-side
On-state output rating	24 VDC at 500 mA continuous per channel Channel power is derived from +24 VDC (±10%) power supplied to the CHARMs Smart Logic Solver Carrier.
On-state current limiting, channel protection	Output inrush current and short circuit protection: limited to 580 mA (typical) for simplex; 1.16 A for redundant when both CHARMs are operational.
Off-state leakage current	5 mA maximum with line fault enabled 300 µA simplex with line fault disabled 600 uA redundant with line fault disabled
Line fault detection levels	Guaranteed short circuit: 10 Ω Guaranteed good status: 56 Ω to 3.5 kΩ load Guaranteed open circuit: >20 kΩ load
Line fault test timing	200 µsec
Input power requirements	Total power requirement: +24 VDC ±10% at: 41 mA maximum, plus load current per simplex CHARM 82 mA maximum, plus load current per redundant CHARM pair Input power from CSLS Power Modules: +6.3 VDC ± 3% at 60 mA maximum per CHARM 24 VDC input power: +24 VDC ±10% at 20 mA maximum plus load current Total power requirement for redundant pair driving relay terminal: +24 VDC ±10% at 109 mA maximum: Input power from CSLS Power Modules:+6.3 VDC ± 3% at 120 mA maximum per CHARM +24 VDC input power: +24 VDC ±10% at 69 mA maximum
CHARM heat dissipation	1.3 W

Wiring diagrams

Figure: LS DO 24 VDC DTA Simplex CHARM wiring diagram with CHARM Terminal Block

Figure: LS DO 24 VDC ETA Simplex CHARM wiring diagram with CHARM Terminal Block

Figure: LS DO 24 VDC (Redundant DTA) CHARM wiring diagram with LS Redundant Terminal Block

Figure: LS DO 24 VDC (Redundant ETA) CHARM wiring diagram with LS Redundant Terminal Block

Figure: LS DO 24 VDC (Redundant DTA) CHARM wiring diagram with LS Redundant DTA Relay Terminal Block

Figure: LS DO 24 VDC (Redundant DTA) CHARM wiring diagram with LS Redundant DTA Fused Injected Power Relay Terminal Block

Figure: LS DO 24 VDC (Redundant ETA) CHARM wiring diagram with LS Redundant ETA Relay Terminal Block