Rittal 7338.321, Mounting, Installation And Operating Instructions

Page: 25 / 86

Binary alarm states Binary failure states Messages
Extinguishing agent loss
Maintenance interval expired
Battery change required
The CMC-TC is the predecessor to the CMC III and does not have a CAN
‑
bus inter-
face. The three states „Failure” (Fig. 8 /6), „Fire alarm” (Fig. 8 /7) and „Pre-alarm”
(Fig. 8 /8) can be queried via the RJ12 connectors (Fig. 8 ) using a
CMC-TC I/O Unit.
3.3.4 Connection of external alarm device
An acoustic or visual alarm device can be
connected to the output "external alarm
device" (Fig. 9 /10). When the second fire
alarm threshold is reached, the output
switches the system voltage (21 V to 27 V)
to the connection technology at an output
current of ≤ 500 mA.
3.3.5 Manual call point connection
An externally accessible manual release
device (e.g. manual call point) can be inte-
grated in the manual call point connection
(Fig. 10 /12).
When connecting a release device,
observe the 1.8 k Ω terminating resistor.
3.3.6 Power supply
A 2-pole connection (Fig. 11 /14) with an
output current of 21 to 27 V DC is available
for the DET-AC III Slave power supply in
case of a DET-AC III Master and
DET-AC III Slave combination of extin-
guishing units. This output is protected by a
500 mA fuse and supplied with emergency
power.
Fig. 9: Connection of external alarm
device
Fig. 10: Manual call point connection
Fig. 11: Power supply
Structure, function and connections
Operating Instructions / DET-AC III Slave / 916007 / 05-2016 / en_US 25