Safety
WARNING
2
2
RISK OF ELECTRICAL SHOCK
The STO function does NOT isolate AC line voltage to the
adjustable frequency drive or auxiliary circuits. Perform
work on electrical parts of the adjustable frequency drive
or the motor only after isolating the AC line voltage
supply and waiting the length of time specified in the
Safety chapter in the relevant Instruction Manual. Failure
to isolate the AC line voltage supply from the unit and
waiting the time specified could result in death or
serious injury.
•
Do not stop the adjustable frequency drive by
using the STO function. If a running adjustable
frequency drive is stopped by using the function,
the unit trips and stops by coasting. If this is not
acceptable, i.e., causes danger, stop the
adjustable frequency drive and machinery by
using the appropriate stopping mode before
using this function. Depending on the
application, a mechanical brake may be required.
•
STO is suitable for performing mechanical work
on the adjustable frequency drive system or
affected area of a machine only. It does not
provide electrical safety. STO should not be used
as a control for starting and/or stopping the
adjustable frequency drive.
CAUTION
Automatic restart behavior is only allowed in one of the
two situations:
•
The unintended restart prevention is
implemented by other parts of the STO instal-
lation.
•
A presence in the dangerous zone can be
physically excluded when STO is not activated.
In particular, paragraph 6.3.3.2.5 of ISO 12100:
2010 must be observed.
6
Instruction Manual
RISK OF DEATH AND SERIOUS INJURY
The STO function can be used for asynchronous,
synchronous and permanent magnet motors. Two faults
can occur in the power semiconductor of the adjustable
frequency drive. When using synchronous or permanent
magnet motors, a residual rotation can result from the
faults. The rotation can be calculated to angle = 360/
(number of poles). The application using synchronous or
permanent magnet motors must take this residual
rotation into consideration and ensure that it does not
pose a safety risk. This situation is not relevant for
asynchronous motors.
NOTICE!
The selection of a stop category in accordance with EN
60204-1 for each stop function must be determined by a
risk assessment:
•
•
•
NOTICE!
When designing the machine application, timing and
distance should be considered for a coast to stop (Stop
Category 0 or STO). For more information regarding stop
categories, refer to EN 60204-1.
Danfoss A/S © 09/2014 All rights reserved.
WARNING
Stop Category 0 is achieved with immediate
removal of power to the servo, resulting in an
uncontrolled coast to stop. STO according to EN
61800-5-2 accomplishes a Stop Category 0 stop.
Stop Category 1 is achieved with power
available to the machine servos to achieve the
stop. Power is removed from the servos when
the stop is achieved according to EN 61800-5-2
Safe Stop 1 (SS1).
Stop Category 2 is a controlled stop with power
available to the machine servos. The stop is
followed by a holding position under power.
MG37D222
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