11
LH 5946 / 130910 / 363
Failure indication with flash code of LED „ERR“
The flash codes indicate failures caused externally (see diagram flashing
codes for failure indication on page 9).
A series of flash pulses 1-5 followed by a slightly longer space is displayed.
The flash code indicates the type of failure. If several failures are present at
the same time only the failure with the highest priority (lowest flash code) is
shown. When this failure is removed the other existing failures are displayed
in the same way according to their priority.
Failure storing / reset (terminals X2-X3)
With the external failures broken wire/offset and feedback circuit the operator
can choose between manual and automatic reset after the failure is removed.
X2-X3 open:
manual reset
X2-X3 closed:
automatic reset
Attention
The a.m. storing function of the external failures broken wire /offset,
and feedback circuit is not a safety function. I.e. in respect to safety
aspects it can not be regarded as guaranteed. The reset for these failures
must be therefore regarded as auto reset after removing the faults.
Internal device failures that could occur in seldom cases (e.g. caused
by temporary interference) can be reset by switching the supply volta-
ge off and on. If a reset is not possible also if the voltage is applied
correctly, the device could be defective and should be sent back to
the manufacturer for examination or repair.
Function
The LH 5946 has to be connected according to connection examples or in
a similar way. The connection of DC- motors is made as with single phase
AC-motors.
L1 - L2 - L3
The measuring wires L1-L2-L3 have to be connected directly to the win-
dings of the monitored motor (not via transformers) in order to provide a
correct broken wire detection for the connection wires and motor windings.
The motor windings must not be disconnected from the measuring wires by
motor contactors, because broken wire detection is activated and standstill
monitoring is disabled.
Interference to the measuring wires should be avoided as no standstill may
be detected by the LH 5946. If possible the measuring wires should be run
separately from the motor wires or screened wires should be used. In this
case the screen can be connected at the motor side.
A1 - A2
Connection of the auxiliary supply, recommended fuse : 2A.
A3+ / A4
DC 24 V supply (12 … 30 V) for the semiconductor monitoring outputs „ON“
and „ERR“, if these are used.
11-12, 23-24, 33-34, 43-44
Safety output contacts, connection according to the connection examples
or similar.
Recommended fuse: 5 A fast acting, to avoid welding of the contacts in
the case of external wiring or component failures. See also technical data.
Connection of LH 5946
Connection of LH 5946
53 - 54
Monitoring contact to indicate the state of the safety output (non safety contact)
X1 - X2 (feedback circuit)
Connection of NC contacts of external components or contactors for contact
re-enforcement, must be linked if not used.
X2 - X3
Connection for manual or auto reset, connection is made according to the
required application. When monitoring DC motors or in the case of DC-
braking the broken wire / offset failure will be shown during operation. In
this case the terminals must be linked because if storing the failure would
not allow activation of the safety contacts at standstill.
Attention
The terminals X1-X2-X3 have electrical connections to the measuring
inputs L1-L2-L3. Volt free contacts must be used for bridging. If termi-
nal X3 should be controlled by a PLC via an interface relay this must
have the necessary insulation between the motor voltage (measuring
input) and PLC potential.
