NORDAC PRO (SK 500P) – Users Manual for Frequency Inverters
46 BU 0600 en-2319
Response time of digital inputs
The response time of a digital signal is approx. 4 – 5 ms and consists of the following:
Internal processing <
1 ms
A parallel channel exists for digital inputs DIN2 and DIN3, which relays the signal pulses between
250 Hz and 150 kHz directly to the processor, and therefore makes it possible for an encoder to be
evaluated.
Cable laying
All control cables (including thermistors) must be routed separately from the mains and the motor
cables to prevent interference in the device.
If the cables are routed in parallel, a minimum distance of 20 cm must be maintained from cables
which carry a voltage of > 60 V. The minimum distance may be reduced by screening the cables
which carry a voltage, or by the use of earthed metal partitions within the cable conduits.
Alternatively: Use a hybrid cable with shielding of the control lines.
Description / Technical data
Terminal Parameter
Function of factory setting
(SK 530P and higher)
Monitoring of motor temperature using PTC
If the device is installed near the motor, a
shielded cable must be used.
EN 60947-8
On: > 3.6 kΩ
Off: < 1.65 kΩ
Measurement voltage 5 V on R < 4 kΩ
The input is always active. In order to make the device
operational, a temperature sensor must be connected or both
contacts must be connected with jumpers.
TF+ PTC resistor input - -
230 VAC, 24 VDC, < 60 VDC in circuits with safe isolation, ≤ 2 A
Test multi-function relay 1 P434 [-01]
External brake (applied on
enabling)
2 K1.2
Test multi-function relay 2 P434 [-02]
Fault (closes when FI ready / no
fault)
K2.2
Control voltage
connection X6
(SK 530P and higher)
Supply voltage for the device
24 V … 30 V, min. 1000 mA, depending on the load on inputs and outputs and use of options
Voltage input, connection
optional. If no control voltage is
available, the control voltage
can be supplied via an internal
mains unit.
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