
CITY CODE CHART*
Setting AM/PM (12 Hour) or 24 Hour Display
  Cat. No. : 
             T2DDT8
T2DDT7
Astro    Mini
ASTRONOMICAL TIME SWITCH
TERMINAL DETAILS : 
CONNECTION DIAGRAM:
OVERALL DIMENSIONS:
Red LED for Relay Status
110 to 240 VAC
6 keys with 1 recessed reset button  
  6 VA
+/- 1 s/day @ 25°C.  
3 Lines Text LCD 
Approx. 6 years running reserve
Annual clock with calendar up to 31.12.2099
00-23
00-59
Either AM/PM (12 h) or 24 h Clock
Programs and clock are reset to default
Auto/manual switching option
50/60 Hz
Based on:
1) Latitude/Longitude precision to the minute, with time zone.
2) Option for both Sunrise/set & Twilight rise/set.
3) DST feature- 1 hour (with indication on the screen).
4) Weekly OFF.
5) Offset facility.
6) OFF Hours
1 C/O (SPDT)
16 A (NO) and  @ 240 VAC / 24 VDC5 A (NC) 
1000 W
6 A @ 250 VAC
AgSnO
50 X 10
1 min
Operating Temperature Range -10°C to + 55°C
Storage Temperature Range
Utilization Category AC-15  Ue Rated Voltage
                                      
                                         
Utilization Category DC-13  Ue Rated Voltage
                                        Ie Rated Current
Base / Din Rail
Flame Retardant UL-94V0
110 g max
IP-20 for Terminals; IP-40 for Enclosure
-10°C to + 60°C
2.0 / 0.22 / 0.1 
24 / 125  / 250 
3.0 / 1.5 
120 / 240 
 Harmonic Current Emissions
Voltage Flicker & Fluctuation
Power Frequency Magnetic Field  
Voltage Dips and Interruption (AC)
Test Voltage between Input and Output
IEC 61000-3-2   Ed. 3.0 (2005-11) Class A
IEC 61000-3-3   Ed. 2.0 (2008-06) Class A
IEC 61000-4-3   Ed. 3.0 (2006-02) Level III
IEC 60947-5-1   Ed. 3.0 (2003-11) 2 kV
CISPR 14-1        Ed. 5.0 (2005-11) Class B 
CISPR 14-1        Ed. 5.0 (2005-11) Class B
IEC 61000-4-11 Ed. 2.0 (2004-03) Class B
IEC 61000-4-8   Ed. 1.1 (2001-03)
IEC 61000-4-6   Ed. 2.2 (2006-05) Level III
IEC 61000-4-5   Ed. 2.0 (2005-11) Level IV
IEC 61000-4-4   Ed. 2.0 (2004-07) Level IV
IEC 61000-4-2   Ed. 1.2 (2001-04) Level II
Impulse Voltage between Input and Output IEC 60947-5-1   Ed. 3.0 (2003-11) Level IV
IEC 61010-1      Ed. 2.0 (2001-02)
UL 508              Ed. 17  (1999-01) > 2000 M
UL 508              Ed. 17  (1999-01) < 3.5 mA
IEC 60068-2-1   Ed. 6.0 (2007-03)
IEC 60068-2-2   Ed. 5.0 (2007-07)
IEC 60068-2-6    Ed. 7.0  (2007-12) 5 g
IEC 60068-2-27 Ed. 4.0 (2008-02) 40 g, 6 ms
IEC 60068-2-27 Ed. 4.0 (2008-02) 30 g, 15 ms
2
30,000 cycles @ rated load
Power Consumption (Max.)
Minimum Switching Load
Minimum Switching Time
Supply Characteristics:
Electrical Fast Transients
Conducted Susceptibility
Environmental Testing:
Inductive Load (Cos o = 0.6)
Relay Output Characteristics:
Ie Rated Current
(V)
(A)
(V)
(A)
Maximum Operating Altitude 2000 m
Humidity (Non-Condensing) 95% Rh
2
3
40 mA at 24 VDC
-20% to +10%  of    ( ) 
 
Base / Din Rail Mounting
68.5
45.0
36.0
100.0 C/C
90.0
16
15
18
L N
MAN
RST
ESC  OK
Use Copper Conductors Only, 60/75° C.
TLL002_11
RoHS
Programming
Operating Frequency
Battery Backup
 LED Indication
 Day
Supply Variation
Modes
 Hour
 Minute
 Clock Format
 Reset
Contact Arrangement
Incandescent Lamps
Contact Material
Mechanical Life
Electrical Life
Number of keys
Enclosure
Weight (Unpacked)
Degree of Protection
EMI/EMC:
Supply Voltage (   ) 
 ESD
Radiated Susceptibility
Surge
Conducted Emission
Radiated Emission
Single fault
Insulation Resistance
Cold Heat
Dry Heat
Vibration
Repetitive Shock 
Non-repetitive Shock 
Safety:
Leakage Current
Pollution Degree
Others:
/
Contact Rating
Settings:
 
