9
05.01
9.5 Start inhibit in the drive modules
9-240
Siemens AG 2001 All rights reserved
SIMODRIVE 611 Planning Guide (PJU) – 05.01 Edition
9.5 Start inhibit in the drive modules
Notice
The start inhibit function is not a safety function in the sense of the Machinery
Guidelines 89/392/EC. It only supports the measures which the user has to
make.
9.5.1 Reason for using the start inhibit (IEC 204 No. 44/184/CDV)
The ”start inhibit” function is included in the SIMODRIVE 611 drive modules.
The power feed from the converter to the motor is interrupted with the start
inhibit (motor rotation). This is based on Standard IEC 204 No. 44/184/CDV.
The start inhibit prevents feed, main spindle or induction motor drives unexpec-
tedly starting from standstill. This circuit macro can be used in the “Safe stand-
still” machine function. However, beforehand, the must have been brought to a
complete standstill and ensured using the external machine control.
This is especially valid for vertical axes without any self–locking mechanical
system or without weight equalization!
The remaining risk is in this case, if two errors/faults occur simultaneously in the
power section; the motor briefly rotates (jolts) through a small angle (1FT mo-
tors: 4–pole 90°, 6–pole 60°, 8–pole 45°; induction motors: in the vicinity of the
remanence, max. 1 slot pitch, which corresponds to approximately 5° and
15°).1FN linear motors can, under fault conditions, continue to move through
180° electrical (approx. 56 or 72 mm incl. overshoot).
The start inhibit function does not provide electrical isolation. It does not provide
protection against ”electric shock”.
The complete machine or system must always be electrically isolated from the
line supply through the main disconnection device (main switch) before any
work is carried out on the machine or system, e.g. maintenance, service or clea-
ning work (refer to EN 60204–1; 5.3).
When correctly used, the start inhibit function must be looped in in the line con-
tactor circuit or EMERGENCY STOP circuit with the positively–driven signal
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 carried out accor-
ding to the Machinery Directive 89/392/EC and EN 292; EN 954; and EN 1050,
the machinery manufacturer must configure the safety circuit for the complete
machine taking into account all of the integrated components for his machine
types and versions of them. This also includes the electric drives.
9 Important Circuit Information
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