Accelnet & Stepnet Plus Panels STO Manual 16-01338 Rev 00
Page 32 of 34 Copley Controls
10.0 Muting & Suspension of Safety Functions
10.1 STO Muting
Muting (bypassing) means de-activating the STO function. A convenient method for muting the STO function
is shown here for those installations that are not using the STO function.
An internal power source in the drive is brought out to the Safety connector. Connecting the STO inputs
between this bypass power source and its ground supplies power to the STO opto-couplers, energizing
them, and allowing the PWM outputs to be controlled by the drive. Figure 10 below shows the muting
connector circuit, and fig. 9 shows the jumper locations.
10.2 Muting Jumpers (STO Connector)
* STO bypass connections on the Plus Panel drives and Xenus Plus XEL/XPL models are different.
If both drives are installed in the same cabinet, the diode should be wired as shown to prevent
damage that could occur if the STO bypass connectors are installed on the wrong drive. The diode is
not required for STO bypass on the Plus Panel drives and can be replaced by a wire between pins 7
and 9 as shown above.
2-4, 3-5, 6-8, 7-9
Jumper Wiring, with diode:
2-4, 3-5, 6-8, 7-anode, 9-cathode
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