DI 120 VAC isolated CHARM specifications

Installation notes

When a CHARM Terminal Block is used, the input channel can be used as a conventional isolated input channel.
When a CHARM 3-Wire DI Fused Injected Power Terminal Block is used, the input channel can be used as a dry contact input channel.
The CHARM 3-Wire DI Fused Injected Power Terminal Block can be used to provide an additional connection point for 3-wire devices connected to this CHARM.
Although CHARMs can be installed in any location, it is good engineering practice to separate low voltage DC signals from high voltage AC signals. To ensure a safe working environment, it is recommended that you wire AC signals to a different enclosure from DC signals.
This CHARM can be configured as a pulse count input channel.

Table: DI 120 VAC isolated CHARM specifications
Item	Specification
Channel type	Discrete input: isolated 120 VAC
Detection level for On	>84 VAC
Detection level for Off	<34 VAC
Wetting current	2 mA at 120 VAC
Input impedance	60 kΩ (approximate)
Channel isolation	Input channel is optically isolated from the system at 250 VAC
Optional pulse count input frequency range	0.1 Hz to 10 Hz
Frequency	50 / 60 Hz
Maximum input voltage	130 VAC
Input power requirements	Total power requirement: +24 VDC ±10% at 12 mA maximum : Input power from CIOC: +6.3 VDC ±3% at 32 mA maximum +24 VDC input power: none
CHARM heat dissipation	0.41 W

Figure: DI 120 VAC isolated CHARM wiring diagram with CHARM Terminal Block

Figure: DI 120 VAC isolated CHARM wiring diagram for dry contact applications with CHARM Terminal Block

Figure: DI 120 VAC isolated CHARM wiring diagram for dry contact applications with CHARM 3-Wire DI Fused Injected Power Terminal Block

Figure: DI 120 VAC isolated CHARM wiring diagram for 3-wire applications with CHARM 3-Wire DI Fused Injected Power Terminal Block