GT3F-2AD24 IDEC, GT3F-2AD24 Datasheet - Page 41

• Manufacturer Part Number: GT3F-2AD24
• Description: Electromechanical General Purpose Timer
• Manufacturer: IDEC
• Type: Off Delayr

Specifications of GT3F-2AD24

• Leaded Process Compatible: No
• No. Of Pins: 8
• Peak Reflow Compatible (260 C): No
• Switch Function: DPDT
• Supply Voltage: 250VAC
• Time Range Min: 0.05s
• Supply Current: 5A
• Time Range Max: 600s
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

G
Load Current
With inductive, capacitive, and incandescent lamp loads, inrush current more
than 10 times the rated current may cause welded contacts and other undes-
ired effects. The inrush current and steady-state current must be taken into
consideration when specifying a timer.
Contact Protection
Switching an inductive load generates a counter-electromotive force (back
EMF) in the coil. The back EMF will cause arcing, which may shorten the con-
tact life and cause imperfect contact. Application of a protection circuit is
recommended to safeguard the contacts.
Temperature and Humidity
Use the timer within the operating temperature and operating humidity
ranges and prevent freezing or condensation. After the timer has been stored
below its operating temperature, leave the timer at room temperature for a
sufficient period of time to allow it to return to operating temperatures before
use.
Environment
Avoid contact between the timer and sulfurous or ammonia gases, organic
solvents (alcohol, benzine, thinner, etc.), strong alkaline substances, or strong
acids. Do not use the timer in an environment where such substances are
prevalent. Do not allow water to run or splash on the timer.
Vibration and Shock
Excessive vibration or shocks can cause the output contacts to bounce, the timer
should be used only within the operating extremes for vibration and shock resis-
tance. In applications with significant vibration or shock, use of hold down
springs or clips is recommended to secure a timer to its socket.
General Instructions
Timing accuracies are calculated from the following formulas:
Repeat Error
Voltage Error
T
T
Temperature Error
T
T
Setting Error
G-68
r:
v
t
20
: Average of measured values at °C
: Average of measured values at voltage V
Average of measured values at the rated voltage
: Average of measured values at 20°C
= ± 1 x Maximum Measured Value – Minimum Measured Value x 100%
= ± Tv - Tr x 100%
= ± Tt - T20 x 100%
= ± Average of Measured Values - Set Value x 100%
www.idec.com
Tr
T20
2
Maximum Scale Value
General Instructions for All Timer Series
Maximum Scale Value
Timing Accuracy Formulas
USA: (800) 262-IDEC or [phone], Canada: (888) 317-IDEC
Time Setting
The time range is calibrated at its maximum time scale; so it is desirable to
use the timer at a setting as close to its maximum time scale as possible. For
a more accurate time delay, adjust the control knob by measuring the operat-
ing time with a watch before application.
Input Contacts
Use mechanical contact switch or relay to supply power to the timer. When
driving the timer with a solid-state output device (such as a two-wire proxim-
ity switch, photoelectric switch, or solid-state relay), malfunction may be
caused by leakage current from the solid-state device. Since AC types com-
prise a capacitive load, the SSR dielectric strength should be two or more
times the power voltage when switching the timer power using an SSR.
Generally, it is desirable to use mechanical contacts whenever possible to
apply power to a timer or its signal inputs. When using solid state devices, be
cautious of inrushes and back-EMF that may exceed the ratings on such
devices. Some timers are specially designed so that signal inputs switch at a
lower voltage than is used to power the timer (models designated as “B"
type).
Timers