Functional safety with NORD SK 500E frequency inverters
36 BU 0530 GB-3712
Function
[factory setting]
Description / wiring suggestion
Digital input 1
[ON right]
7.5...30V, R
i
=6.1k
Not suitable for
thermistor evaluation.
HTL encoders can
only be connected to
DIN2 and DIN4
Limiting frequencies:
max. 10 kHz
min. 15 Hz
Each digital input has a reaction
time of ≤ 5ms.
Control with internal 15V:
21
22
23
24
39
38
42
40
motor - PTC
15V
Control with external 7.5-30V:
21
22
23
24
39
38
42
40
motor - PTC
GND / 0V
7.5 … 30V
Digital input 2
[ON left]
Digital input 3
[parameter set bit0]
Digital input 4
[Fixed frequency 1,
P429]
potential isolated
thermistor input, which
cannot be disabled,
for monitoring the
motor temperature
with a PTC
15V supply voltage
output
Supply voltage provided by the
frequency inverter for connection to
the digital inputs or the supply of a
10-30V encoder.
Reference potential
for digital signals
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