Test Stop Interval Setting - Siemens SINAMICS CU240S DP-F Operating Instructions Manual

Commissioning
5.5 Commissioning using the BOP

Test stop interval setting

Parameter Description
P9659 = ... SI maximum time until test stop*
The time interval between test stops is specified in this parameter. The
remaining time until a test stop is required is shown in r9660. When
r9660 reaches zero, the time interval has expired and warning A1699
is activated. The warning solely informs that a test stop is required.
The user should activate a test stop on the next occasion. The drive
functionality will not be affected by the warning.
The test stop is activated in the following cases:
after each power-up
•
on selecting the STO when Bit 01 in P9601/P9801 is set
•
when leaving the latched safe torque off (LSTO).
•
During the test stop the shutdown paths are checked and a processor
selftest runs. The timer for the forced dynamisation (see r9660) is
reset to the default value specified in P9659 and warning A1699 is
cleared under the following conditions:
after reducing P9659 below the current value in r9660,
•
after each power-up
•
on selecting the STO when Bit 01 in P9601/P9801 is set and the
•
test is complete
when leaving the LSTO when the test is complete.
•
The default value is 8 hours.
Note:
For safety reasons, it is necessary to initiate the safe standstill as a
test at intervals of maximum one year in order to check the operability
of the fail-safe system. Thus, at the latest one year after the last
activation of the safe standstill the inverter sets a status bit (r9772,
Bit 15) and generates warning A1699. The process control (i.e. PLC)
must then initiate the STO at the next opportunity, for example, when
the drive has already a short phase with zero speed. Provided the
dynamisation has not been deactivated (see parameters
P9601/P9801, Bit 01), the fail-safe hardware is tested once the safe
standstill is active. If the inverter returns the "Safe torque off (STO)
selected" (r9772, Bit 01) status signal, the safe standstill can be
released again since part of the test is continued in the background.
The immediate switch-on will be inhibited for approximately 2.4
seconds. Once the self test is complete the dynamisation bit (Bit 15 of
r9772) is cleared automatically. The higher level control (i.e. PLC)
must log the setting and clearing of the status bit and the dynamisation
bit. To detect errors while writing and storing safety-relevant data, the
control should fetch cyclically at 8 hour intervals all safety-related
parameters and compare them with the expected values. Should there
be a difference, the fail-safe signals (STO or SS1) should be used to
initiate a safe standstill and to issue a fault message.
This action must also be logged appropriately.
86
Unit
h
Operating Instructions, 07/2008 - FW 3.2, A5E00766042B AD
Default Min. Max.
8.0 0.1 8760.0
Control Units CU240S