User manual

akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany Tel.: [phone] · www.akytec.de
5
5.1.1 Input
Fig. 5.5 Current sensor wiring
Fig. 5.6 Voltage sensor wiring
Table 5.1 Terminal assignment
Designation
Description
24VDC -
Power supply
24VDC +
DO-
Output -
DO+
Output +
COM
Common -
U+
Voltage input +
I+
Current input +
5.1.2 Output
The NPN transistor output is designed to control the low voltage relay up to 42 V DC / 200
mA
►
NOTICE
As a precaution against inadvertent current reversal on output, a parallel diode (U
VD
≥ 1.3U, I
VD
≥ 1.3I) is usually included in the output circuit.
Fig. 5.7 NPN transistor output
6 Operation
After the device is powered on the operating mode is activated. The type of the signal can be
selected in the parameter in.t “Input signal”. The complete list of the programming
parameters is shown in Table 7.2.
The input signal is digitalised, the square root calculated (if the function is enabled), the
signal scaled and displayed. The scale factor is calculated based on the parameter di.Lo
“Lower measuring limit” and di.Hi “Upper measuring limit”. The display decimal point can be
specified in the parameters di.P.
For other signal processing functions see sections 6.1…6.3. For displayed errors see Table
6.1.
6.1 Control
ON/OFF control is implemented with the NPN transistor output (see 5.1.2). The parameters
SP.Lo “Lower setpoint limit” and SP.Hi “Upper setpoint limit” specify the control limits. The
control function can be selected in the parameter Cnt:
− Heating
− Cooling
− Alarm within limits
− Alarm outside limits
DO-
K
_
U
U
+
VD
DO+