Pepperl+Fuchs KCT1-6SR-C Mode D'emploi page 16

1.7 Advice on noise immunity
All connections are protected against external sources of
interference. The installation location should be chosen so
that inductive or capacitive interference does not affect the
device or its connecting lines! Interference (e.g. from
switch-mode power supplies, motors, clocked controllers or
contactors) can be reduced by means of appropriate cable
routing and wiring.
1.8 Measures to be taken:
– Use only shielded cable for signal and control lines.
– Connect cable shield at both ends.
– The conductor cross-section of the cables should be a
minimum of 0.14 mm².
– The shield connection to the equipotential bonding should
be as short as possible and with a contact area as large
as possible (low-impedance).
– Only connect the shields to the control panel, if the latter
is also earthed.
– In case of problems due to ground loops, the shield is to
be connected to the reference ground, on the reception
side, with low impedance and, on the emission side, via a
capacitor of approximately 100nF.
– Install the device as far away as possible from noise-con-
taining cables.
– Avoid routing signal or control cables parallel to power
lines.
– Cables and their insulation should be in accordance with
the intended temperature, voltage and power ranges. The
standards of the respective countries apply.
1.9 Start-up
The following points must be checked before starting up the
device:
1. Does the available supply voltage match the supply vol-
tage of the device?
2. Is the supply voltage connected to the good terminals of
the device?
3. For DC-powered devices, does the supply voltage re-
spect the polarity?
4. Is the device set and programmed correctly (function; for
counters, max. counting frequency)?
1.10 Failure possibilities and causes
No display:
- No power supply.
mpossible to use the keys:
- Key lock input activated
Counter does not count:
- Wrong or reversed wiring of the counting input
- Setting of an input signal not matching the pulse genera-
tor
- Polarity (NPN/PNP) reversed
- Gate input active
- No ground connection between the pulse generator and
the counter
- Maximum counting frequency exceeded
- Signal levels do not reach the switching threshold of the
counter
- Factor too small
Output signal missing:
- Wrong output connection
- No ground connection with the following device
Zumutbare Änderungen aufgrund technischer Verbesserungen vorbehalten.
16
Pepperl+Fuchs GmbH 68301 Mannheim Telefon (0621)776-11 11 Telefax (0621)776-27-11 11 Internet http://www.pepperl-fuchs.com
Relay output signal missing:
- Output contacts short-circuited
- Output signal (fugitive signal duration) programmed too
short
- Relay contact defective due to too high load
- Relay current below min. value
If, despite all, your device still does not operate, contact
your local representative or call us directly for technical
support.
When sending your device back, please attach a short des-
cription of the failure, of the programming and of the con-
nection diagram, in order to allow us to reproduce a
possibly existing defect and to repair your device as quickly
as possible.
2. Inputs
2.1 INP A, INP B
Counting inputs. Their function depends on the selected
input mode. The maximum counting frequency of 20 kHz
can be reduced to 30 Hz by programming.
2.2 GATE
Static gate input. Function depending on the programmed
operating mode.
Pulse counter mode:
No counting if the input is ON.
Time counter mode:
Counting programmable for input ON (gate.lo) or OFF
(gate.hi). The decimal point of the lowest decade blinks to
indicate that the counting is running.
2.3 RESET
Dynamic reset input. Resets the counter to zero when
counting up, and sets it to the preselected value when
counting down. The reset input can be inhibited in the
Setup.
2.4 KEY
Static key locking input. The presets cannot be modified as
long as this input is ON. It is however still possible to switch
the display between the counting value and the presets.
3. Output
Potential-free change-over relay or optocoupler with open
emitter and collector.
Active output
The active output is indicated by a status LED. The output
can be reversed in case of safety circuits, i. e. voltage to the
relay coils is cut off or the optocoupler block when the pre-
set values are reached.
Caution:
In all modes with automatic repetition (AddAr, SubAr) the
duration of the pulse is to be programmed for the timed si-
gnal of the output, otherwise this signal will have no defined
duration.
Copyright Pepperl+Fuchs, Printed in Germany