Nord Drivesystems SK 510P User manual

Getriebebau NORD GmbH & Co. KG
Getriebebau-Nord-Straße 1 • 22941 Bargteheide, Germany • www.nord.com
Technical Information / Datasheet STO/SS1
NORDAC PRO (SK 500P) TI 80_0030 V 1.0 3219 en
Functional Safety
To prevent danger to people and material it is necessary to be able to safely switch off machines. For
this, the frequency inverter provides the safety functions STO and SS1-t.
Safely torque switch-off: STO (Safe Torque Off)
With the STO function the drive torque is switched off as quickly as possible and the drive runs down
to a standstill. This behaviour corresponds to stop category 0 according to EN 60204-1. An undefined
time elapses before the drive unit does not carry out any further movement and a safe state is
achieved.
Safe Stop 1 with time control SS1-t (Safe Stop 1 time-controlled)
With the function SS1-t the motor is initially braked by the frequency inverter. After shut-down the STO
input must be externally switched to the STO function. This behaviour corresponds to stop category 1
(controlled braking) according to EN 60204-1.
Information
The safety functions STO/SS1-t are NOT certified and qualified, i.e. they have no warranted safety
characteristics and must only be used for test purposes. It is at the discretion of the user to ensure
adequate safety in the installations.
1 Validity of document
The following information applies for NORDAC PRO (SK 500P) series frequency inverters. The basic
and further information about the frequency inverters can be found in the following documents:
• BU 0530, Issue 1217 (Part. No.: 6075301): Functional safety, supplementary instructions for
SK 500E series
• BU 0600, Issue 2319 (Part. No.: 6076001): NORDAC PRO (SK 500P)

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2 Hardware description
The safety functions are available as options.
1. on board (SK 510P/SK 540P)
2. as plug-in interface SK CU5-STO (SK 530P and higher)
SK 510P SK CU5-STO
Figure 1: Hardware

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2.1 Electrical connection
2.1.1 On board (SK 510P/SK 540P)
Connection X19 Designation No. Description
24VOut 43 24 V voltage output
GND 40 Reference potential for 24 V output and SS1-t- input
VISD_24V
94
Digital input for controlled shut-down (SS1-t)
VIS_0V
93
Reference potential for STO input
VIS_24V
91
24 V STO input
The STO function is implemented as a single channel. Therefore the connection and wiring conditions
as described in BU0530 apply.
For the SS1-t function the function "Quick stop" must be triggered via the dedicated SS1-t input. Only
the digital input VISD_24V with terminal number 94 must be used for this. The function is set with
parameter P424.
2.1.2 SK CU5-STO plug-in interface
The STO function is implemented as two channels. For a single channel version the inputs VIS1_24V
and VIS2_24V must be connected in parallel. In this case the connection and wiring conditions as
described in BU0530 apply.
For the SS1-t function the function "Quick stop" must be triggered via the dedicated SS1-t input. Only
the digital input VISD_24V with terminal number 94 must be used for this. The function is set with
parameter P424.
Connection X20 Designation No. Description
top side
VIS2_24V
92
24 V STO input 2 (SI2)
VIS12_0V
93
Reference potential for STO inputs(SI1/2)
VISD_24V
94
Digital input for controlled shut-down (SS1-t)
bottom side
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 controlled shut-down (SS1-t)
Safe Pulse Block Switch
The switch-off of the 24 V supply via contacts VIS1_24V_SH and VIS2_24V must be carried out by a
fail-safe switching device. As the interface SK CU5-STO is implemented as two channels with 2 x 24 V
IN (terminals 91 and 92) and as there is only one common ground, the Low side (GND) must not be
switched.

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2.2 Installation of an SK CU5-STO customer unit
DANGER
Danger of electric shock
The frequency inverter has a hazardous voltage for up to 5 minutes after it has been switched off.
• Only carry out work when the frequency inverter has been disconnected and at least 5 minutes
have elapsed since the mains was switched off!
Installation must be carried out as follows:
1. Switch off the mains voltage, observe the waiting period.
2. Push the control terminal cover down or remove.
3. Remove the blank cover by activating the release mechanism at the lower edge and removing it
with an upward rotating movement.
4. Break out the internal jumper of the STO contact with the aid of a small screwdriver or small
needle-nose pliers. Otherwise the customer unit cannot be installed.
Information
Once the jumper has been removed the frequency inverter cannot be operated with functional safety
without CU5.
5. Hook the customer unit onto the upper edge and press in lightly until it engages. Take care that the
connector strip makes proper contact.
Remove the control
terminals and blank
cover.
Remove the STO
contact jumper.
Install the customer unit
SK CU5-STO.
Install the control
terminals and blank
cover.

