Chapter 1 Safety Precaution/Risk; Contents In This Chapter - Hitachi SJ Series Safety Function Manual

Chapter 1

Chapter 1 Safety Precaution/Risk

1.1 Contents in this chapter

This chapter describes precautions for using the STO
function of the SJ-P1 inverter.
Before installation, wiring, operation, maintenance,
inspection and running, please make sure to read through
the Safety function Guide, the User's Guide of the SJ-P1
inverter and all the other documentation enclosed with the
product.
1.2 Safety Precaution
General warning indicates a potentially
hazardous situation that, if not avoided, can
result in serious injury or death, or damage
to the equipment.
This symbol indicates High voltage. It calls to
your attention to items or operations that
could be dangerous to you and other
persons operating this equipment.
1.2.1 Planning
The persons who design, install and perform maintenance
of safety-related system must have sufficient knowledge of
the functional safety.
It is a responsibility of the manufacturer of safety-related
system to perform risk analysis of the overall system and to
apply appropriate measures accordingly.
1.2.2 Consideration
in Designing safety-related system
The SJ-P1 does not support a holding function of STO state
after release of STO inputs. Therefore after STO inputs to
the SJ-P1 inverter are released, the SJ-P1 inverter becomes
available to restart the motor operation. (A function of SJ-
P1 to hold Shut off state without STO inputs is not safety-
related function.)
Please ensure to design a system so that the above-
mentioned behavior does not lead to any unsafe situation.
Please note that SJ-P1 inverters are delivered with the STO
function being disabled by a jumper wire to allow initial
drive commissioning without the need of configuring the
STO function first.
1.2.3 Installation
Installation must be performed by the competent
electricians who have sufficient knowledge of the
functional safety.
Ensure to use the SJ-P1 inverter within the specified
environmental condition including EMS environment.
1.2.4 Commissioning
The safety system must always be properly carried out the
commissioning and verified/validated before it is
considered safe.
1.2.5 Maintenance
The STO function does not cut the power supply to the
inverter and the peripheral circuits, and does not provide
any electrical isolation. Before maintenance, please ensure
to separate the system/machine from main power supply
lines and from the other devices which may supply any
voltage (e.g. permanent magnetic motor, device including
capacitors). Additionally, wait more than 10 minutes (*1) /
more than 15 minutes (*2) and check the charge lamp of
the inverter is disappeared, and then confirm that the
voltage between P and N terminal is lower than 45V before
performing maintenance.
A function test must be conducted at least once in a year.
*1) Type of P1-00044-L～P1-01240-L (P1-004L～P1-220L)
and P1-00041-H～00620-H (P1-007H～P1-220H)
*2) Type of P1-01530-L～P1-02950-L (P1-300L～P1-550L)
and P1-00770-H～P1-03160-H (P1-300H～P1-1320H)
1-1
Safety Precaution/Risk
1