Cooper Security M2000 Podręcznik Użytkownika Pobierz pdf (Strona 157)

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Once you have identified a faulty cable/core then you can trace along its length to

locate the fault.

Note: An external power supply that does not have a “floating zero volts rail” will cause an earth

fault if it is connected to the network(s).

4. Make sure that the "Cable Segregation" advice given on page 9 has been followed.

Check that equipment is not sharing cables. For example detectors, speakers,

expanders and keypads should all be wired with their own cables.

5. Check for AC induced currents: Set the meter to measure low AC

voltages and

measure the voltage between the mains earth connection and the AUX +12V terminal,

then between the mains earth connection and 0V. The measurement should be less

than 6Vac in both cases. If the reading is greater than this, try to locate the source of

the interference (e.g. radio transmitters or electrical machinery). If the reading is

between 6 and 10Vac, installing a 12V Spike Suppressor (for example the ACT1313)

should help to reduce the effect. Connect the suppressor to 12V, 0V and mains earth.

Note; Avoid AC induction by making sure that the alarm cables do not run next to cables

carrying AC current, such as mains cables, mains switch boxes and category 5 (Cat5)

data cables.

If it is necessary to use screened cable, refer to the advice given under the heading

"General Wiring Considerations" in the M800 or M2000 Installation Instructions.

6. Check that cables do not exceed the maximum specified distances given on page 9. A

Networker Interface Board (NIB) can be used to increase cable distances (see page

11).

7. Make sure that no more than 3 branches are star connected to a control unit (see

page Figure 3) Maximum Distances to MSNodes).

8. Use option 2-7-3-6 (page 131) to check for network (data transmission) errors.

9. Check the AC voltage on the secondary side of the transformer in the control unit (i.e.

between the wires going from the transformer to the PCB). Set your meter to AC. You

should obtain a reading of between 17 and 21 Vac.

If the secondary voltage is low, with your meter still set to AC, check that the mains

voltage between Live and Neutral coming into the control unit transformer is between

225 and 254 Vac. WARNING: Mains voltages can cause serious injury!

10. If you think there may be a problem with a device such as a keypad: a) temporarily

disconnect all devices from a network at the control unit, b) wire the suspect keypad

(or other device) to that network on the control unit using a short length of new cable.

If the keypad (or other device) now works correctly, this indicates a problem with the

original cable run, the terminations or the output from the device that it was

connected to. If it still does not work correctly, there is possibly a fault with the device

itself.

Why are false alarms occurring?

Ensure that detectors have been positioned and installed correctly, in accordance with

normal good practice.

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