ABB T-1521Z Input card

Output of the conditioned tachometer signal. A signal with a carrying capacity of 1mA is available, which corresponds to a DC tachometer. Use a short, shielded cable for the wiring. The reference point is 4z (GND-REF). Scaling is 10V» - 6000 rpm. 10z, 12z, 14z NC, NC, NC These connections are not used (not connected), but they must not be applied with a voltage.

Together with 10d, 12d, 14d (track I-, track A-, track B-) 

these contacts form the outputs of the simulated incremental encoder signals. These outputs are designed as differential output drivers for each track. The output levels are >2,5V for high and <0,5V for low according to RS422, with a maximum carrying capacity of 20mA per channel. By this the TTL specification >2,4V for high and <0,8V for low is fulfilled

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