selection [4] PTC 1 Alarm or [5] PTC 1 Warning is chosen by
mistake and the external safety device triggers Safe Stop
then the frequency converter issues an alarm ”Dangerous
Failure [A72]” and coast the frequency converter safely,
without Automatic Restart.
Selections [6] PTC 1 & Relay A to [9] PTC 1 & Relay W/A must
be chosen for the combination of external safety device
and MCB 112.
NOTE
Note that selections [7] PTC 1 & Relay W and [8] PTC 1 &
Relay A/W open up for Automatic restart when the external
safety device is de-activated again.
This is only allowed in the following cases:
1. The unintended restart prevention is
implemented by other parts of the Safe Stop
installation.
2. A presence in the dangerous zone can be
physically excluded when Safe Stop is not
activated. In particular, paragraph 5.3.2.5 of ISO
12100-2 2003 must be observed.
See 9.8 MCB 112 PTC Thermistor Card and the operating
instructions for the MCB 112 for further information.
3.12.3
Safe Stop Commissioning Test
After installation and before first operation, perform a
commissioning test of an installation or application making
use of Safe Stop.
Moreover, perform the test after each modification of the
installation or application, which the Safe Stop is part of.
NOTE
A passed commissioning test is mandatory after first instal-
lation and after each change to the safety installation.
The commissioning test (select one of cases 1 or 2 as
applicable):
Case 1: restart prevention for Safe Stop is required (i.e.
Safe Stop only where 5-19 Terminal 37 Safe Stop is set to
default value [1], or combined Safe Stop and MCB112
where 5-19 Terminal 37 Safe Stop is set to [6] or [9]):
1.1 Remove the 24 V DC voltage supply to
terminal 37 by the interrupt device while the
motor is driven by the FC 302 (i.e. mains supply is
not interrupted). The test step is passed if the
motor reacts with a coast and the mechanical
brake (if connected) is activated, and if an LCP is
mounted, the alarm “Safe Stop [A68]” is
displayed.
1.2 Send Reset signal (via Bus, Digital I/O, or
[Reset] key). The test step is passed if the motor
remains in the Safe Stop state, and the
mechanical brake (if connected) remains
activated.
1.3 Reapply 24 V DC to terminal 37. The test step
is passed if the motor remains in the coasted
state, and the mechanical brake (if connected)
remains activated.
1.4 Send Reset signal (via Bus, Digital I/O, or
[Reset] key). The test step is passed if the motor
becomes operational again.
The commissioning test is passed if all four test steps 1.1,
1.2, 1.3 and 1.4 are passed.
Case 2: Automatic Restart of Safe Stop is wanted and
allowed (i.e. Safe Stop only where 5-19 Terminal 37 Safe
Stop is set to [3], or combined Safe Stop and MCB112
where 5-19 Terminal 37 Safe Stop is set to [7] or [8]):
2.1 Remove the 24 V DC voltage supply to
terminal 37 by the interrupt device while the
motor is driven by the FC 302 (i.e. mains supply is
not interrupted). The test step is passed if the
motor reacts with a coast and the mechanical
brake (if connected) is activated, and if an LCP is
mounted, the warning “Safe Stop [W68]” is
displayed.
2.2 Reapply 24 V DC to terminal 37.
The test step is passed if the motor becomes operational
again. The commissioning test is passed if all two test
steps 2.1 and 2.2 are passed.
NOTE
See warning on the restart behaviour in 3.12.1 Terminal 37
Safe Stop Function
Introduction
VLT
®
AutomationDrive FC 300 Design Guide, 0.25-75 kW
58 MG33BE02 - VLT
®
is a registered Danfoss trademark
3
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