MX4428 MXP Engineering / Technical Manual

Document: LT0273

Device Information and Programming

 

It is recommended that the PC program F4000CAL is used for conducting the loop loading calculations. However note that it does not include the isolator base loading, this must be done manually.

3.2.2DC LOAD

The total current available from the MX Loop terminals on the MXP is 400mA DC.

This must supply operating current to all addressable devices an the loop. This not only includes the quiescent current required to power the device electronics, but also the additional current drawn by devices in the ALARM state or by associated ALARM LEDs and other loop powered outputs.

The sum of currents for all devices connected to the loop is calculated using the “alarm current” values shown in Table 3-2.Note –

1)The MXP limits the number of Alarm LEDs turned on at any one time to 5 (programmable at MX4428).

2)Remote LEDs must be allowed for at 7mA each. Remote LEDs programmed to follow the detector LED will be limited by the number of alarm LEDs. However remote LEDs programmed to operate on “Circuit Alarm” or “Relay” will not be limited in any way.

3)LEDs on relay output devices (SNM800, RIM800, LPS800) will operate when the relay is activated, if the MXP is configured at the MX4428 to flash the LED on Poll “Global Blink Mode”.

4)The 814RB, RIM800 and SNM800 relay load current must not be supplied from the analogue loop.

The sum of all currents must not exceed 400mA.

Furthermore, the voltage drop in the cable must not exceed 16.0V, regardless of which end of the loop the cable is driven from. This is in order to ensure that with the minimum 36V voltage available from the MX Loop terminals on the MXP, the minimum voltage at any device will be at least 20V.

If you have any LPS800 devices on the loop, you may need to design for a higher minimum loop voltage and a lower voltage drop. Refer to section 3.23.2.

3.2.3AC LOADING

Calculate the total of the “AC Units” shown in Table 3-2.The total must not exceed 250.

Also ensure that the cable length does not exceed the values in Table 3-3.

Cable type

Cable length

MICC 2L1.5, 2L2.5, 1H1.5, 2H2.5

1.8 km*

Steel Wire Armour (SWA)

1.8 km*

Fire resistant ‘foil and drain wire’, e.g.

2 km

Radox FR3013, FP200, Lifeline, Firetuff

 

BS6883 marine cable

2 km

Table 3-3 Maximum Cable Lengths

*Up to 2km of these cable types may be used on condition that the maximum AC loading is restricted to less than 220 AC units per loop.

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24 March 2006

Issue 1.5

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Tyco MX4428 technical manual AC Loading, Cable type Cable length, Maximum Cable Lengths
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MX4428 specifications

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