Lika LD25 Series User manual

LD25x
User's manual
LD250 – LD251 – LD252 - LD253
Description
LD25x is a SSI display for connecting single-turn or multi-turn SSI encoders. The
user's interface is a multi-function key oard fitted with 3 keys and a 7-segment
and 6-digit LED display.
Model LD250 is a SSI display only version; model LD251 provides an analogue
output in addition; model LD252 further offers two presets and two switching
outputs; finally model LD253 is equipped with a RS-232/RS-485 serial interface
for connection with a PC.
Table of contents
1 - Safety summary
2 - Identification
3 - Mounting instructions
4 - Electrical connections
5 - Operating the front keys
6 - Operator menu
7 - Set-up procedure
8 - Hints for application
9 - Special functions
10 - Parameters list
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1 Safety summary
1 1 Safety
•Always adhere to the professional safety and accident prevention
regulations applica le to your country during device installation and
operation;
•installation and maintenance operations have to e carried out y qualified
personnel only, with power supply disconnected and stationary mechanical
parts;
•device must e used only for the purpose appropriate to its design: use for
purposes other than those for which it has een designed could result in
serious personal and/or the environment damage;
•high current, voltage and moving mechanical parts can cause serious or
fatal injury;
•warning ! Do not use in explosive or flamma le areas;
•failure to comply with these precautions or with specific warnings
elsewhere in this manual violates safety standards of design, manufacture,
and intended use of the equipment;
•Lika Electronic s.r.l. assumes no lia ility for the customer's failure to comply
with these requirements.
1 2 Electrical safety
•Turn OFF power supply efore connecting the device;
•connect according to explanation in section ”4 - Electrical connections”;
•in compliance with 2004/108/EC norm on electromagnetic
compati ility, following precautions must e taken:
- efore handling and installing the equipment, discharge
electrical charge from your ody and tools which may come in touch with
the device;
- power supply must e sta ilized without noise; install EMC filters on
device power supply if needed;
- always use shielded ca les (twisted pair ca les whenever possi le);
- avoid ca les runs longer than necessary;
- avoid running the signal ca le near high voltage power ca les;
- mount the device as far as possi le from any capacitive or inductive noise
source; shield the device from noise source if needed;
- minimize noise y connecting the unit to ground (GND). Make sure that
ground (GND) is not affected y noise. The connection point to ground can
e situated oth on the device side and on user’s side. The est solution to
minimize the interference must e carried out y the user.
1 3 Mechanical safety
•Install the device following strictly the information in the section “3 -
Mounting instructions”;
•do not disassem le the unit;
•do not tool the unit;
•delicate electronic equipment: handle with care; do not su ject the device
and the shaft to knocks or shocks;
•respect the environmental characteristics of the device.
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2 Identification
Device can e identified through the ordering code and the serial number
printed on the la el applied to its ody. Information is listed in the delivery
document too. Please always quote the ordering code and the serial num er
when reaching Lika Electronic s.r.l. for purchasing spare parts or needing
assistance. For any information on the technical characteristics of the product,
refer to the technical catalogue.
3 Mounting instructions
WARNING
Mount the unit with power supply disconnected.
Mount the display into the provided cut-out (approx. 91 x 44 mm) without
panel clips.
Install panel clips on the display housing and screw until fixed.
96,0 (3.780’’)
110,0 (4.331’’)
44,0 (1.732)
10,0
(.394)
8,0
(.315)
91,0 (3.583)
9,0 (.345) 129,0 (5.079)
140,5 (5.531)
48,0 (1.890)
Panel cut out: 91 x 44 mm (3 583 x 1 732’’)
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4 Electrical connections
WARNING
Turn OFF the power supply efore connecting the device.
LD250
Display unit only
All connections are as
shown elow, except for
terminals 8, 9 and 10 which
are not connected.
