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MX4428 MXP Engineering / Technical Manual Document: LT0273
Device Information and Programming
Page 3-28 24 March 2006 Issue 1.5
3.13 814RB RELAY BASE
3.13.1 GENERAL
The 814RB detector base is designed as a low cost output device. The relay is controlled by
the detector which is plugged into the base, but the operation of the relay can be quite
separate from the operation of the detector. (Refer to section
3.3.)
The 814RB Relay Base provides two sets of volt-free, change-over contacts capable of
switching ancillary equipment rated at up to 1A resistive @ 30Vdc. One set is labelled NO,
C, NC (for normally open, common, and normally closed.) The other set is labelled 1 for NC,
2 for C, and 3 for NO. The terminals accept a single cable of up to 2.5 sqmm. Relay
operation is controlled by the MX4428 via an output from the detector. Hence, a detector
must be fitted to the base in order for the relay to operate as the relay base does not have
its own address.
The 814RB may be plugged into a MUB standard base, 5B standard base, or 5BI isolator
base, or mounted directly on the ceiling or wall.
3.13.2 SPECIFICATIONS
Line Connections L(–), L1(+)
Remote LED Connection R(–), L1(+)
Supply Voltage 20Vdc - 40Vdc
Supply Current 50uA (typical quiescent)
100uA (output active)
Relays Two changeover volt-free contacts
Switching current: 1A @ 30V dc
Resistance: On: 50mΩ Off: > 1 x 10
9
Ω .
Switching time: <10ms
Life expectancy: 100,000 operations
Dimensions 110mm (diameter) x 37mm (excluding detector)
Weight 153g
3.13.3 WIRING
Refer to Figure 3.3 for details of the relay terminals. Loop wiring and remote LED wiring is
the same as the MUB, refer to
Figure 3.1. Contact wiring connects to the following terminals
NC Normally Closed
C Common
First Pole
NO Normally Open
1 Normally Closed
2 Common
Second Pole
3 Normally Open