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3 Commissioning
After installation, the necessary parameter settings must be made. The relevant parameters for
functional safety can be found under P424.
Parameters for functional safety
P424 Function Safety Dig. input
Setting range
0 … 2
Arrays
[-01] =
STO/SS1
[-02] =
SLS (in preparation)
Factory setting
{ all 0 }
Scope of Application
SK 510P
,
SK 540P
SK 530P and higher with SK CU5-MLT or SK CU5-STO
Description
Assignment of a fail-safe stop function for the safe digital input of the frequency
inverter.
Note
Changes to the parameter setting are only adopted after a restart of the frequency
inverter (Power Off 60 s Power On).
In case of a separate 24 V DC supply of the control board, this must also be switched
off.
Setting values
Value Meaning
0 No function
1
Disable voltage
The FI output voltage is switched off; the motor runs down freely.
2
Quick stop
The FI reduces the frequency according to the programmed fast
stop time from P426.

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4 Operating status messages
All faults which result in a switch-on block of the frequency inverter and are associated with functional
safety are listed below.
WARNING
Loss of safe function
In case of an EEPROM fault, the digital input functions "Block Voltage" and "Fast Stop" of the SS1-t
input VISD_24V may not function or may function incorrectly.
• After an EEPROM fault, the digital inputs associated with safety functions must be revalidated.
This ensures that the safety functions operate correctly.
Error messages
Display in the
SimpleBox / ControlBox Fault
Text in the ParameterBox
Cause
•Remedy
Group Error
E018
18.0
Safety circuit
(SafetyCirc)
While the frequency inverter was enabled, the Safe Pulse
Block safety circuit has triggered.
18.1
Safety circuit
(Safety SS1)
While the frequency inverter was enabled, the SS1 function
(controlled switch-off) has triggered.

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5 Technical Data
Safe Pulse Block
SK 510P SK CU5-STO
Input voltage
+ 24 V
Voltage tolerance
± 25 % (18 V … 30 V)
Operation with OSSD
- 20 % … + 25 % (19,2 V … 30 V)
Current consumption
STO
≤150 mA
VIS1: t.b.d (≤ 20 mA)
VIS2: ≤ 180 mA
(Average value)
SS1
≤10 mA
≤10 mA
Peak current (peak, when
switching on or on the OSSD)
STO
≤750 mA
VIS1: ≤ 75 mA
VIS2: ≤ 750 mA
SS1
≤25 mA
≤25 mA
Cable length
≤100 m
Cable capacitance
≤ 20 nF per connected frequency inverter
(≤ 4 nF * tOSSD / 0.1 ms with tOSSD max. 0.5 ms)
Switch-on delay
≤200 ms
Response time (the value in brackets
corresponds to a typical value)
STO
≤200 ms (t.b.d.)
≤200 ms (t.b.d)
SS1
≤10 ms (t.b.d.)
≤10 ms (t.b.d.)
Cycle time
≥1 s
Requirements for OSSDs
Test pulse width
≤500 µs
Duty (High level)
≥90 %
Time between double pulses ≥1 ms (observe the duty factor)
Safety integrity level
(as per IEC 61508)
STO
SIL 3
SIL 3
SS1
SIL 1
SIL 1
Probability of a hazardous failure
per hour
STO
PFH = t.b.d.
PFH = t.b.d.
SS1
PFH = t.b.d.
PFH = t.b.d.
Proportion of safe failures
STO
SFF = t.b.d. SFF = t.b.d.
SS1
SFF = t.b.d.
SFF = t.b.d.
Safety category
(as per EN ISO 13849-1)
STO
Category 4
Category 4
SS1
Category 1
Category 1
Performance Level
(as per EN ISO 13849-1)
STO
PL e
PL e
SS1
PL c PL c
Mean time until hazardous failure
STO
MTTF
d
= "High" (>100 years)
SS1
MTTF
d
= t.b.d.
Degree of diagnostic coverage
STO
DC = t.b.d.
DC = t.b.d.
SS1
DC = t.b.d.
DC = t.b.d.
Operational life
TM = 20 years