Pressure Sensitive Device Connection; Two-Hand Device Connection - ABB Sentry USR22 Product Manual

Safety relays

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Two channels connection with OSSD external signals

7.6

Pressure sensitive device connection

Both T1/R1 and T2/R2 safety inputs must be used for this function. The total resistance of the

circuit including inactivated pressure sensitive devices and cables is shown in chapter.

A force activated pressure sensitive device will result in a short-circuit over T1/R1 and T2/R2. A

short-circuit will inactivate the safety relay output.

T1 and R1 shall be separated in different cables. T2 and R2 shall be separated in different

cables

Pressure sensitive device connection with square wave signals

7.7

A two-hand device has 2 NO and 2 NC contacts. These 4 contacts must be activated within 0.5

seconds in order for the signals to be accepted by the safety relay. If any of the 4 safety device

contacts is inactivated during the process the signal will be unaccepted.

A short-circuit to +24 VDC or 0 V will give an unaccepted signal. All 4 contacts must leave and

return to their unactuated positions before a new accepted signal can be given.

2TLC010073M0201 Rev.G

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