E48329
Shawnee II Digital Reset Timer
MODEL NUMBER
PANEL MOUNTED DIGITAL TIMERS 355C Series
MODEL NUMBER 355C 30 P
RANGE
999.9 SEC 346
999.9 MIN 347
99.99 SEC 351
99.99 MIN 352
Special 000
VOLTAGE & FREQUENCY
120/60 A
240/60 B
120/50 C
240/50 D
ARRANGEMENT
With Display (On Delay) 30
FEATURES
Basic plug-in unit P
Standard unit X
Special K
ACCESSORIES:
Surface mounting bracket kit 353-260-27-00
Retrofit kit 305-265-61-70
A compact version of the 335 Timer, the ATC 355 is its exact func-
tional duplicate, packaged in a 72mm2 DIN-Size housing, it occupies
40% less panel space and costs proportionately less. Modern
production and assembly techniques have all but eliminated hand
wiring, enhancing the reliability and life expectancy of the 355.
COMPUTER TESTED RELIABILITY: The Solid-State 355 is manufac-
tured from a series of computer-tested plug-in circuit boards and
assembled virtually without hand wiring. Because it has no moving
parts in its logic circuits, its life expectancy is practically unlimited.
Even the load relay — the 355’s only significant mechanical compo-
nent — has a life expectancy of 100,000,000 operations (no load).
As a result, the 355 achieves an overall reliability that surpasses
even the high level achieved by previous Shawnee timers.
CYCLE PROGRESS INDICATION: The Shawnee indicating timer
provides cycle progress indication on a four-digit display located
immediately above the digital setting number wheels.
PLUG-IN AND DUST-TIGHT: All 355 timers feature true plug-in de-
sign and can be replaced in seconds without disturbing the housing
or disconnecting the wiring. The dial assembly is gasketed so that
the timer body is dust-tight from the front of panel.
WIDE RANGE: Each Shawnee 355 timer covers the overall span of
0.01 SEC to 999.9 MIN in two field-convertible ranges. The 355
indicating timer also offers two additional field-convertible ranges of
0.1-999.9 SEC or MIN
EASY TO SET AT ALL TIMES: The Shawnee timer is easily and ac-
curately set even with work gloves on. Push any of its four toggle
levers in any sequence until the number you want appears above
it. You can decrease as well as increase each number by pushing
the levers up or down. You can change the setting at any time, even
during a cycle.
SAVE 40% IN PANEL SPACE AND COST: Packaged in a 72mm2 DIN-
size housing, the 355 occupies 40% less panel space than previ-
ous IC timers. Modern production and assembly techniques have
substantially reduced manufacturing costs and resulted in a 45%
cost saving.
OUTSTANDING REPEAT ACCURACY: Unsurpassed among industrial
timers regardless of cost, the Shawnee has a repeat accuracy of
±10 milliseconds on any setting within its overall range of 999.9
MIN, even in the face of wide swings in temperature or voltage and
regardless of the amount of reset time between cycles.
NOISE IMMUNITY: The 355 does not have to be shielded: its trans-
former power supply, full-wave bridges, buffered logic and other
design characteristics render it immune to the electrical noise that is
encountered in typical industrial environments
The 355C Directly
Replaces 355B & 355A
Functional Replacement
for the 335 Timer
Automatic Timing & Controls
SPECIFICATIONS
RANGES 0.01 - 99.99 SEC
0.01 - 99.99 MIN
0.1 - 999.9 SEC
0.1 - 999.9 MIN
Four field-convertible ranges
TIMING Single Cycle interval or delay
MODES Repeat Cycle pulse (fixed at approx.
50 mSEC)
CYCLE 4 digit, 0.3 inch, high intensity, blue display
PROGRESS
INDICATOR
REPEAT ±0.01 SEC on all ranges
ACCURACY
RESET TIME 75 milliseconds
MINIMUM 99.99 SEC of MIN ranges: 0.01 SEC or MIN,
SETTING respectively
999.9 SEC or MIN ranges: 0.1 SEC or MIN,
respectively
LOAD Number two, one instantaneous and
RELAYS one delayed; both plug-in DPDT
Operate Time 20 mSEC, max.
Release Time instantaneous — 20 mSEC,
max. delayed — 75 mSEC, max.
