The Hochiki CHQ-DRC2/M(SCI) is a marine-approved addressable dual relay controller with an integral short-circuit isolator (SCI) for the Hochiki ESP analogue addressable system. It gives two general-purpose changeover relay outputs, each driven separately, to control dampers or shut down plant and equipment. A monitored input can be used for local power supply fault monitoring or as a general-purpose input. It is approved to MED by DNV for marine use.
Key features
- Approved to MED by DNV; approved by VdS
- Loop powered with a single loop address, set by DIL switches
- Two independently controlled changeover relays rated 30 VDC, 1 A
- Auxiliary monitored input
- Integral short-circuit isolator
- Can be used with CHQ-BACKBOX to comply with BS 7671; raises the rating to IP65
- SIL2 and railway-approved variants available
Technical specifications
- Ordering code: CHQ-DRC2/M(SCI)
- Operating voltage: 17 to 41 VDC
- Low power mode: 170 µA
- Quiescent current: 300 µA (typical)
- Current consumption when polling: 22 mA ±20%
- Current in short circuit: 8 mA; maximum short-circuit current (loop): 1 A
- Relay contact rating: 30 VDC maximum, 1 A (resistive load)
- Input end-of-line resistor: 10 kΩ ±5%, 0.25 W
- Input thresholds: on = 470 Ω, short circuit <50 Ω, open circuit >100 kΩ
- Operating temperature: -10 °C to +50 °C
- Storage temperature: -30 °C to +60 °C
- Maximum humidity: 95% RH non-condensing (at 40 °C)
- Weight: 343 g (+235 g with lid and back box)
- Dimensions: 157 x 127 x 35 mm (module and lid); 79 mm deep with CHQ-BACKBOX
- Materials: white ABS module; semi-opaque black ABS lid as standard (white lid CHQ-LID(WHT) available)
- Approvals: DNV rules for classification (ships); IMO FSS Code chapter 9; location classes temperature B, humidity A, vibration A, EMC B
