24 VDC Power CHARM specifications

Installation notes

This CHARM provides 24 VDC power to a single, three or four wire field device and monitors the power status.
You must inject the 24 VDC power at the Address Terminal on the baseplate on which the CHARM is installed.
This CHARM requires a CHARM Fused Injected Power Terminal Block.
Installing the CHARM on the terminal block connects the power that was injected at the Address Terminal to the screw terminals on the terminal block.
The 24 VDC Power CHARM requires no configuration in Control Studio and a CHARM I/O Card (CIOC) is not required to deliver power to the screw terminals on the terminal block. Therefore, the CHARM must be removed from the terminal block to disconnect power from the field devices.

Table: 24 VDC Power CHARM specifications
Item	Specification
Channel type	24 VDC power output
Status readback level for power Good	> 10 VDC
Status readback level for power Bad	< 5 VDC
Channel isolation	Status readback circuitry is optically isolated and factory tested to 1000 VDC. Output power has no isolation from the injection point.
Input power requirements	+24 VDC ±10% at 12 mA maximum: Input power from CIOC: +6.3 VDC ±3% at 32 mA maximum +24 VDC input power: none Injected power requirement: +24 VDC ±10% at 1.01 A maximum: 10 mA status readback 1 A maximum to load
CHARM heat dissipation	0.32 W

Figure: 24 VDC Power CHARM wiring diagram with Fused Injected Power Terminal Block

Figure: 24 VDC Power CHARM wiring diagram for 3-wire applications with Fused Injected Power Terminal Block

Figure: 24 VDC Power CHARM wiring diagram for 4-wire applications with Fused Injected Power Terminal Block