Digital ON Delay & OFF Delay
The heart of a KD Series digital countdown off delay or on delay timer is a digital integrated circuit. The timer function is to provide either an off delay or on delay to a load such as a relay. Timing can be set as either fixed or variable by an external resistor or potentiometer.
Modules can be mounted to a circuit board as single or multiple units. With 1.75" leads, they can easily be wired to fit many applications requiring a miniature delay module. Available in standard and nonstandard voltages, the digital countdown timer series is versatile in time delay relay applications.
KD Series Icsotimers are available in two separate styles. The original KD series uses through-hole technology whereas the newer version is surface mount technology (SMT). Physically, the SMT series is slightly smaller in thickness due to the smaller components.
The SMT models have the advantage of being lower in price and smaller in size than the through-hole models. SMT part numbers have an "S" suffix. When ordering the SMT version, be sure to include the "S" suffix in the part number.
• Timing from 0.1 seconds to 10 hours
• Digital Countdown Delay Circuit
• AC Models 24, 120 and 240 VAC
• On or Off Delay Fixed or Adjustable
• Miniature PC Board
• Printed Circuit Mounting
• Thick Conformal Coating
• Through-Hole and SMT Models
Table 1. Part Number Selection
Timer Action:
(1) - ON Delay
(2) - OFF Delay
Timer Range:
Ranges from .1 second
to 10 hour OFF or ON
Standard Timing
(1) 0.1 to 10 second
(4) 1 to 60 second
(2) 10 to 600 second
(5) 1 to 60 minute
Nonstandard Timing
(3) 10 to 600 minute
(0) - *Special
*Customer defined
Input Voltage:
(AC or DC)
Standard Voltage
(2) 24 VAC
(1) 120 VAC
(8) 12 VDC
(4) 24 VDC
Nonstandard Voltage
(7) 12 VAC
(5) 240 VAC
(6) 48 VDC
(3) 110 VDC
Order Code Example:
KD = KD Series Microtimer
(2) = Timer Action = OFF Delay
(5) = Timer Range = 1 to 60 Minute
(1) = Input Voltage = 120 VAC
Add "S" suffix for SMT version.
Example: KD211S
*Options: Fixed and Special Time ranges from .05 seconds to hours.
Wiring. KD1 ON DELAY with ADJUSTABLE timing.
Wiring. KD1 ON DELAY with FIXED timing.
Wiring. KD2 OFF DELAY with ADJUSTABLE timing.
Wiring. KD2 OFF DELAY with FIXED timing.
Note. All wiring is shown from flat side with catalog numbers. Confirm wiring is correct before applying power. Heatsink leads when soldering close to module.
Input Current:
Idle (Action 2) = 5 ma.
Control Switch: (Action 2 Only) = 5 ma.
Output Voltage:
(Input voltage less on-state voltage drop)
On-state voltage drop
Action 1 (AC) = 2.5 VRMS
Action 1 (DC) = 3.0 VDC
Action 2 (AC) = 2.0 VRMS
Action 2 (DC) = 1.5 VDC
Output Current:
Maximum
Action 1, 2 = 500 ma.
Minimum
Action 1 (AC or DC) = 20 ma.
Action 2 (AC Only) = 20 ma.
Leakage
Action 1 (AC or DC) = 2 ma.
Action 2 (AC Only) = 2 ma.
Operating Parameters:
Repeat Accuracy
Fixed Conditions = ± .5%, ± 1 cycle for AC units.
Overall variation = ± 3%
Input Voltage Range
± 10% @ 50 or 60 Hz for AC units
± 10% @ 20% max. pp. ripple for DC units
Temperature Range
-10 °C to +70 °C operating
-20 °C to +85 °C storage
Reset time
Action 1, 2 = 50 ms.
Initiate time (Control Switch):
Action 2 = 50 ms.
Start-up (Action 5 & 6 Only):
Timer starts with Off cycle first
Typical Size (less leads):
Through-Hole Action 1 = 1.25"L x 1.1"W x .5" Thick
Through-Hole Action 2 = 1.38"L x 1.1"W x .5" Thick
SMT Action 1 = 1.25"L x 1.05"W x .4" Thick
SMT Action 2 DC = 1.4"L x 1.05"W x .3" Thick
SMT Action 2 AC = 1.4"L x 1.05"W x .4" Thick
Termination:
22 AWG solid tinned copper leads 1.75" Long