Contact Rating 5 A at 120 VAC,
Life 100 million operations (no load)
TEMPERATURE 32° to 140°F (0 to 60°C)
RATING
POWER 120V 95-132V at 50 or 60 Hz
REQUIREMENTS inrush — 0.2 A
running — 0.04 A
240V 190-264V AT 50 OR 60 Hz
inrush — 0.1 A
running — 0.02 A
Clock Input
Voltage 95-132V rms (120V Model)
190-264V rms (240V Model)
Current 20 mA max.
Frequency 0 to 1000 Hz (sinusoidal)
TERMINALS 16 screw terminals accessible at rear; integral
wiring diagram on housing
HOUSING Plug-in design; completely gasketed, dust-tight
when panel-mounted
MOUNTING Standard Hardware is provided to mount
ACCESSORIES timer so that it is dust-tight from
See Accessory front of panel
section of Optional Surface mounting without and with
catalog front-facing terminals
NEMA 12 case (1 timer)
WEIGHT NET: 1 lb., 7 oz. SHIPPING: 2 lbs
OPERATION
The Shawnee 355 operates on a digital logic circuit with three main
elements: a clock which uses utility line frequency of 50 or 60 Hz
as its time base; a read-only-memory (ROM) whose output is set
by the timer's digital setting number wheels; and a comparator that
continuously examines the outputs of the clock and ROM.
When power is applied (start signal on), two things happen
simultaneously; the instantaneous DPDT relay is energized transferring
both sets of contact, and the clock circuit begins to count each cycle
of the utility line frequency. Translating this count into hundredths of
a second, the clock accumulates it and feeds it continuously to the
comparator. When clock output exactly equals the output of the ROM,
the comparator causes the 355C to time out.
At this point, (1) the DPDT delay relay is energized, immediately
transferring both sets of contacts and (2) the clock turns itself off
automatically. Since the clock stops counting even if the start signal
remains on, it is not necessary to tie up one of the 355C's delayed
contacts to do this job.
To reset the Shawnee 355, power must be removed from terminal 1
(L1) for 75 milliseconds or more. The 355 operates in the On-Delay
mode only, always resetting whenever there is a power outage and
starting a new cycle when power is restored.
CYCLE PROGRESS INDICATION: When the timer is in the reset
condition, the LED display is blank. During the timing cycle, the display
counts up from zero, thus always indicating the amount of time that
has elapsed since the start of cycle. At time-out, the display shows
total elapsed time and exactly equals the numbers on the digital setting
wheels.
PANEL MOUNTED DIGITAL TIMERS 355C Series
Switching Sequence: Assumes a
sustained closed start signal
(i.e. longer than the setting on
the digital display.)
RELAY CONTACTS Before During End of
Start Timing Cycle
Instantaneous 14-9/6-8
14-10/6-7
Delayed 11-12/4-5
11-13/4-3
BLACK-Circuit Closed GRAY-Circuit Open
Automatic Timing & Controls
DIMENSIONS (INCHES)TYPICAL INSTALLATIONS
POWER SUPPLY
CLOCK
INDEPENDENT LOADS
DEPENDENT LOADS
MOMENTARY STARTING
CONTACT
SUSTAINED STARTING
CONTACT
LOAD ENERGIZED
LOAD DE-ENERGIZED
DELAYED CONTACTS
Contacts transfer
simultaneously when
unit "times out" and
all digits are zero.
SUSTAINED START
All timers shown in "before star t"
position. Diagrams shown with power
off unless otherwise marked. Maximum
load current through any load carrying
contact is 5 amperes. Pilot lights leads
are brought out to terminal block. Pilot
light can be wired to show practically
any desired function timer energized,
cycle running instantaneous or delayed
switch closed. etc.
INSTANTANEOUS CONTACTS
Contacts are transferred when power
supply is energized, transferred back
as shown when de-energized.
WIRING
PANEL MOUNTED DIGITAL TIMERS 355C Series
MOMENTARY START
TERMINAL WIRING
Powered by TCPDF (www.tcpdf.org)Powered by TCPDF (www.tcpdf.org)
Powered by TCPDF (www.tcpdf.org)Powered by TCPDF (www.tcpdf.org)
Automatic Timing & Controls
Loading...