Lenze E94P PositionServo with MVOB - Manual (Page 29)

S94H201E_13426446_EN L 27
Interface
Operation of the ISO 13849-1 Safety Circuit
ISO 13849-1 Cat 3, PL d designates that the enable function of the drive be designed in such a way that
a single fault in any of the parts of this enable circuit cannot lead to a loss of this safety function. The ISO
13849-1 safe torque off function has been designed and certified as meeting the requirements of this
standard.
PositionServo drives equipped with the ISO 13849-1 safety circuit option can be used in application
requiring conformance to this standard, and also in safety-related applications or in other applications
where the integrity of the enable / disable function is paramount to the safety of personnel and machinery.
The ISO 13849-1 safety circuit can interrupt the power supply to the motor without the AC line input to the
drive being removed. However, for the purposes of maintenance and mechanical work on the drive system
it is recommended that the AC (work swap) Line input be removed and the drives internal bus voltages
allowed to discharge before any such work is attempted. The ISO 13849-1 category 3 standard does not
provide for electrical safety of all components within the drive system.
For normal operation (enable) of the PositionServo drive, both the Safety Input 1 and Safety Input 2 are
required to be active. These inputs act as a Inhibit function, preventing the drive from being enabled until
both are active, and causing the drive to disable once either one or both of the inputs are removed. The
activation of both inputs will not automatically cause the drive to enable but will allow enable through the
standard methods provided for enable of the drive.
If an attempt is made to enable the drive by executing the program statement “ENABLE” or from activating
the input IN_A3 with the ISO 13849-1 safety inputs not being present then the drive will generate an ISO
13849-1 Safety Fault (F_EF).
When the drive is disabled through the ISO 13849-1 safety inputs (by removing the +24VDC assertion
level to either Safety Input 1 or Safety Input 2 or both while the drive is enabled) the drive output is turned
off and further torque cannot be produced by the drive in the motor. The drive will go to the “F_EF” fault
condition to indicate disable of the drive was by means of the safety circuits. With the drive output disabled
the motor will perform an uncontrolled stop or free-wheel deceleration to stand-still (unless driven by the
load). Rotation of the motor will not stop immediately and the time to reach standstill will depend on the
inertia contained within the system.
WARNING!
Ensure motion has stopped and the machine is in a safe condition before approaching the application.
If the system is required to be brought to zero speed on loss of the safety circuit function then a motor with
a fail-safe mechanical brake should be used and the necessary mechanism implemented.
Due to ISO 13849-1 regulations, a separate +24VDC external dedicated safety power supply must be
provided to the drive Safety circuits. The bypass +24V supply is intended for bypass purposes only and
must not be used as the control voltage to these circuits.
Installation and Connection
Connection of Two Safety Circuits with External +24V Supply
Pin Name Function
+
P1
P2
P3
P4
P5
P6
-
External
+24VDC
Safety Circuit
Input 1
Safety Circuit
Input 2
1 Bypass Voltage ISO 13849-1 Bypass Voltage (+24VDC)
2 Bypass COM ISO 13849-1 Bypass Common
3 Safety Status ISO 13849-1 Safety Status * 100mA max.
4 Safety Input1 ISO 13849-1 Safety Input 1 (+24VDC to Enable)
5 Safety COM ISO 13849-1 Safety Common
6 Safety Input2 ISO 13849-1 Safety Input 2 (+24VDC to Enable)