Nord Drivesystems SK 510P - 2.6 Encoder Connections

7 Additional information
BU 0630 en-2020 51
7 Additional information
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7.1 Protective switching devices
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The safety switching device used for the intended purpose, as well as all additional components
required to implement a safety function, must fulfil the requirements of the special application in
accordance with the risk analysis.
The switching device outputs must fulfil the following basic conditions.
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7.1.1 Output voltage of safety devices
The stated voltage must be connected to the input terminals of the frequency inverter. I.e. the voltage
drop in the used cable must be taken into account.
• Mechanical protective switching device
24 V ± 25% (18 V…30 V)
• Electronic protective switching device with OSSD outputs
24 V - 20%/ + 25% (19.2 V…30 V)
for the Safe Pulse Block
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7.1.2 Switching capacity and current load
The safety outputs of the switching devices must be designed for the loads stated below.
Load per connected frequency
inverter
SK 510P, SK 540P SK CU5-STO, SK CU5-MLT
VIS_24V (91) VIS1_24V (91) VIS2_24V (92)
Continuous current (average value)
See below
See below
See below
Switch-on current
≤ 700 mA for t ≤ 2.5 ms
≤ 70 mA for t ≤ 4 ms
≤ 700 mA for t
≤ 2.5 ms
Support capacitance (downstream of
inverse polarity protection)
approx. 30 μF
approx. 5 μF
approx. 30 μF
Peak current after an OSSD test
pulse (periodic)
≤ 700 mA for t ≤ 1 ms
≤ 70 mA for t ≤ 1 ms
≤ 700 mA for t ≤ 1 ms
The following details for average input currents relate to the voltage directly at the input terminals. I.e.
if necessary, the voltage drops in the cable and the tolerance of the source must be taken into
consideration. The stated currents are not typical values but rather form the basis for dimensioning the
protective switching device.