LD251
Display unit with
analogue output
GND 17-30 VCD IN
1 2 3 4 5 6 7 8 9 10
Input A Input B GND +24 VDC OT
GND analogue
+/- 10 V analogue
0/4-20 mA analogue
PE
GND 230VAC 115 VAC 0 VAC
CLK CLK DAT DAT
1 2 3 4
Input C (Reset)
LD252
Display unit with 2
presets and transistor
outputs
GND 17-30 VCD IN
1 2 3 4 5 6 7 8 9 10
Input A Input B Input C (Reset) GND +24 VDC OT
COM+ OT 1 OT 2
PE
GND 230VAC 115 VAC 0 VAC
CLK CLK DAT DAT
1 2 3 4
LD253
Display unit with serial
interface
GND
17-30 VCD IN
1 2 3 4 5 6 7 8 9 10
Input A (transm.)
Input B Input C (Reset) GND +24 VDC OT
TxD / B (-)
PE
GND 230VAC 115 VAC 0 VAC
CLK CLK DAT DAT
1 2 3 4
GND
RxD / A (+)
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4 1 Power supply
The unit accepts DC power supply from 17 V to 30 V when using terminals 1
and 2. The consumption depends on the level of the supply voltage (typically
130mA at 30V or 190mA at 17V, plus current taken from aux. output).
For AC supply the terminals 0 VAC, 115 VAC or 230 VAC can e used. The total
AC power is 7.5 VA.
The pictures in the previous page show a dotted line for grounding to PE. This
connection is not really necessary, neither for safety nor for EMC. However, for
specific applications, it may e useful to ground the common potential of all
signal lines.
NOTE
When using this earthing option, please note that:
1. all terminals and potentials marked “GND“ will e earthed;
2. you should avoid multiple earthing, e.g. when you use a DC power
supply where the Minus is already connected to earth etc.
4 2 Auxiliary voltage output
Terminal 7 provides a 24 VDC / 120 mA max. auxiliary output for supply of
sensors and encoders.
4 3 Control inputs A, B and C
In LD253 model input A is used to activate a serial transmission (rising edge, see
section “7.5.2 Printer-Mode” on page 26). Input B is not used.
Input C operates as a Set / Reset input (static function, active "HIGH", see
section “8.3 Scaling of the display” on page 29).
In the asic set-up menu, the inputs can e configured to PNP (signal must
switch to +) or to NPN (signal must switch to -). This configuration is valid for
all three inputs at the same time.
The factory setting is always PNP.
NOTE
1. When NPN setting is used, please e aware that open NPN inputs will
always represent a logical HIGH state. Consequently, Input C has to e
connected to GND externally to allow normal operation. If unconnected,
the unit would e kept in a continuous Reset state. In model LD253, also
Input A must e connected to GND and opening this connection will
generate a rising edge to start a serial transmission.
2. When you use 2-wire NAMUR type sensors, please select NPN, connect
the negative wire of the sensor to GND and the positive wire to the
corresponding input.
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Typical input circuit of control input:
PNP
4,7k
GND GND
+24V int.
Input
4,7k
GND
Input
+24V int.
NPN
The minimum pulse duration on the Reset input (C) must e 5 msec.
4 4 Adjustable analogue output (LD251 model only)
A voltage output is availa le, operating in a range of 0 ... +10 V or –10 V ... +10
V according to setting. At the same time, a current output 0/4 – 20 mA is
availa le. Both outputs refer to the GND potential and the polarity changes with
the sign in the display. The outputs are proportional to the display value and
provide a 14- it resolution.
The maximum current for the voltage output is 2 mA and the load on the
current output can vary etween 0 and max. 300 ohms.
The response time of the analogue output at each change of the encoder
position is approx. 7 msec.
4 5 Optocoupler (transistor) outputs (LD252 model only)
Outputs provide programma le switching characteristics and are potential-free.
Please connect terminal 8 (COM+) to the positive potential of the voltage you
want to switch (range 5V....35V). You must not exceed the maximum output
current of 150 mA. If you switch inductive loads, please provide filtering of the
coil y means of an external diode.
The optocoupler outputs provide a response time of approx. 5 msec with
resistive load.
