10-1
Chapter 10
Maintenance
10.1 Contents in this chapter
This chapter describes the items related to maintenance.
10.2 Planning of maintenance
The maintenance on a safety system is critical importance
for safety reasons.
You must plan and perform maintenance accordingly.
The SJ-P1 requires conducting the functional test at least
once in a year. When planning maintenance of the system,
this functional test must be considered.
10.3 Daily and periodical inspection
The SJ-P1 requires daily and periodical inspection in
addition to the functional test of the STO function. Please
perform inspections as instructed in the User’s Guide of SJ-
P1.
10.4 Periodical functional test
A periodical STO functional test must be performed at least
once in a year in order to maintain the intended safety
performance level of the STO function.
This periodical STO function test is one of the conditions
for the STO function of SJ-P1 to meet PLe of EN ISO13849-
1 and SIL 3 of IEC61800-5-2.
In the functional test, it is to be verified that output to the
motor is appropriately shut off and EDM signal is output as
intended (see the signal matrix in the following page)
The procedure of the functional test is as below:
(1)
Check if the EDM terminal (ED+ and ED-) is OFF (open)
when power to SJ-P1 is not supplied.
(State 1)
(2)
Power up SJ-P1 and set both ST1/ST2 to ON (Allow
operation: short), and then start motor operation.
(State 5)
(3)
Set both ST1 and ST2 to OFF (STO: open), and check if
the output to the motor is shut off and EDM terminal
(ED+ and ED-) is ON (Conducted).
(State 2)
(4)
Set both ST1 and ST2 to ON (Allow operation) and
then restart the motor operation.
(State 5)
(5)
Set only ST1 to OFF (STO: open) and check if the
output to the motor is shut off and EDM terminal (ED+
and ED-) is OFF. (State 3)
(6)
Set both ST1 and ST2 to ON (Allow operation) and
then restart motor operation. (State 5)
(7)
Set only ST2 to OFF (STO: open) and check if the
output to the motor is shut off and EDM terminal (ED+
and ED-) is OFF. (State 4)
When finding any state not following the signal matrix
below, there may be a fault in the safety path of the SJ-P1.
In that case, stop using the inverter immediately and
contact Hitachi distributor.
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Chapter 10 Maintenance
