Features: • Category 3 per EN 954-1• Stop category 1• Timed off-delay 0.15s to 30s• 2 Safety contacts• 1 Auxiliary contact• 1 Monitoring contactDescriptionThe 440R-S23173 is an off-delay timing unit which can be operated standalone or as an extension of a host r...
440R-S23173: Features: • Category 3 per EN 954-1• Stop category 1• Timed off-delay 0.15s to 30s• 2 Safety contacts• 1 Auxiliary contact• 1 Monitoring contactDescriptionThe 440...
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The 440R-S23173 is an off-delay timing unit which can be operated standalone or as an extension of a host relay. The timed outputs of 440R-S23173 are used in applications where power must be maintained for a fixed duration after an input signal is received. For example, driving a power to lock TLS2-GD2 to maintain a guard door in the locked position for a fixed duration after a stop button is pressed. Another example would be maintaining the connection of a drive to a motor until the braking function is achieved, and then dropping out a contactor to remove power to the motor.
The inputs of 440R-S23173 can be connected in either a single channel or dual channel configuration. The inputs must remain closed during the complete timing cycle. Opening the contacts before the timing cycle completes causes the timer to be reset to zero.
The 440R-S23173 has a redundant structure with two independent safe timer circuits. The outputs include two normally open safety delayed outputs as well as one normally closed safety output. The safety outputs of 440R-S23173 have independent and redundant internal contacts to help ensure the safety function. When used an extension of a host relay, the normally closed contacts should be used in the feedback loop of the host relay. If used in standalone application, the normally closed contacts can be used to signal an auxiliary device or PLC.
A typical operation starts of 440R-S23173 with power applied to A1/A2 and the input circuits open.
1. Close the B11/B12 and B21/B22 circuits.
a. The safety outputs (17/18 and 27/28) close immediately.
2. Open the B11/B12 or B21/B22 circuits.
a. The timing process starts.
b. The safety outputs (17/18 and 27/28) open after the time expires.
3. Go to Step 1.