Danfoss GDA Instructions page 6

ENGLISH
Refrigerants
GD can be used for the following refrigerants
Ammonia
• Type GDA
• 0-100 ppm
• 0-1,000 ppm
• 0-10,000 ppm
• 0-30,000 ppm
Carbon Dioxide
• Type GDC
• 0-10,000 ppm
Halo-Carbon
HCFC
• Type GDHC
• 0-1,000 ppm
HFC
• Type GDHF
• 0-1,000 ppm
Hydro-carbon
Propane
• Type GDH
• 0-5,000 ppm
Temperature range
Standard, LCD display, IP 65 and EExd (fig.1):
–20°C/+50°C (–4°F/122°F)
Low temperature model:
–40°C/+50°C (–40°F/122°F)
Enclosure
Standard IP 30 (NEMA 1)
LCD display IP 30 (NEMA 1)
IP 65 IP 65 (NEMA 4)
EExd IP 65 (NEMA 4)
Low temp. IP 40 (NEMA 2)
Cable connection
1 gland for 6-13 mm cable (0.2"-0.5")
1 Ø 20 mm (0.8") hole with blanking plug.
1 extra gland can be fitted.
Electrical data
All terminals will accept 0.5-1.5 mm
(20-15 AWG)
Supply voltage
12- 24 V a.c
12- 30 V d.c
Analog output
4-20 mA
0-10 V
0-5 V
RS 485 Communication to Danfoss m2
monitoring unit:
Digital output - dry contacts
Load: 1 A, 24 V a.c/d.c
Low alarm level
NO (default)
NC
High alarm level
NO (default)
NC
Installation
General procedure for all types of GD
products (fig. 2 and 3)
All GD products are for wall mounting.
6
• Remove top cover of GD.
• For the types Standard, LCD display and
Low Temperature (fig. 2):
• Unscrew two front screws
(four on Low Temperature)
• For the types IP 65 and EExd (fig. 3):
• Unscrew four front screws
Electrical installation (fig. 4 and 5)
Earth/Ground connection must be made
when using the standard, LCD display,
or EExd enclosure. The safety of the
equipment is dependent on the integrity of
the power supply and the earthing of the
enclosure.
Apply voltage at CON 1 and green LED will
go ON (fig. 5).
On power up the sensor may take some
time (minutes up to hours) to fully
normalize.
You can monitor this by checking the 0-10V
output at CON 3, as it falls down towards
zero.
During this normalisation period, the
yellow LED3 /red LED2 can go ON to
indicate Low/High Level alarms.
If changing any jumper - power must be
disconnected (CON1) to enable the new
jumper setting.
Setting of normally open (NO) / normally
closed (NC) for the digital output Low/
High Level alarm.
Both have an option to set at NO or NC.
Factory setting is NO.
Digital output Low Level alarm
NO : JP3 ON, JP4 OFF (removed)
NC : JP4 ON, JP3 OFF (removed)
(fig. 5)
Digital output High Level alarm
NO : JP5 ON in upper position
NC : JP5 ON in lower position
(fig. 5)
2
Manual reset / auto reset of Low/High
Level alarm (fig. 5)
Option available by means of JP8 (Low)
and JP7(High)
Factory setting is Auto Reset
If manual reset is selected for either Low/
High Level alarm then manual reset is by
push button located next to CON 7.
Digital output Low Level alarm
Auto Reset : JP8 in left hand position
Manual: JP8 in right hand position
Digital output High Level alarm
Auto Reset : JP7 in left hand position
Manual: JP7 in right hand position
Adjusting delayed response time (fig. 5)
Digital output for Low/High Level can be
delayed.
Factory setting is 0 Minutes
(GDHC and GDHF is 300 sec.)
Digital output Low Level alarm
JP1 in position
1 : 0 minutes
2 : 1 minutes
3 : 5 minutes
4 : 10 minutes
RI7HA352 © Danfoss A/S (RC-CMS / MWA), 02-2005
Digital output High Level alarm
JP2 in position
1 : 0 minutes
2 : 1 minutes
3 : 5 minutes
4 : 10 minutes
Adjusting Low/High alarm values (fig. 6)
All GD have been preset by the factory to
realistic values related to the actual ppm
range of the GD product.The actual Low
and High alarm ppm limits are detailed on
the external GD label.The factory preset
value can be adjusted, with a voltmeter
measuring the 0-5 V d.c output.
0 V corresponds to the min. ppm range
(e.g. 0 ppm)
5 V corresponds to the max. ppm range
(e.g. 1000)
E.g. if a setting of 350 ppm is required then
the voltage shall be set to 1.75 V (35 % of
5 V)
Adjusting the Low alarm limit value
Between TP0(-) and TP2(+) a voltage
between 0-5 V can be measured and with
that the ppm Low alarm limit setting.
The voltage/ppm setting can be adjusted
at RV1.
Adjusting the High alarm limit value
Between TP0(-) and TP3(+) a voltage
between 0-5 V can be measured and with
that the ppm High alarm limit setting.
The voltage/ppm setting can be adjusted
at RV2.
Connecting GD to a Danfoss m2
(fig. 7 and 8)
Wiring (fig. 7)
All GD must be connected
A-A
B-B
COM – COM (screen)
When connecting to the m2 panel the
same terminals are connected to each
other i.e. A-A, B-B, Com – Com.
On the last GD and Danfoss m2, fit a
120 ohm resistor across terminal A and B
to terminate the communications system.
Max. 31 gas detection sensors can be
connected.
If more than 31 units are needed, please
contact Danfoss for further information.
GD address (fig. 8)
The sensor address is set by S2 and S3,
adjusting these dials between 0 and F will
give the sensor its own address as shown
in fig. 8. A conversion chart between m2
channel numbers and the hexadecimal
address of the ST-IAM 2 is attached. Power
must be removed when setting addresses
on the GD.