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NORD Drivesystems BU0230 User Manual

Page 50

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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

1 … 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.