Pilz PMCprimo DriveP.01/AA0/4/0/0/208-480VAC - Manual (Page 50)

Function description
Operating Manual PMCprotego S1­2(­C)
1002528­EN­02 50
4.3.11 Safe Brake Test ­ SBT
The safety function "Safe Brake Test" (SBT) is used to test the external (holding brake) plus
the internal brake (motor brake).
Features of the safety function:
} The servo amplifier receives a command to control the motor brake from the safety
card, via the internal interface.
} A mechanical brake is controlled via the 2­pole output "SBC+/SBC­" on the safety card.
The safety card monitors the following functions:
} During the brake test, the safety function SOS performs position monitoring.
} The brake test must be carried out cyclically within a defined test period, after 8 hours
at the latest.
} The test period and tolerance time can be set in the Configurator.
} After the safety card is switched on (changes state to RUN), the test period is deemed
to have elapsed and a brake test is required within the tolerance time.
Input and output assignment in the Configurator:
} Inputs I0 ... I6
– SBT Activate
} Outputs O0 … O3
– SSA Safe Standstill Acknowledge
– SBA Safe Brake Acknowledge
Prerequisites for normal operation:
} Input "SS1 Activate" and "SS1 SIL3/Reset": "1" Signal (+24 VDC)
} "Ready" output: "1" Signal (+24 VDC). The safety card is ready for operation.
} "STO Acknowledge" output: “0” Signal
} Output "SBC+/SBC­": "1" Signal (+24 VDC)
} Both outputs are simultaneously set to a "1" Signal: Voltage difference of 24 V between
SBC+ and SBC­.
} Input "SBT Activate": "1" Signal (+24 VDC)
} To achieve SIL3 or PL e: Connect the output "STO SIL3" to servo amplifier terminal
X4A/ 3.
Safety function is activated
} By a 1/0 pulse edge at the input "SBT Activate".
Reaction:
When two brakes are present (motor brake and external mechanical brake), the cycle t
2
– t
5
is repeated for the second brake (see timing diagram).
} SBT delay time starts
} After SBT delay time: Output "SBC+": "0" signal, brakes engage
} After delay time: Motor is supplied with 1.3 times the value of the maximum load.
Forces or torques that already affect the axis must be considered in the measurement,
e.g. suspended loads.