8
LH 5946 / 130910 / 363
Operating instructions
EnGLISH
Before installing, operating or maintaining this device, these instructions
must be carefully read and understood.
DAnGER
CAUTIOn
Dangerous voltage.
Electric shock will result in death or serious injury.
Disconnect all power supplies before servicing equipment.
Safe operation of the device is only guaranteed when using certified
components!
Important notes
The product hereby described was developed to perform safety functions
as a part of a whole installation or machine. A complete safety system
normally includes sensors, evaluation units, signals and logical modules
for safe disconnections. The manufacturer of the installation or machine
is responsible for ensuring proper functioning of the whole system. DOLD
cannot guarantee all the specifications of an installation or machine that
was not designed by DOLD. The total concept of the control system into
which the device is integrated must be validated by the user. DOLD also
takes over no liability for recommendations which are given or implied in
the following description. The following description implies no modification
of the general DOLD terms of delivery, warranty or liability claims.
Safety Regulations
- This device must be installed and operated by trained staff who are
familiar with these instructions and with the current regulations for safety
at work and accident prevention.
- Pay attention to applicable local regulations, especially regarding safety
measures.
- The shock protection on the connected elements and the cable insulation
must be designed for the highest voltage applied to the device.
- Opening the device or implementing unauthorized changes voids any
warranty
- The unit should be panel mounted in an enclosure rated at IP 54 or
superior. Dust and dampness may lead to malfunction.
- Adequate fuse protection must be provided on all output contacts with
capacitive and inductive loads.
- In addition a fuse must be provided to protect the contacts against
welding (see technical data).
The LH 5946 is used for standstill detection on motors without sensors.
•
Standstill detection in safety circuits according to IEC/EN 60204 in
machines with dangerous parts or tools to enable protection systems.
•
To avoid damage if unexpected start can cause collision.
•
Motor control when reversing direction.
When used in accordance with its intended purpose and following these
operating instructions, this device presents no known residual risks. Non-
observance may lead to personal injuries and damages to property.
Designated use
Practical notes
The Standstill monitor LH 5946 is suitable to monitor the standstill of all
electric motors that generate a remanence voltage while coasting to stop.
The LH 5946 is connected to the motor terminals and measures the induced
back emf voltage. 2 redundant measuring channels are used (L2-L1 and
L3 L1). If the back emf voltage drops to 0 simultaneously in both channels
this indicates standstill and the output relay is energized.
To adopt the unit to all different types of motors and applications the
voltage threshold indicating standstill on LH 5946 is adjustable. Also the
time delay between detection and energisation of the relay is adjustable
(standstill time ts).
In addition the unit detects broken wire on the measuring inputs
L1 / L2 / L3. If broken wire is detected the output relays goes into safe state
(as with running motor). This state is stored and can be reset by bridging
terminals X3-X2.
The input signals of both channels are permanently compared. If the signals
are different for more then 2.5 sec a simultaneity failure is detected. This
failure resets when both input channels receive simultaneous signals with
a level, above the voltage threshold and hysteresis.
To the terminals X1-X2 the feedback circuit of external contactors (used
for contact reinforcement) is connected (NC contact). If no feedback circuit
is required, these terminals must be linked. Open terminals will cause a
failure message.
Safety notes
0265697
•
It is the liability of the builder of the plant or machine to guarantee the
complete safety function by selecting the correct components, wiring and
operation.
Also the correct tripping point U
an
and time delay setting t
s
of LH 5946
suitable for the application is in the liability of the user and has to be
determined by testing the system under worst case conditions.
If e.g. the motor current is run down slowly using a frequency inverter
or a softstop unit, a de-magnetisation of the motor can take place. It is
necessary to check if the remaining remanence voltage is sufficient to
guarantee a correct and safe standstill monitoring. At high frequencies
an increasing damping of the measuring inputs has to be taken into
account (see page 13, technical data Measuring input „response value
dependant on frequency“).
ATTEnTIOn !
The terminals X1 - X2 - X3 has no galvanic separation to the
measuring ciruit L1 - L2 - L3. They must be controlled with volt free contacts.
SAFEmASTER S
Standstill monitor
LH 5946
ORIGInAL
All technical data in this list relate to the state at the moment of edition. We reserve the right for
technical improvements and changes at any time.
