User guide

Installation
DCM-1 User Manual v1.0 25
Zone paging outputs
If a CDPM paging microphone system is the only one being
used with a DCM-1, the DCM-1’s Paging Access connector
may be used to provide per‑zone paging control outputs.
These can be used, for example, to activate level restoration
in 100v line systems where local speaker volume controls
are installed. When a zone is paged from the CDPM system,
the control output for that zone activates (pulls down to 0v).
The Paging Access connector’s default conguration is as a
zone input connector for use with 3rd.‑party paging systems.
Re-assignment as an output connector is made via the menu
system. See page 34 for details.
The connector is a 10-way Phoenix type. The pinout is given
in the table below:
PIN FUNCTION
1 0V
2 Zone 1 active
3 Zone 2 active
4 Zone 3 active
5 Zone 4 active
6 Zone 5 active
7 Zone 6 active
8 Zone 7 active
9 Zone 8 active
10 +12V
For many systems, the DCM-1’s internal PSU will provide
sufcient current to activate an external relay in each zone.
Relays used in this way should have a coil voltage of 12v dc
and draw less than 60mA. The “Zone active” pins (2 - 9)
should be wired to one side of the level restoration relay
coils in the relevant zones. The other side of the relays
should be commoned together and connected to the +12v
pin (10). The diagram below illustrates this.
If the level restoration relay coils draw more than 60mA
per zone, additional intermediate relays and an external PSU
must be installed. The basic wiring scheme shown above is
used, but now the “External relays” will be the intermediate
relays instead of the restoration relays themselves. The
restoration relays are then wired via the intermediate
relays’ contacts to the external PSU, providing full electrical
isolation between the DCM-1 and the external level
restoration system. This is shown in the next diagram.
An external PSU should also be used in systems using relays
with a coil voltage higher than 12v. The “Zone active” pins
are rated up to 24v, so relays of up to 24v may be switched
directly as long as the current drawn remains below 60mA.
If either the maximum current rating of 60mA or the
maximum voltage rating of 24v is exceeded, intermediate
relays must be installed as per the above diagram.
With all wiring schemes, attention must be paid to relay
polarity when wiring such a system, as the external relays
will almost certainly have a diode in parallel with the relay
coil to limit voltage spikes when the relay releases. Ensure
that the positive (+ve, or red) terminal of the relay coil is
commoned to the +12v pin (pin 10) of the Paging Access
connector, or the positive terminal of an external PSU. The
negative (-ve, or black) terminal of the relay coil should
always be wired to the “Zone active” pin (2 - 9).
See page 53 for details of the DCM-1’s PSU capabilities.
PAGING ACCESS CONNECTOR
+12v1
0
v
865
4
3
2 7
External relays
(3 shown)
+ + +
---
External relays - internally powered
Intermediate relays
(3 shown)
EXT
PSU
+
-
PAGING ACCESS CONNECTOR
+12v
1
0v
8
6
5
4
3
2
7
+ + +
---
+
-
+
-
+
-
Restoration
relays
Level Restoration relay wiring: a) using intermediate relays for
isolation
PAGING ACCESS CONNECTOR
+12v1
0
v
865
4
3
2 7
External
relays
(3 shown)
EXT
PSU
+
-
+ + +
---
Level Restoration relay wiring: b) using external PSU for relays
with a higher coil voltage than 12v.