Nord Drivesystems SK 510P - Details of the Safe Shut-Down Method; Wiring and Shielding; Operation with OSSD

Functional Safety – Supplementary manual for series SK 500P
32 BU 0630 en-2020
Plug-in interface SK CU5-STO or SK CU5-MLT
The STO function is implemented with dual channels. For a single channel version the inputs
VIS1_24V and VIS2_24V must be connected in parallel.
For the SS1-t function, the Quick Stop function must be triggered via the Safety Digital Input. Only the
digital input VISD_24V with terminal number 94 must be used for this. The function is set via the
Safety Digital Input parameter (P424).
Connection X20 Designation No. Description
Top view
VIS2_24V
92
24 V STO input 2 (SI2)
VIS12_0V
93
Reference potential for STO inputs(SI1/2)
VISD_24V
94
Safety Digital Input
Bottom view
VIS12_0V
93
Reference potential for STO inputs(SI1/2)
VIS1_24V
91
24 V STO input 1 (SI1)
VISD_0V 95 Reference potential for the Safety Digital Input
Connection terminals:
Push-in, wire stripping length 10 mm
Connection cross-
section:
0.2 … 1.5 mm
2
, AWG 24 … 16, rigid
0.25 … 1.5 mm
2
, AWG 24 … 16, flexible with wire end sleeve
Cross-section
Wire end sleeve length without
insulating collar according to
DIN 46228-1
Wire end sleeve length with
insulating collar according to
DIN 46228-4
0.25 mm²
5 mm … 7 mm
8 mm … 10 mm
0.34 mm²
7 mm
8 mm … 10 mm
0.05 mm²
8 mm … 10 mm
8 mm … 10 mm
0.75 mm²
8 mm … 10 mm
8 mm … 10 mm
1.00 mm²
8 mm … 10 mm
-
1.50 mm²
10 mm
-
Two wires with the same cross section are not possible.
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3.3 Details of the safe shut-down method
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3.3.1 Wiring and shielding
It is recommended to use a two-wire shielded cable for the on-board variant (SK 510P; SK 540P) of
the Safe Pulse Block. For the plug-in variant (SK CU5-STO; SK CU5) of the Safe Pulse Block and the
Safety Digital Input, a shielded cable is recommended (see 2.4.5 "Exclusion of wiring faults"). The
shield must be connected on both sides. The voltage drop in the cable must be taken into
consideration.
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3.3.2 Operation with OSSD
OSSD outputs (Output Signal Switching Device) are outputs which perform a self-test with the aid of
test pulses. Depending on the state of the output, these are switched on or off cyclically during a short
time window. The voltage level from the output is read back and checked as to whether the output
follows the expected change of voltage level. The inputs must not interpret the test pulses as changes
of state.