selec
XT 242
S
QUIT
SET
1
2
M
H
RST
ENT
MODE
OPERATING INSTRUCTIONS
(Specifications subject to change as development is a continuous process)
selectron Process Controls Pvt. Ltd., TEL: 28471882, 28476443 FAX : 2847 1733 E-mail - selectron@vsnl.com Website: www.selecindia.com
Document name: Operating / 0410/XT242/standard/ version4 OP007-V4(page 1 of 2)
SPECIFICATIONS :
DISPLAY Current value: 4 digit red.
Set value: 4 digit green, both 0.5" height.
SET POINTS 2.
TIME RANGES 99.99 / 999.9 / 9999 sec, 99:59 min:sec,
999.9 / 9999 min, 999.9 / 9999 hr.
COUNTING
DIRECTION Up / Down.
BATCH
COUNTS Up to 9999.
MODES a) ON delay b) Interval c) Cyclic ON first
d)Cyclic OFF first.
TIME SETTING By front keypad.
MEMORY 10 years.
LED INDICATION a) Relay status b) Time unit (sec / min / hr)
Note: When timing is in progress unit LED
blinks to indicate timing on & unit of range.
When timing is in hold mode, blinking stops.
OUTPUTS 2 C/O (DPDT).
RELAY RATING 5A @ 230 V AC/ 28 V DC resistive load.
INPUTS a) Start b) Reset
CONFIGURATION via rear terminals.
LOCK
RESET a) Front panel.
b) Rear terminal.
c) ON power interruption (programmable).
RESET TIME Less than 100 msec.
ACCURACY ± 0.05% or 50 msec whichever is greater.
SUPPLY 90 to 270V AC/DC @ 50/60Hz.
MOUNTING Panel mounting.
HOUSING ABS.
WEIGHT 375 gms. (approx).
o
TEMPERATURE Operating: 0 to 50 C.
o
Storage: -5 to 55 C.
HUMIDITY 95% RH.
3 RESET
4 COM for Start / Reset
5 START
7 NO of relay 1
8 COM of relay 1
9 NC of relay 1
10 NO of relay 2
11 COM of relay 2
12 NC of relay 2
13 & 14 Configuration lock
15 LIVE (SUPPLY)
16 NEUTRAL (SUPPLY)
TERMINAL CONNECTIONS
L
N
RELAY1
RELAY2
COM COMNC NC
NO NO
1 2 3 4 5 6
13
14
15
16
7 8 9 10 11 12
RST
STRT
COM
CONFIGURATION
LOCK
Reset
Start
ELECTRICAL PRECAUTIONS DURING USE
eparate shielded wires for inputs.
High voltage spikes are generated in industrial electrical systems due to the
switching / operation of inductive loads, termed as 'Noise'. Noise can create
momentary disruption, erratic display, latch up, data loss or permanent dam-
age to the instrument. To reduce noise:
a) Use of MOV across supply of timer & snubber circuits across loads are re-
commended
b) Use s
Front view
72
72
Side view
68
115
Panel cutout
69
69
10
RESETTING THE XT242
A) By front key : (programmable)
2. By
B) Remote reset : The XT242 can be reset from a remote
push button as shown in the figure.
1. By pressing ENT key continuously for 3 sec.
pressing ENT key momentary
1 2 3 4 5 6
RST
COM
Reset switch
OPERATING MODES :
t
Supply voltage
Start Contact
NO Contact
t = Set delay time
Function : On delay-pulse
start
tt
Supply Voltage
Reset Contact
NO Contact
t = Delay time
Function : Reset
t
1
t
2
Supply
Voltage
NO
Contact
t = On time, t = off time
12
Function : Cyclic
(On time first)
t
2
t
1
Supply
Voltage
NO
Contact
t = On time, t = off time
12
Function : Cyclic
(Off time first)
t
Supply
Voltage
NO
Contact
t = Set delay time
Function : On delay
t
Supply
Voltage
NO
Contact
t = Set delay time
Function : Interval delay
t
2
t
1
Supply voltage
Gate Contact
NO Contact
t=delay time = t +t , t = hold time
12h
Function: Gate start-On delay
t
h
Supply voltage
NO Contact
S = Start up time
t1 = On time, t2 = Off time
Function : Cyclic (ON time first)
at S1 & S2 start up time given
Supply voltage
NO Contact
S = Start up time
t1 = On time, t2 = Off time
Function : Cyclic (OFF time first)
at S1 & S2 start time given
t1 t1
S
t2 t2
t2 t2
S
t1 t1
NOTE: Use snubber across inductive load to increase life of the internal
relay of the timer.
TYPICAL CONNECTIONS FOR LOADS :
1)
N
L
C NO
T
LOAD
R C
T
Snubber
T
T
C NO
N
L
Contactor
LOAD
C
Snubber
R C
2)
selec
XT242
DUAL SET POINT PROGRAMMABLE TIMER
TERMINAL
DESCRIPTION
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