Fire Protection | Data sheet No. 43104 | Version 02-2016 |
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8
Control unit STG 1.2
for DRM ceiling smoke detector / DKM manual call point – bus compatible
Technical data
Supply voltage:
24 V AC + / -10%
24 V DC +15% / -10%
Power consumption:
250 mA (normal operation)
I
max
2.5 A (alarm – 20 detectors)
I
max
6.2 A (0.02 s short circuit)
Relay outputs:
Alarm:
1 changeover contact
240 V AC / 30 V DC, 8 A
1 NC
240 V AC / 30 V DC, 8 A
Contamination:
1 changeover contact
400 V AC / 300 V DC, 6 A
Failure:
1 changeover contact
400 V AC / 300 V DC, 6 A
Service:
1 changeover contact
(service mode)
400 V AC / 300 V DC, 6 A
Notifications:
Display:
Plain text display status
DRM / DKM, configuration
Alarm:
red LED
Contamination:
yellow LED
Failure:
yellow LED
Operation:
green LED
Housing:
plastic ABS
Dimensions (W x H x D):
160 x 85 x 50 mm
Installation:
DIN-rail, panel
Protection class:
IP20
Ambient temperature:
0 °C to 50 °C
Connection:
spring terminals 0.5 – 2.5 mm²
•
Can connect up to 99 DRM 3.3 or DRM 3.3-N
ceiling smoke detectors / DKM 3.3 manual call
points
•
Possible to query each detector as to status
and contamination
•
Large LCD display and 4 additional LEDs
•
RS485 Mod-Bus interface for informal
transmissions to the building management
system (BMS)
•
4 changeover contacts for alarm, failure,
service and contamination
•
1 NC for alarm
•
Monitoring for short circuits and cable breaks
Function
Up to 99 type DRM 3.3 or DRM 3.3-N/ DKM 3.3 ceiling smoke
detector or manual call points can be monitored by the STG con-
trol unit. The STG communicates with its connected detectors
by way of their security monitored system ring buses. Smoke
alarms, failure and contamination messages are all forwarded
from the detectors to the STG and shown on a display. This
makes it possible for a technician or custodian to supervise all
the connected detectors at a glance. The STG has one changeo-
ver relay each for alarm, contamination, failure and service mode
signalling. With the alarm message there is a relay available
which serves as an NC contact. With this relay the messages can
be reported to a central building management system (BMS).
The STG 1.2 additionally has an RS-485 interface to the BMS,
which also exports all of this data including the status of indivi-
dual detectors via a Modbus RTU protocol. With this interface it
is also possible to evaluate the STG via PLC control or a PC.
Important note:
In addition, please note the separate
DRM / DKM data sheets.
If an alarm occurs at one or more connected detectors, the red
LED lights up on the STG, a message is issued to the STG display,
and the corresponding NC contact and changeover contact at
the STG drop out. By pressing the reset button the relay contact
can be restored, but the corresponding alarm must be termina-
ted/disabled first. In case of failure, connection problems as well
as contamination of one or more of the detectors, the yellow
contamination LED on the STG lights up and the corresponding
changeover relay of the STG drops out. If no connection to a
duct smoke detector can be made, a failure message appears
on the STG. If a new detector is connected in the service mode,
a corresponding message appears on the display. If the STG is
in service mode the service relay drops out. Failure and alarm
messages of the connected detectors must be acknowledged
once more through the STG “alarm /reset” button.
