TIMING RANGE SELECTION
The Model A655 allows for the selection of five different
timing ranges. While operating in the “Hours:Minutes”
range, the colon will flash to give an indication that timing
is taking place. The correct timing range is selected using
switches #1, #2 and #3 on the seven switch DIP assembly
located on the inside of the timer. See the chart for the
correct switch settings.
TIME RANGE SELECTION CHART
SW1
SW2
SW3
TIMING RANGE
OFF
OFF
OFF
0.001 – 19.999 Sec.
OFF
OFF
ON
0.01 – 199.99 Sec.
OFF
ON
OFF
0.1 – 1999.9 Sec.
OFF
ON
ON
1 Sec.-190 Min., 59 Sec.
ON
OFF
OFF
1 Min.-199 Hrs., 59 Sec.
Note: OFF = Open ON = Closed
KEYPAD LOCKOUT SELECTION
The Keypad can be disabled to guard against accidental
changes by using switch #4 on the five switch DIP
assembly located on the inside of the timer. See the
chart below for the correct switch setting.
SW4
KEYPAD LOCKOUT
OFF
Keypad Enabled
ON
Keypad Disabled
Note: OFF = Open ON = Closed
PROGRAMMING THE TIME
After the timing mode and the timing range have both
been selected, the proper time delay value can now be
programmed.
The Model A655-8-3000 is equipped with a 10-year life,
replaceable lithium battery and can be programmed with-
out an outside power source. To program push the "SET"
button and the display will illuminate the timing range
selected. Four dashes will also appear indicating that no
set point is presently programmed. Depress the "SET" key
a second time and the word "SET" will now be illuminated
on the display along with four zeros. The desired time
value is now entered using the four increment keys.
Each key controls its own digit with the exception of the
left increment key which is used to set the left most 1 and
½ digits on the display (these increment to 19 before
returning to 0). With a timing range of “MIN:SEC” or
“HR:MIN”, the digit to the right of the colon will roll over
from 5 to 0. Holding a key depressed for longer than 1
second causes the digit to automatically increment at
the rate of 2 numbers per second until released. When
the digits on the display correspond to the desired time
value, pressing the “ENT” key will enter that value into
the memory.
The set point can be changed without interrupting the
timing cycle by following the normal programming proce-
dure. This new value will then be used on the next timing
cycle.
The set point can also be viewed without interrupting the
timing cycle by depressing the “SET” key. Press the
“ENT” key to return the display to the time remaining.
If the keypad lockout is enabled, you can still view the set
point by depressing the “SET” key but the set point cannot
be changed using the increment keys. To indicate that the
keypad is locked while a programmed value is being
viewed, the display alternates the numerical value with
the word “LOC”.
POWER FAILURE
If all power is lost during a timing cycle, the instantaneous
contacts will transfer back to their original state. When
power is restored, the timer will reset back to the set point
if programmed for “standard start” or continue from the
point of power interruption if programmed to “reverse
start”. The timer set point will be maintained.
INTERNAL SCHEMATIC
WIRING CONNECTIONS
Note: It is important that the metal bracket on the front of
the case be connected to earth ground. Mounting the
A655 in a grounded metal panel is satisfactory.
TYPICAL WIRING DIAGRAM
Dotted Lines Are External Wiring
Sustained Control Switch
Standard Start
Close to run and
Open to reset
Reverse Start
Close to reset and
Open to run
The above diagram shows the typical timer wiring for a
simple application involving the delayed closing and
opening of load circuits. Contacts may be wired in series
to achieve various timing schemes.
TIMING MODE SELECTION
The Model A655 is capable of performing two different
modes of timing operation; On-Delay, or Reverse Start,
Delay. The selection of the timing mode is accomplished
by setting DIP switches 5, 6 and 7 on the switch assembly
that is accessed when the timer is removed from its
mounting case.
SW5
SW6
SW7
TIMING MODE
OFF
OFF
OFF
On-Delay
OFF
ON
OFF
Reverse Start, Delay
Note: OFF = Open
ON = Closed
TIMING MODE DEFINITION
ON-DELAY
The supply voltage is applied at all times. When voltage
is applied to the control terminal, the instantaneous
contacts change state and timing begins. At the
completion of the timing period, the timed contacts
change state. Reset takes place upon removal of the
control voltage.
REVERSE START, DELAY
The supply voltage is applied at all times. When voltage
is applied to the control terminal, the instantaneous
contacts change state. When the voltage is removed
from the control terminal, the instantaneous contacts
change back to their original state and timing begins. At
the completion of the timing period, the timed contacts
change state. Reset takes place when voltage is once
again applied to the control terminal.
TIMING RANGES
ON-DELAY
REVERSE START, DELAY
INSTALLATION INSTRUCTIONS–A655-8-1000/1001/3000/3001
INSTALLATION INSTRUCTIONS–A655-8-1000/1001/3000/3001
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