LD25x
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 be 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 be 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 be 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 basic set-up menu, the inputs can be 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 be aware that
open NPN inputs will
always represent a logical HIGH state. Consequently, Input C has to be
connected to GND externally to allow normal operation. If unconnected,
the unit would be kept in a continuous Reset state. In model LD253, also
Input A must be 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.
MAN LD25x E 1.0.odt
Electrical connections
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