TYPE TD-52
rate is not a linear function of rheostat setting,
since Rp gives a parallel resistive path. This has
the effect of expanding the scale for short times
and thereby permitting more accurate settings.
CHARACTERISTICS
TIME DELAY RANGE AND VOLTAGE RATING
Time Delay
Range (Seconds)
Voltage Rating
(Volts de)
.05-0.4
.05-0.4
.05-0.4
.05-1.0
.05-1.0
.05-1.0
0.2-4.0
0.2-4.0
0.2-4.0
1.5-30
1.5-30
1.5-30
24/32
48/125
250
24/32
48/125
250
24/32
48/125
250
24/32
48/125
250
BATTERY DRAIN OF EACH TIMER
STAND-BY:
OPERATING:
24 Volts de
0
500MA
32 Volts de
0
420MA
VOLTAGE RATING OVER THE
TEMPERATURE RANGE
The relay can operate between 105 to 140 volts
over a temperature range of -40°C. to +70°C.
REVERSE POLARITY
Diode (D1) limits reverse voltage of the static
components to less than one volt de, so that no
damage is <.lone to the circuit by connecting the
relay with reverse polarity. However, the relay
will, of course, not operate under this condition,
and series resistor (Rs) may over-heat if reverse
voltage is applied for approximately 15 minutes or
more.
4
lfD .
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IECTifiU
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IIOICATIICQ�
COiiT4CTOR
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FRONT ViEW
PRiliTEO!OARD
TERHIIIALS
i""l
TEIININAL
629A606
Fig.
3.
Internal Schematic of Type TD-52 Relay with Double
Trip 0.212.0 Ampere ICS Units.
48 Volts de
0
270MA
RESET TIME
125 Volts de
250 Volts de
0
180MA
0
80MA
TR drop-out time
=
0.1 sec. or less.
Discharge of timing capacitor: the discharge
of C is essentially instantaneous, the R-C time
constant through P being less than 20 milliseconds,
in most cases. However, the discharge path
through P is limited by silicon voltage drops
through SCR and D2, totaling approximately one
volt. Therefore, C discharges rapidly through P
down to about one volt and then more slowly
through Rp down to zero volts.
ACCURACY
The accuracy of the time delay depends upon
the repetition rate of consecutive timings, the
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