Cloud Electronics PM16 - Manual (Page 22)

PM4/8/12/16 & PM4/8-SA Installation and User Guide v1.0 22
of this connector). (Note that this connector is also used for the internal chime
speaker.) Disconnect the gooseneck by undoing the three relevant screw terminals
on the connector.
The gooseneck itself may now be removed by undoing the 14 mm nut securing it to
the casing – a box spanner is the best tool for this.
Fitting the MI100166 gooseneck assembly is the reverse procedure. Fit the gooseneck
first and tighten the securing nut; then reconnect the twin-and-screen cable to the
connector block, observing the polarities shown on the PCB silk-screening adjacent
to the connector. Then replace the baseplate.
Power Requirements
The standard (non-SA) PM can be powered either by an external PSU, or from a
Cloud host mixer.
SA models of the PM can be powered either by the external PSU supplied with the
unit, or from a Cloud DCM-1 Digitally Controlled Mixer. They cannot be powered
from other Cloud host mixers such as the Z4
II
/Z8
II
or 46/50. If using a PM-SA with
these mixers, it must be powered by the supplied PSU.
Using an External PSU
An external power supply can be connected to the PM via the 2.1 mm coaxial power
socket on the rear panel. A suitable external PSU is the Cloud CPM-PSU; one is
supplied with each SA model, but may otherwise be obtained from Cloud Electronics.
Other AC or DC external supplies can be used with PMs, provided they are capable
of providing 107 mA (non-SA models), or 250 mA (SA models) at 9-17 V AC or
12-24 V DC.
IMPORTANT: Many DC adapters have poor regulation, and some nominally
24 V supplies can produce voltages sufficiently high to cause damage to the internal
electronics. If in doubt, use a 12 V AC adapter such as the CPM-PSU.
As the PM incorporates a full-wave rectifier circuit internally, the polarity of the
2.1mm jack is unimportant.
IMPORTANT: The external power supply should not have one side of its output
earthed, as this may introduce earth loops to the system. Most - but not all - plug-
top adapters meet this requirement, but installers should check for earth-to-output
continuity with a test meter if there is any doubt. The integrity of the system’s mains
earth should NEVER be compromised to meet this requirement, or to solve an earth
loop problem.