A compact version of the versatile 333 Timer, the ATC 353 is its
exact functional 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 353.
CONTROL VERSATILITY: The 353 operates either as a repeat cycle
pulse generator or in single-cycle interval or delayed mode. You
choose the kind of control action you want by installing jumpers
on the terminal block. It also provides a choice of control output.
Choose a standard plug-in SPDT relay or optional SPST solid-state
switch module plus an independent-24VDC output signal at
Terminal 16.
COMPUTER TESTED RELIABILITY: The solid-state 353 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 unlim-
ited. Even the load relay — the 353’s only significant mechanical
component — has a life expectancy of 100,000,000 operations
(no load), while the optional solid-state switch module has virtually
unlimited life expectancy. As a result, the 353 achieves an overall
reliability that surpasses even the high level achieved by previous
Shawnee timers.
SAVE 40% IN PANEL SPACE AND COST: Packaged in a 72mm2
DIN-size housing, the 353 occupies 40% less panel space than
previous IC timers. Modern production and assembly techniques
have substantially reduced manufacturing costs and resulted in a
45% cost saving.
WIDE RANGE: Each Shawnee II 353 timer covers the overall span of
0.01 SEC to 999.9 MIN in four field-convertible ranges.
EASY TO SET: The Shawnee timer is easily and accurately 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.
NOISE IMMUNITY: The 353 does not have to be shielded: its
transformer power supply, full-wave bridges, buffered logic and
other design characteristics render it immune to the electrical noise
that is sometimes encountered in industrial environments thus
eliminating false starts and reset due to voltage spikes.
CYCLE PROGRESS INDICATION: The Shawnee 353 indicating timer
provides cycle progress indication on a four-digit display located
immediately above the digital setting number wheels.
OUTSTANDING REPEAT ACCURACY: Unsurpassed among industrial
timers regardless of cost, the Shawnee 353 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.
PLUG-IN AND DUST-TIGHT: All 353 timers feature true plug-in
design and are dust-tight from the front of panel.
E48329
Shawnee II Digital
Programmable Timer
MODEL NUMBER
MODEL NUMBER 353C 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
The 353C Directly
Replaces 353B & 353A
Functional Replacement
for the 333 Timer
PANEL MOUNTED DIGITAL TIMERS 353C Series
Automatic Timing & Controls
SPECIFICATIONS
RANGES Four field convertible ranges
0.01 - 99.99 SEC
0.01 - 99.99 MIN
0.1 - 999.9 SEC
0.1 - 999.9 MIN
TIMING Single cycle (interval or delayed) and repeat
MODES cycle pulse generator.
VOLTAGE REQUIREMENTS
START/RESET VOLTAGE REQUIREMENTS
SIGNAL Positive Polarity Ready at 4.5V min.
Reset at 1.0V max.
Negative Polarity Ready at 3.0V min.
Reset at 1.0V max
Max. Continuous Input 40V.
Ripple Voltage must not go below
minimum required
AC Line Voltage Input 5K ohms.
Impedance
RESET TIME
Circuit Reset 1 mSEC max.
Relay Drop-Out 20 mSEC max.
START SWITCH REQUIREMENTS
(ISOLATED CONTACT)
Switch Rating 10mA 30V
Min Open Resistance 1 megohm
Max. Closed Resistance 20K ohms
LATCHING MODE OPERATION
(INTERVAL ONLY)
PANEL MOUNTED DIGITAL TIMERS 353C Series
Min. Duration 50 μSEC
Start Signal
Max. Duration continuous
Start Signal
Reset when signal is removed
TEMPERATURE 32° to 140°F (0 to 60°C)
RATING
POWER 120V 95 to 132V, 50/60 Hz
REQUIREMENTS inrush – 0.4 A
running – 0.04 A
240V 190 to 264V, 50/60 Hz
inrush – 0.2 A
running – 0.02 A ±10%
DC POWER Voltage -24V ± 10%
SUPPLY OUTPUT Current 40 mA max.
(TERMINAL 7)
DC OUTPUT Voltage ON – -24V ± 10%
(TERMINAL 16) OFF – -1V or less
Current with relay–5 mA max.
without relay–40 mA max
Impedance on – 10 ohms max.
off – 10K ohms.
PULSE PULSE ON TIME(with relay): 80 mSEC ± 20 mSEC
GENERATOR (may be shortened or lengthened by installing a
OPERATION resistor or capacitor, respectively, across Terminals
4 and 11; see Operation Section for details.)
LOAD RELAY LIFE 100,000,000 operations (no load.)
CONTACT RATING: 5A at 120V AC
REPEAT ±0.01 SEC on all ranges.
ACCURACY
MINIMUM 99.99 SEC or MIN ranges: 0.01 SEC or MIN, respectively.
SETTING 999.9 SEC or MIN ranges: 0.1 SEC or MIN, respectively.
MOUNTING Standard Hardware is provided to mount timer so
ACCESSORIES that it is dust-tight from front of panel.
Optional Surface mounting without and with front
facing terminals. (See Accessory section
of catalog)
NEMA 12 NEMA 12 case (1 timer)
WEIGHT NET: 1 lb., 7 oz. Shipping: 2 lbs.
DIMENSIONS (INCHES)
WIRING
TERMINAL WIRING
Automatic Timing & Controls
OPERATION TYPICAL INSTALLATION
The Shawnee 353 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), the clock 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 353 times out.
At that instant, the clock turns itself off automatically.
At the same instant, the 353 generates one type of control action or
another, depending on how it is wired.
When the 353 is wired for interval operation, the timer’s output device
(either the standard SPDT relay or the optional SPST switch module) is
energized from the start to the end of the time cycle; so is the -24 VDC
output at terminal 16.
When the 353 is wired for delayed control, the output device is
energized at the end of the cycle and remains on until the timer is reset;
so is the -24 VDC output.
When the 353 is wired as a repeat cycle pulse generator, the output
device and the DC signal are both off until the end of the cycle, at
which time they are both on for about 80 mSEC. The length of the
pulse is included in the time cycle: the cycle runs from the start of one
pulse to the start of the next. The 353 automatically starts a new cycle
immediately after reset.
The duration of the standard output pulse generated by the 353 is 80
mSEC (±20 mSEC), but it can be easily lengthened or shortened by
using a capacitor or resistor across terminals 4 and 11. To shorten the
output pulse, the size of the resistor (fixed or variable) is calculated as
follows:
DELAYED MODE —
Sustained* start
INTERVAL MODE —
Sustained* or
momentary** start
INTERVAL MODE —
Sustained* start
PANEL MOUNTED DIGITAL TIMERS 353C Series
Where: t = time in milliseconds (± 25%) 2.2t - 2.64
R = resistance in megohms
(must be at least 0.2 megohm.) 80-t
To lengthen the output pulse, the size of the capacitor is calculated as
follows:
Where: T = time in seconds (± 25%) T - 0.08
C = capacitance in microfarads.
1.6
NOTE Observe Polarity: (+) Terminal of the capacitor goes to 11, (–)
Terminal to 4. To start from AC voltage, jumper terminals 8-9 and 4-11
and start with AC power at terminals 1 and 2.
_________
_________
=R
=C
REPEAT CYCLE PULSE
GENERATOR —
Uninterrupted start
signal
*Start switch must be closed — or DC start signal must be on —
for entire cycle. Timer resets when star t switch opens or DC start
signal turns off. To start from DC voltage, apply external ground on
11 and start signal on 9.
**Start switch may be closed — or DC start signal may be on —
for less that the entire cycle. Timer resets at end of cycle.
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Automatic Timing & Controls
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