© Danfoss | DCS (ADAP-KOOL®) | 2018.12
RI8SP202 | 3
DGS Installation Instructions
The DGS is available with one sensor or two sensors and B&L
(Buzzer and Light) as option (see figure 1).
For sensors that can be poisoned by e.g. silicones like all
semiconductor and catalytic bead sensors, it is imperative to
remove the protective cap only supplied only after all silicones are
dry, and then energize the device.
The sensor protection cap must be removed before taking the
DGS into operation
Mounting and Wiring
To wall mount the DGS, unscrew the lid by releasing the four
plastic screws in each corner and remove the lid. Mount the DGS
base to the wall by fitting screws through the holes which the lid
screws were fastened by. Complete the mounting by re-applying
the lid and fastening the screws.
The sensor head must always be mounted to point downwards.
The DGS-IR sensor head is sensitive to shock – special attention
should be paid to
protect the sensor head from shocks
during
installation and operation.
Observe the recommended location of the sensor head as stated
on page 1.
Extra cable glands are added by following the instruction in figure
2.
The exact position of the terminals for the sensors, alarm relays,
digital input and analogue output is shown in the connection
diagrams (see figure 3).
The technical requirements and regulations for wiring, electrical
security, as well as project specific and environmental must be
met.
Configuration
For convenient commissioning, the DGS is pre-configured and
parameterized with factory-set defaults. See Menu Survey.
Jumpers are used to change the analogue output type and the
Modbus baud rate. See fig. 3
For DGS with Buzzer & Light, alarm actions are given according to
following table:
System integration
To integrate the DGS with a Danfoss system manager or general
BMS system set the Modbus address using the DGS Service Tool,
using password "1234" when prompted. See the DGS User Guide
for details on operating the DGS Service Tool.
The Baud Rate is adjusted by jumper JP4. As default the setting is
38.4kBaud. For integration with AK-SM 720/350 change the setting
to 19.2kBaud.
For more information about data communication see
document RC8AC--
Sensor replacement
The sensor is connected to the DGS via a plug connection
enabling simple sensor exchange instead of an on-site calibration.
The internal X-change routine recognizes the exchanging process
and the exchanged sensor and re-starts the measurement mode
automatically.
The internal X-change routine examines the sensor for actual type
of gas and actual measuring range. If data does not match the
existing configuration, the built in status LED indicates an error. If
everything is OK the LED will light up green.
As an alternative, the on-site calibration via the DGS Service Tool
can be performed with the integrated, user friendly calibration
routine.
See the DGS User guide for details on operating the DGS Service
Tool.
Action
Reaction
Buzzer
Reaction
Light
Warning relay 1
SPDT NO (Normally Open)
Critical relay 3
SPDT NC (Normally closed)
Loss of power to DGS
OFF
OFF
X (closed)
Gas signal < warning alarm threshold
OFF
GREEN
Gas signal > warning alarm threshold
OFF
RED Slow flashing
X (closed)
Gas signal > critical alarm threshold
ON
RED Fast flashing
X (closed)
X (closed)
Gas signal ≥ critical alarm threshold,
but ackn. button pressed
OFF
(ON after delay)
RED Fast flashing
X (closed)*
(open)*
No alarm, no fault
OFF
GREEN
No fault, but maintenance due
OFF
GREEN Slow flashing
Sensor communication error
OFF
YELLOW
DGS in special mode
OFF
YELLOW flashing
Alarm thresholds can have the same value, therefore the relays and/or Buzzer and
Light can be triggered simultaneously.
The alarm thresholds have a hysteresis of app. 5%
* whether to include the relay status with the acknowledge function or not is user
defined
