Instruction Manual
Functional safety with NORD SK 200E frequency inverters
50 BU 0230 GB-2712
List of the functions relevant to functional safety for the digital inputs P420[-01] ... [-04]
Value
Function
Description
Signal
00
No function
Input switched off.
---
10
1
Disable voltage
The FI output voltage is switched off; the motor runs down freely.
Low
11
1
Emergency stop
The FI reduces the frequency according to the programmed fast
stop time P426.
Low
1
Also effective for bus control (RS232, RS485, CANbus, CANopen, DeviceNet, Profibus, InterBus, AS-Interface)
A complete list of all possible functions can be found in Manual BU 0200 GB.
Parameter
[factory setting]
Setting value / Description / Note
Device
Supervisor
Parameter
set
P426
Quick stop time
S
P
0 ... 320.00 sec
[ 0.10 ]
Setting of the stop time for the fast stop function which can be triggered either via a digital input,
the bus control, the keyboard or automatically in case of a fault.
Emergency stop time is the time for the linear frequency decrease from the set maximum
frequency (P105) to 0Hz. If an actual setpoint <100% is being used, the emergency stop time is
reduced correspondingly.
P428
Automatic starting
S
P
0 ... 1
[ 0 ]
In the standard setting (P428 =0 Off) the inverter requires a flank to enable (signal change
from "low high") at the relevant digital input.
In the setting On 1 the FI reacts to a High level. This function is only possible if the FI is
controlled using the digital inputs. (see P509=0/1)
In certain cases, the FI must start up directly when the mains are switched on. For this P428 = 1
On can be set. If the enable signal is permanently switched on, or equipped with a cable
jumper, the FI starts up immediately.
NOTE: The "Automatic Start" function can only be used if a digital input of the frequency
inverter (DIN 4) is parameterised to the function "Enable Right" or "Enable
Left" and this input is permanently set to "High". The digital inputs of the technology
units (e.g.:SK CU4 - IOE) do not support this "Automatic Start" function.
NOTE: The "Automatic Start" function can only be activated if the frequency inverter has
been parameterised to local control ((P509) setting { 0 } or { 1} ).
P434 [- 01]
[- 02]
Digital output function
0 ... 39
[ 7 ]
[-01] = Digital output 1, Digital output 1 of the frequency inverter
[-02] = Digital output 2, Digital output 2 of the frequency inverter (only SK 2x0E)
Control terminals 1/40
Various function can be assigned to the digital output: The following list shows the functions
relevant to functional safety and their logic. This behaviour can be inverted by a negative value
in P435.
A complete list of all functions can be found in Manual BU 0200 GB.