Chapter 3 Safety Related Information And Consideration; Contents In This Chapter; Chapter 4 Safety Function - Hitachi SJ Series Safety Function Manual

Chapter 3
Chapter 3 Safety Related
Information and Consideration

3.1 Contents in this chapter

This chapter describes safety-related information and
considerations.
3.2 Requirement of
Machinery Directive
In order to fulfill the requirements of the Machinery
Directive, the all requirements in the applicable standards
must be satisfied and P1-FS with the SJ-P1 inverters must
be used in accordance with the instructions provided in this
P1-FS Safety Function Guide, the Safety Function Guide and
the User's Guide of the SJ-P1.
Before using the inverter, the risk assessment of whole
system must be conducted and appropriate measures must
be adopted.
3.3 Intentional misuse
The SJ-P1 is not designed to protect a machine against
intentional misuse for Safety function.
3.4 Safety consideration
3.4.1
Safety function
The Safety functions of the P1-FS are functions equivalent
to STO (Safe torque off), SS1 (Safe stop 1), SBC (Safe brake
control), SLS (Safely-limited speed), SDI (Safe direction) or
SSM (Safe speed monitor) defined in IEC61800-5-2.
Safety Related information and consideration
3.4.2
Response time
The response time is defined as a time from input of Safety
request to actual activation of Safety function.
Refer to chapter 4 for each Safety function.
A safety-related system must be designed in consideration
of the above mentioned response time so that this delay
time may not lead to any dangerous situation.
3.4.3
Self-Diagnosis of internal path
The P1-FS is equipped with the self-diagnosis function
which detects a fault in the internal safety paths.
When an internal fault has been detected, the safety paths
are maintained shut-off state regardless of the states of the
Safety inputs to the P1-FS.
3.4.4
Safety Input
The Safety input of the P1-FS is redundant and the both
inputs must be input. The two Safety inputs must be
appropriately separated from each other. If only one of the
inputs is used, the conformities to the applicable norms
become invalid.
The P1-FS with the SJ-P1 inverter is equipped with a
diagnosis function of input signal and line from an external
device depending on the parameter settings. A system
must be designed so that both of the Safety inputs are
always given properly and simultaneously. As needed,
please set the test pulse function for diagnosing external
device which is able to detect a fault in Safety input lines.
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