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Siemens AG 1998 All Rights reserved 6SN1197–0AA00 02.98 Edition
SIMODRIVE 611 (PJ)
Start inhibit in the drive modules
!
Important
The functions ”safety stop” and ”setting–up operation” are not safety functions
in the sense of the Machinery Directive 89/392/EEC. They only support the
measures which have to be untertaken by the user himself.
Using the start inhibit
The ”start inhibit” function is provided in the SIMODRIVE 611 drive modules.
The start inhibit function prevents a feed–, main spindle– or induction motor
drive unexpectedly starting from standstill. This circuit macro can be used in the
”safe standstill” machine function. The external machine control must have initi-
ated and guaranteed that the machine has come to a complete standstill before-
hand. The power feed from the converter to the motor is interrupted with the
start inhibit (motor rotation). This is based on the Draft IEC 204 No. 44/184/CDV
from 15.06.95.
The remaining risk, is in this case, if two errors/faults occur simultaneously in
the power section; the motor rotates (jolts) through a small angle (1 FT motors:
4 pole 90°, 6 pole 60 °, 8–pole 45 °; induction motors: in the vicinity of the rema-
nence, max. 1 slot pitch, which approximately corresponds to 5 °15 °.
Electrical isolation is not provided by the start inhibit function, and it does
not provide protection against ”electric shock”.
The complete machine must always be electrically isolated from the line
supply through the main switch if any work is to be carried–out on the ma-
chine or system, e.g. maintenance service or cleaning work (EN
60204/5.3).
The start inhibit function, when correctly used, must be looped–in in the line
contactor circuit or emergency off circuit with the positively–driven signaling
contact AS1/AS2. The associated drive must be electrically isolated from the
supply if the start inhibit relay function is not plausible, referred to the machine
operating mode; e.g. via the line contactor in the infeed module. The start inhibit
and the associated operating mode may only be used again after the fault has
been removed.
As a result of a hazard analysis/risk analysis which must be executed ac-
cording to the Machinery Directive 89/392/EEC and EN 292;
pr EN 954; and pr EN 1050, the machine manufacturer must configure the
safety circuit for the complete machine taking into account all of the inte-
grated components for his machine types and version of them. This also
includes the electric drives.
9.5.1 Using the start inhibit
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