Safety Notes And Limitations Of The Sto Function In The Compax3M - Parker Compax3 Series Operating Instructions Manual

Parker EME
3.11.2.2 Safety notes and limitations of the STO function in the
Compax3M
The STO safety function must be tested and protocoled as described (see page
98). The safety function must be requested at least once a week. In safety door
applications, the weekly testing interval must not be observed, as you can assu-
me that the safety doors will be opened several times during the operation of the
machine.
The CompaxeM with integrated STO safety function as well as the utilized safety
control devices must be mounted protectedly (IP54 control cabinet).
Only qualified staff members are permitted to install the STO function and place it
in service.
The X9/2 (GND24V) terminal on the Compax3MPxx mains module must be con-
nected to the PE protective lead. This is the only way to ensure protection against
incorrect operation through earth faults (EN60204-1 Section 9.4.3)!
All conditions necessary for CE conform operation (see page 16) must be ob-
served.
It should be noted in connection with the STO application examples illustrated
here that after the Emergency Power-off switch has been activated, no galvanic
isolation in accordance with EN 60204-1 Section 5.5 is guaranteed. This means
that the entire system must be disconnected from the mains power supply with an
additional main switch or mains power contactor for repair jobs. Please note in
this regard that even after the power is disconnected, dangerous electrical volta-
ges may still be present in the Compax3 drive for about 5 minutes.
When using an external Emergency power-off module with adjustable delay time,
(as illustrated in the STO application example), it must be ensured that the delay
time cannot be adjusted by persons not authorized to do so (for example by ap-
plying a lead seal). With the UE410-MU3T5 safety control, this is not necessary, if
the anti manipulation measures are respected.
The adjustable delay time on the Emergency Power-off module must be set to a
value greater than the duration of the braking ramp controlled by the Compax3
with maximum load and maximum speed.
If there are external forces operating on the drive axes, additional measures are
required (for example additional brakes). Please note in particular the effects of
gravity on suspended loads! This must be respected above all for vertical axes
without self-locking mechanical devices or weight balance.
During the active braking phase of Stop category 1 (controlled bringing to a stop
with safely monitored delay time according to EN60204-1) or safe stop 1, faulty
function must be expected. If a fault in the drive system occurs during the active
braking phase, the axis may trundle to a stop unguidedly or might even actively
accelerate until the expiry of the defined switch-off time.
When using synchronous motors, a short movement over a small angle is possi-
ble, if two faults occur simultaneously in the power section. This depends on the
number of pole pairs of the motor (rotary types: 2 poles = 180°, 4 poles = 90°, 6
poles = 60°, 8 poles = 45 °, Linear motors: 180° electrically).
For synchronous motors operated in the field weakening range, the operation of
the STO function may lead to overspeed and destructive, life-threatening overvol-
tages as well as explosions in the servo controller. Therefore, NEVER use the
STO function with synchronous drives in the field-weakening range.
It is important to note that if the drive is being activated (Energize) by the USB /
RS485 interface, it may not be possible to execute switch-off by a controlled bra-
king ramp. For example, this is true when the set-up window of the C3 ServoMa-
nager is used. If set-up mode is turned on or with the imput simulator, the digital
I/O interface and fieldbus interface are automatically disabled.
192-120114 N5 C3I22T11 June 2008
Compax3 device description
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