Mounting
LCD Display
Clock Accuracy
DIN RAIL 35mm
65.0
17.0
0.54 N.m (5 Lb.in)
Terminal screw - M2.5
1 x 0.2....3.3 mm
Solid Wire
1 x 24 to 12 
3.5 mm
AWG
NOTE: 
CAUTION:
FAQ’s (FREQUENTLY ASKED QUESTIONS):
Q.6:I want to switch OFF the output of Astro for a particular time 
interval  without  affecting  the  main  program.  Which  feature           
should I use?
A.6:You can use ‘OFF-Hours’ feature to switch OFF the output for 
a particular time period. To set OFF Hour feature,   select‘OTH’ 
menu and then select ‘OFHR’. 
Q.2:What is Manual switching (override)? When do we use it? 
A.2:When it is desired to switch ON/OFF the output before the 
actual event i.e. (ON/OFF event), manual override can be used. 
Press the MAN key for 3 s to toggle between ON Auto & Auto 
mode when relay (output) is OFF and to toggle between Auto OFF 
or Auto mode when the output is ON. 
Q.3:What should I do to reset all settings and Clock?
A.3:Press the Reset (RST) key. All settings will set to default 
and the clock will be reset to 00:00 & the date will be set to 
01/01/2000.
Q.4:How should I change clock format from 12 h to 24 h?
A.4:Press ‘    ’ & ‘MAN’ key to switch from 12 h to 24 h clock 
format and vice versa.
Q.5:How does ON AUTO and AUTO OFF feature help?
A.5:ON AUTO / AUTO OFF feature is used to immediately switch 
the output ON / OFF respectively, overriding the current output 
condition. If the output ON time is 6:15 p.m. & we want to switch 
ON the output earlier,  at  5:30 p.m. then set the mode as ‘ON 
Auto’. The output will be switched ON immediately. The mode will 
automatically change to ‘Auto’ at 6:15 p.m. which is the next auto 
event. Similarly the output can be switched OFF earlier than the 
output OFF time using the Auto OFF feature.
Q.1:In the event of power failure, do I lose all settings in the 
device?
A.1:No, the battery has a power reserve of approx 6 years at 
operating temperature range. In the absence of mains supply, 
we can program the device as per the requirement. However, 
during power failure, the relay or LED will not operate but the 
relay status can be observed on the screen.
Q.7:How can I switch the output ‘ON’ 30 min after sunset?
A.7:Use the Offset feature to change the ON time or OFF time of 
the  output.  To  set  offset,  select  ‘OUT’  menu  and  then  select 
‘OFSR’ to set offset for rise & ‘OFSS’ to set offset for set. To switch 
ON the output 30 min after sunset, set ‘OFSS’ as ‘POS’ (positive) 
and enter the time as 30 min. 
Q.8:I'm using Astro for my company's street lights and I want 
these  lights  to  be  switched  OFF  from  Saturday  evening  to 
Monday morning. Which feature  should I use?
A.8:You can use the Weekly-OFF feature for this purpose. To use 
this  feature,  select  ‘OTH’  menu  and  then  select  ‘WOFF’.  Then 
select ‘SA’ as the  start day.  Enter the start  time in  hours and 
minutes. Similarly, enter ‘MO’ as the end day and time in hours 
and minutes. If you have selected same day & time for start as 
well as end, then ‘WOFF’ is not applicable.  
1. Always follow instructions stated in this manual.
2. Before installation ensure that the specifications agree with 
    the intended application.
3. Installation should be done by skilled electrician only.
4. Inductive loads should be equipped with interference 
    supressors like varistors, RC snubbers.
5. Use of contactors is recommended if load exceeds the 
    contact rating.
1. If DST is applicable in your region, first set the DST and 
    then set the clock.
2. Due to properties of some lamps, it might take a few  
    minutes for the lamps to illuminate completely even after 
    the output has been switched ON.
3. Product innovation being a continuous process, we reserve 
    the right to alter specifications without prior notice.
Viewing the Output ON & OFF Time for the Day
ON
Ouptut OFF
Time
Output ON
Time
AUTO ON
OFF
00:00 07:07 18:10
SA
 
 
To view OFF & ON time for the day, press ‘   ’ & ‘   ’ 
respectively. This is possible only when the device is in run 
mode & not in edit mode. 
To change the time format from 12 h to 24 h & vice versa, 
press ‘    ’ & ‘MAN’ keys simultaneously.
To view the city code chart number, press ‘ESC’ key 4 times.
In case the city code chart is lost or misplaced, order the city
code chart by sending an email to:
download it from: www.gicindia.com  
L N 18
TS
N
P
NO NC
15 16
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