Opto Opto 33 R
(8)
(9)
(10)
Com+ (5 ... 35 V)
Output 1 (max. 150 mA)
Output 2 (max. 150 mA)
33 R
Preset 2 Preset 1
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4 6 Serial RS-232 / RS-485 interface (LD253 model only)
Ex factory the unit is set to RS-232 communication. This setting can e changed
to RS-485 (2-wire) y means of an internal DIL switch. To access the DIL switch,
you must remove the screw terminal connectors and the ack panel. Then pull
the oard to the rear to remove the PCB from its housing.
ON DIP
DIL-S itch
Removal of the back panel Location of the DIL switch
RS-232
ON
8
9
10
RxD
TxD
GND
RS-485
ON
8
9
10
A (+)
B (-)
GND
WARNING
1. Never set DIL switch positions 1 and 2 or DIL switch positions 3 and 4 to
ON at the same time!
2. After setting the switch, shift the print carefully ack to its housing, in
order to avoid damaging the front pins for connection with the front
keypad plate.
Connection of the RS-232 interface
Connection of the RS-485 interface
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5 Operating the front keys
For set-up and other operations the unit is fitted with three front keys which
will e denominated as follows in the next pages:
ENTER
(Input)
SET
(Setting)
CMD
(Command)
The functions of the keys are depending on the actual operating state of the
unit.
The following three operating states apply:
•Normal display state (see section “5.1 Normal display state” on page 8)
•Set-up state (see section “5.2 Selection and setting of parameters” on
page 9)
- Basic set-up (see section “7.1 Basic settings” on page 14)
- Operational parameters set-up (see section “7.2 Operational
parameters” on page 16)
•Teach operation (see section “5.3 Teach operation” on page 10)
5 1 Normal display state
NOTE
You can only change over to other operation states while the unit is in the
normal display state.
Change over to Key operation
Basic set-up Keep ENTER and SET down simultaneously for 3 seconds
Operational
parameter set-up Keep ENTER down for 3 seconds
Teach operation Keep CMD down for 3 seconds
The CMD key is only used to execute the Teach procedure with linearisation. For
more details please refer to sections “9.1 Linearisation“ and “9.2 Manual input or
„teaching“ of the interpolation points” on page 35.
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5 2 Selection and setting of parameters
5 2 1 Selecting a parameter
The ENTER key will scroll through the menu. The SET key allows to select the
corresponding item and change the setting or the numeric value. After this, the
selection can e saved y pressing the ENTER key again, which automatically
changes over to the next menu item.
5 2 2 Changing parameter settings
With numerical entries, at first the lowest digit will link. When keeping the SET
key continuously down, the highlighted digit will scroll in a continuous loop
from 0 to 9 and again from 0 to 9; and so on. After releasing the SET key, the
actual value will remain and the next digit will e highlighted ( link). This
procedure allows setting all digits to the desired values. After the most
significant digit has een set, the low order digit will link again and you can
make corrections if necessary.
With signed parameters, the high order digit will scroll from “0” to "9" (positive)
followed y “-“ and "-1" (negative).
5 2 3 Saving settings
To save the actual setting, press the ENTER key, which will also automatically
scroll forward the menu.
NOTE
At any time the unit changes from programming mode to normal display
operation, when you keep the ENTER key down again for 3 seconds at least.
5 2 4 Time-out function
A “time-out” function will automatically terminate every menu level, when for a
reak period of 10 seconds no key has een pressed. In this case, all changes
which have not een confirmed y ENTER yet would remain unconsidered.
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5 3 Teach operation
NOTE
The time-out function remains disa led during all Teach operations.
Key Function
ENTER will terminate or a ort any Teach operation in
progress
SET function is fully similar to normal set-up operation
CMD will save the display value in the register and
change over to the next interpolation point
For further details on the Teach procedure see section “9.2 Manual input or
„teaching“ of the interpolation points” on page 37.
5 4 Setting all registers to “Default“ values
At any time you can return all settings to the factory default values.
WARNING
This action will reset all parameters to factory default values and your own
settings will e lost. You will have to repeat your individual set-up procedure.
Factory default values are shown in the su sequent parameter ta les (see
section “Parameters list” on page 39).
To reset the unit to default values:
•switch power off;
•press the ENTER key on the front;
•keep ENTER down while you power up again.
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