Safety timers

Sentry TSR10 and Sentry USR models offer advanced timer functions such as off-delay, on-delay, time bypass and time reset. More information about these in the “Timer functions” tab below.
The time is set via the display, from 0 to 999 seconds with an accuracy of ± 1%.

Sentry TSR10 is suitable for e-stop buttons, safety switches and OSSD-devices.

Sentry USR10 and USR22 are suitable for most safety devices, i.e. emergency stop buttons, safety switches, OSSD-devices, two-hand devices and contact mats/bumpers/edges.

Main features

Up to PL e/SIL3
Advanced timer functions 0 to 999 seconds
- Precision of 0.1 second up to 100 seconds and 1 second over 100 seconds
- Accuracy of ± 1%
Simple configuration using display to select between preset configurations and custom configuration
Display with extensive status information
Removable terminal blocks
Extensive LED indication
Available with spring-loaded push-in terminals or screw terminals

Timer functions

Features

Timer functions with an accuracy of ± 1%

Several timer functions are available: On/Off-delay, time bypass and time reset.

On/Off-delays are used to postpone the activation/deactivation of the safety outputs with a preset time delay. This is used in e.g. Category 1 stops, where braking force is applied for a specified time before removing power from the machine.

Time bypass activates the safety outputs for a maximum predefined time when the safety inputs are closed. Inching is an example of an application where this is used. This results in the machine moving forward a very short distance for each activation by the user.

Time reset activates the safety outputs for a maximum predefined time when the safety inputs are opened. Pre-reset is an example of an application where time reset is used. This is useful e.g. when an operator cannot see the complete hazardous area from outside a closed door. A pre-reset button can be placed inside the hazardous area, to force the operator to go inside and check that no one is inside before starting a machine. After pressing the pre-reset, the operator has a limited time to go outside, close the door and press the second reset button in order to start the machine.

The timer functions can be set from 0 to 999 seconds with an accuracy of ± 1%. The precision of the timer is 0.1 second up to 100 seconds, and 1 second over 100 seconds. The accuracy and precision increases the safety and minimizes unnecessary downtime.
Illustration reset_2TLC010095F0201 (002)

Delayed outputs Some Sentry models have delayed outputs in order to e.g. give a machine time to apply breaking force before power is disconnected. For models with 2 NO + 2 NO outputs, it is only the second pair of NO outputs that is delayed. For models with 3 NO + 1 NC, all outputs are delayed.		Configurable models with display The models with display are configurable and the user can choose between preset configurations and a custom configuration that can be protected by password.
Light-button function The light-button function is used for the multi-reset function, but can also be used for a standard reset button. The function of the LED in the light-button is the following: on - at least one input is not accepted flashing - all inputs are accepted, reset possible off - all inputs accepted, reset performed, outputs active		Faster troubleshooting with display The display minimizes troubleshooting by giving extensive information about internal faults, I/O faults, system faults, function faults and a log of the last 10 errors
Time reset activates the safety outputs for a maximum predefined time when the safety inputs are opened. Pre-reset is an example of application. An accuracy of ± 1% allows a very precise time to be set in order to increase safety and minimize unnecessary downtime.
		Push-in terminals Spring loaded push-in terminals simplifies and minimizes installation time, and eliminates the need for retightening connections after transportation or in an application with vibrations.
Note: if an input is accepted it means that the door is closed, the light curtain is not interrupted, etc.		Powerful outputs The outputs have a switching capacity of up to 6A DC-13. This allows Sentry to drive larger contactors and saves the use of an intermediary contactor.