Aerotech Automation1 XC2, Hardware Manual, Page: 57 / 96

Non-standard STO delay times are provided by special factory order. In this case, the non-standard STO
delay time is indicated by a label placed on the slice amplifier’s main connector (STO DELAY = xx sec).
Table 2-28: STO Signal Delay
Value
STO Time Delay 450-550 msec
Table 2-29: Motor Function Relative to STO Input State
STO 1 STO 2 Motor Function
Unpowered Unpowered No force/torque
Unpowered
(1)
Powered
(1)
No force/torque
Powered
(1)
Unpowered
(1)
No force/torque
Powered Powered Normal Operation
1. This is considered a Fault Condition since STO 1 and STO 2 do not match. Refer to Section 2.4.4.
2.4.3. STO Startup Validation Testing
Verify the state of the STO 1 and STO 2 channels by manually activating the external STO hardware. Each
STO channel must be tested separately in order to detect potential short circuits between the channels.
The current state of the STO 1 and STO 2 inputs is shown in the Status Utility. A “–” indicates that the
STO input is powered by a high voltage level (24 V). An “ON” indicates that the voltage source has been
removed from the input (open circuit or 0 V), and that the STO channel is in the safe state.
DANGER : The STO circuit does not remove lethal voltage from the motor terminals. AC
mains power must be removed before servicing.
XC2 Hardware Manual 2.4. Safe Torque Off Input (STO)
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