Safety Notes For The Sto Function In The Compax3M; Conditions Of Utilization For The Sto Function With Compax3M - Parker Compax3 Operating Instructions Manual

Parker EME
3.10.3.2

Safety notes for the STO function in the Compax3M

It should be noted in connection with the STO application examples illustrated

here that after the Emergency stop 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
voltages may still be present in the Compax3 drive for about 10 minutes.
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 an error in the drive system occurs during the active
braking phase, the axis may trundle to an unguided stop or might even actively
accelerate until the expiry of the defined switch-off time.
For synchronous motors operated in the field weakening range, the operation of

the STO function may lead to over speed and destructive, life-threatening over
voltages as well as explosions in the servo drive. 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
braking ramp. For example, this is true when the set-up window of the C3
ServoManager is used. If set-up mode is turned on or with the input simulator, the
digital I/O interface and fieldbus interface are automatically disabled.
Maintenance
When using the S1 option, a protocol describing the orderly working of the safety
function must be made upon the setup and in defined maintenance intervals (see
protocol proposal).
3.10.3.3 Conditions of utilization for the STO function with
Compax3M
The STO safety function must be tested and protocoled as described (see on

page 94). 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
assume that the safety doors will be opened several times during the operation of
the machine.
The Compax3M with integrated STO safety function as well as the utilized safety

switching devices must be mounted protected (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 PSUPxx mains module must be connected

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)!
When using an external safety switching device 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 applying a
lead seal). With the UE410-MU3T5 safety switching device, this is not necessary,
if the anti manipulation measures are respected.
The adjustable delay time on the safety switching device must be set to a value

greater than the duration of the braking ramp controlled by the Compax3 with
maximum load and maximum speed.
All conditions necessary for CE-conform operation must be observed.

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.
When using synchronous motors, a short movement over a small angle is

possible, if two errors 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).
192-120113 N08 C3I12T11 - December 2010
Compax3 device description
89