Z4-8MK4 Installation and User Guide v1.228
PSU capability and optional device current consumption
In addition to supplying the Zone Mixer’s circuitry, the internal PSU has the capacity to power some additional items which may
form part of a complete system. These include LM-2 active remote input modules (via the Facility Port), loudspeaker EQ cards
(tted internally), and possibly a PM Series paging microphone (powered via the Access Port).
The maximum current capacity of the PSU available for powering external items is 600 mA.
Current consumption of the various items is listed in the table below.
ITEM CURRENT PER UNIT
LM-2 mic/line input module 20 mA
PM-4 paging microphone 72 mA
PM-8 paging microphone 83 mA
PM-12 paging microphone 95 mA
PM-16 paging microphone 107 mA
Loudspeaker EQ cards (each) 6 - 34 mA*
*Model-dependent. See separate datasheets at www.cloud.co.uk
The installer should ensure that the total current drawn by all the external items in a system does not exceed 600 mA.
Note that PSU performance will be degraded at ambient temperatures in excess of 35°C.
Ground loops
If, despite your best efforts, the completed sound system ‘hums’ you probably have a ‘ground loop’. The offending signal source
can often be identied by setting the volume control to minimum, then disconnecting the input leads (both left & right channels)
on each line input until the ‘hum’ disappears. This problem is often caused by terminating a screened input cable into a signal
source positioned a signicant distance from the mixer. A good way of avoiding this potential problem is to use signal sources
(CD players and the like) that are double insulated with no connection to the mains supply earth. If a signal feed were derived
from a second mixer (a club or microphone mixer for example) it would be perfectly normal to expect this to be earthed; we
suggest that a transformer be used to isolate the signal and prevent a noisy loop (see page 10).
EMC considerations
The Cloud Z8MK4 & Z4MK4 fully conform to the relevant electromagnetic compatibility (EMC) standards and are technically well
behaved; you should experience no operational problems and under normal circumstances, no special precautions need to be
taken. If the unit is to be used within close proximity to potential sources of HF disturbance such as high power communications
transmitters, radar stations and the like, the performance of the mixer may be reduced; we suggest that the microphone cable
screen be connected to the equipment chassis and the line input leads are kept as short as possible.
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