KTM Series Timers

A. Product Overview

The I-Therm KTM Series is a range of programmable digital timers developed for industrial timing and sequential control applications.

The series includes:

KTM-443: 48 x 48 mm panel size
KTM-773: 72 x 72 mm panel size
KTM-993: 96 x 96 mm panel size

The timers use a 3-digit single-row 7-segment LED display for clear indication of timing information.

The KTM Series allows the timer to count either upward or downward depending on the selected configuration. Timing ranges can be configured through the keyboard, allowing one timer to be adapted to different process requirements.

The timer range extends from 9.99 seconds up to 999 hours, making the KTM Series suitable for both short-duration and long-duration industrial timing applications.

Important features include:

• Programmable up and down counting
• Timing range from 9.99 seconds to 999 hours
• Time base selection through keyboard
• Hours, minutes and seconds timing options
• Programmable memory backup
• Two programmable outputs
• Cyclic timing operation
• Configurable Power On operation
• Multiple timer start options
• Universal 90 to 270 VAC supply
• 24 VDC supply available on request
• 3-digit LED display
• Multiple panel sizes
• Timing accuracy of 0.05 percent of full scale
• Repeat accuracy of 0.01 percent

The KTM Series combines programmable timing functions with multiple control options, allowing it to be integrated into industrial control panels and automated machinery.

B. Working Principle of the KTM Series Digital Timer

The KTM Series Digital Timer works by measuring a preset time interval and changing its output condition when the programmed timing sequence is completed.

The required time value and operating mode are configured through the front keyboard.

The timer can be configured for either:

Up Counting:
The timer starts from a lower value and counts upward until the programmed time is reached.

Down Counting:
The timer starts from the programmed value and counts downward until the timing period is completed.

The KTM Series provides different methods for starting the timing operation, including:

• Power On Start
• Front Panel Start
• Remote Pulse Start
• Remote Pulse and Level Start

Depending on the selected configuration, the timer can operate in modes such as:

• ON Delay
• OFF Delay
• Cyclic ON-Time First
• Cyclic OFF-Time First
• Forward and Reverse operation with Hold Time

The cyclic mode allows a timing sequence to repeat automatically using different time periods. This is useful where equipment must repeatedly switch between ON and OFF conditions according to predetermined intervals.

The timer also provides programmable output functions. The second output can be configured for functions such as auxiliary contact, instant contact or end-of-cycle operation.

Memory backup functionality allows programmed settings and timing-related information to be retained according to the selected configuration.

C. Why Is a Digital Timer Used?

A digital timer is used when an industrial process, machine or electrical system must perform an action after a defined period of time or according to a repeating timing sequence.

Manual timing can introduce inconsistency and depends on continuous operator involvement. A programmable digital timer provides repeatable automatic timing according to predefined settings.

The I-Therm KTM Series can be used where the process requires:

• Automatic switching after a preset time
• Delayed equipment starting
• Delayed equipment stopping
• Repeated ON and OFF cycles
• Up-counting or down-counting operation
• Equipment sequencing
• Timed machine operations
• Process duration control
• Automatic cycle control
• Remote timer starting
• End-of-cycle output generation

Its wide timing range allows the same timer series to handle processes measured in seconds, minutes or hours.

The programmable design also reduces the need to use separate fixed-range timers for different timing requirements.

D. Suitable Buyers

The I-Therm KTM Series Digital Timer is suitable for buyers who require reliable programmable timing control for industrial equipment.

Typical buyers include:

• Industrial automation companies
• Control panel manufacturers
• Machine manufacturers
• Original Equipment Manufacturers
• System integrators
• Electrical panel builders
• Factory maintenance departments
• Production departments
• Process automation companies
• Industrial equipment manufacturers
• Electrical contractors
• Machine automation engineers
• Industrial maintenance engineers
• Engineering companies

The KTM Series is particularly useful where a machine or process requires accurate time-based switching, cyclic operation, delayed operation or programmable timing sequences.

Frequently Asked Questions

1. What is the I-Therm KTM Series Digital Timer?

The I-Therm KTM Series is a programmable industrial digital timer designed for time-based control applications. It supports programmable timing, up and down counting, multiple start methods, cyclic operation, programmable outputs and memory backup.

2. Which models are available in the KTM Series?

The KTM Series includes KTM-443, KTM-773 and KTM-993 models.

3. What is the difference between KTM-443, KTM-773 and KTM-993?

The primary difference is the panel size.

KTM-443 has a 48 x 48 mm size.

KTM-773 has a 72 x 72 mm size.

KTM-993 has a 96 x 96 mm size.

The appropriate model can therefore be selected according to the control panel and display size requirement.

4. What is the timing range of the KTM Series Timer?

The KTM Series supports timing ranges from approximately 9.99 seconds up to 999 hours, depending on the selected time base and configuration.

5. Can the KTM Timer operate in seconds, minutes and hours?

Yes. The time base can be selected through the keyboard, allowing timing operation in seconds, minutes or hours according to the application requirement.

6. Can the KTM Series count upward and downward?

Yes. Programmable up and down counting is supported.

7. Does the KTM Series support cyclic timing?

Yes. The timer supports cyclic operation with different time ranges. This allows repetitive ON and OFF timing sequences to be configured for automated applications.

8. What timer modes are available?

Depending on the selected configuration, operating modes include ON Delay, OFF Delay, Cyclic ON-Time First, Cyclic OFF-Time First and Forward and Reverse operation with Hold Time.

9. How can the KTM Timer be started?

The timer supports different start methods, including Power On Start, Front Start and remote input-based starting.

10. Does the KTM Series have memory backup?

Yes. Programmable memory backup functionality is provided so that configured information can be retained according to the selected setting.

11. How many outputs are available?

The KTM Series provides two programmable outputs for implementing different timing and control functions.

12. What can the second output be used for?

The second output can be configured for functions such as an auxiliary contact, instant contact or end-of-cycle indication depending on the timer configuration.

13. What power supply does the KTM Series require?

The standard KTM Series supports a universal supply voltage of 90 to 270 VAC. A 24 VDC version is available on request.

14. What type of display is used?

The KTM-443, KTM-773 and KTM-993 use a 3-digit single-row 7-segment LED display.

15. What is the timing accuracy of the KTM Series?

The technical specifications state a set timing accuracy of 0.05 percent of full scale and repeat accuracy of 0.01 percent.

16. Is the KTM Series suitable for control panel installation?

Yes. The KTM Series is designed for panel-mounted industrial applications and is available in multiple panel sizes to suit different control panel designs.

17. Can the timer automatically start when power is switched on?

Yes. Power On Start is one of the supported timer start modes.

18. Can the KTM Timer be controlled remotely?

Yes. Remote pulse and input-based starting options are supported, allowing the timer to be integrated with external control systems.

19. Where can the KTM Series Digital Timer be used?

The timer can be integrated into industrial machinery, electrical panels and automation systems where delayed operation, cyclic timing, sequential control or preset time control is required.

20. How do I select between KTM-443, KTM-773 and KTM-993?

Selection mainly depends on the required panel size and display size. Choose KTM-443 for a compact 48 x 48 mm installation, KTM-773 for a 72 x 72 mm installation and KTM-993 for a larger 96 x 96 mm installation. The required timing functions, supply voltage and output configuration should also be confirmed before selection.