Securitron TM-2 - Manual (Page 3)

PN# 500-16000
Page 3 Rev. C, 04/11
4.4 SW5: INPUT VOLTAGE SETTING
In the factory set (off) position this switch selects 24 volt (high) operation. Turning it on selects
12 volt (low) operation. If the switch is in the "on" (low) position, the timer can be damaged if
operated on 24 volts.
5. RESET AND FLASH OUT TERMINALS
Terminal R is for reset. When it is momentarily connected to terminal "+", the unit resets and
goes into a condition equal to when it is first powered. When Dip Switches are changed, the
timer must be reset, either via terminal R or by unpowering and repowering it. If this
is not done, the changed Dip Switch settings may not be read. The reset function is also
useful to terminate a timing cycle early from an external switch.
The F terminal (flash out) permits connection of an external LED. See Figure 3 for the proper
way to connect an external LED. The external LED will operate in the same way as the LED on
the board.
The LED provides a unique type of annunciation which depends on the operating mode selected
for the unit. For the modes which include timing, the LED will flash at an increasing rate as the
delay expires. An externally mounted LED can therefore provide a visual indication for
how much time remains. This is particularly useful for the longer time ranges. For the
operating modes which do not include timing (pulse output and toggle), the LED follows the
relay status. It is on when the relay is energized. This is also a useful external visual indication.
FIG. 3: FLASH OUT CONNECTIONS TO EXTERNAL LED
R
T
F
RESISTOR
LED
DIODE
RESISTOR
LED
AC
C
O
N
N
EC
T
IO
N
DC
CO
NN
E
C
T
IO
N
IF THE TIMEMASTER IS POWERED FROM A DC SOURCE, USE THE CONNECTIONS SHOWN AT THE LEFT.
IF IT'S POWERED FROM AN AC SOURCE, A DIODE MUST BE ADDED AS SHOWN ON THE RIGHT.
RESISTOR VALUE MUST BE CALCULATED
TO SUIT INPUT POWER AND LED TYPE.
When the time is set to zero in the cyclic mode, the flash out can be employed as an LED flasher
to annunciate some condition on a panel (see section 6.5). The F terminal can only operate
a resistive load of less than 60 mA or the board will be damaged. It can not operate
any incandescent lamp.