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Commissioning

4 Commissioning

4.1 Safety Instructions

See chapter 2 Safety for general safety instructions.

4.2 Activation of STO

The STO function is activated by removing the voltage at

terminal 37 of the frequency converter. By connecting the

frequency converter to external safety devices providing a

safe delay, an installation for a Safe Stop 1 can be

obtained. External safety devices need to fulfill Cat./PL or

SIL when connected to terminal 37. The STO function can

be used for asynchronous, synchronous, and permanent

magnet motors.

When the STO function (terminal 37) is activated, the

frequency converter issues an alarm, trips the unit, and

coasts the motor to a stop. Manual restart is required. Use

the STO function to stop the frequency converter in

emergency stop situations. In normal operating mode

when STO is not required, use the standard stop function

instead. Ensure that requirements according to ISO 12100

paragraph 6.3.3.2.5 are fulfilled before using the automatic

restart function.

4.3 Parameter Settings for STO in

Combination with VLT

Card MCB 112

When MCB 112 is connected, additional selections are

available for 5-19 Terminal 37 Safe Stop ([4] PTC 1 Alarm to

[9] PTC 1 & Relay W/A).

•

Selections [1]* Safe Stop Alarm and [3] Safe Stop

Warning are still available, but are for installations

without MCB 112 or any external safety devices.

If [1]* Safe Stop Alarm or [3] Safe Stop Warning are

selected and MCB 112 is triggered, the frequency

converter reacts with an alarm Dangerous Failure

[A72] and coasts the motor safely, without

automatic restart.

•

Selections [4] PTC 1 Alarm and [5] PTC 1 Warning

are not to be selected when an external safety

device is used. Those selections are for when only

MCB 112 uses the STO.

If selection [4] PTC 1 Alarm or [5] PTC 1 Warning is

selected and the external safety device triggers

STO, the frequency converter issues an alarm

Dangerous Failure [A72] and coasts the motor

safely, without automatic restart.

•

Select [6] PTC 1 & Relay A to [9] PTC 1 & Relay W/A

for the combination of external safety device and

MCB 112.

MG37D202

Operating Instructions

PTC Thermistor

CAUTION

Selections allow for automatic restart when the external

safety device is de-activated.

Before selecting [7] PTC 1 & Relay W or [8] PTC 1 & Relay

A/W, ensure that:

•

The unintended restart prevention is

implemented by other parts of the STO instal-

lation, or

•

A presence in the dangerous zone can be

physically excluded when STO is not activated.

In particular, paragraph 6.3.3.2.5 of ISO

12100:2010 must be observed.

See VLT

PTC Thermistor Card MCB 112 Operating

Instructions for further information.

4.4 Automatic/Manual Restart Behaviour

By default the STO function is set to unintended restart

prevention behaviour. To terminate STO and resume

normal operation:

Reapply 24 V DC supply to Terminal 37.

Give a reset signal (via Bus, Digital I/O, or [Reset]

key).

Set the STO function to automatic restart by setting the

value of 5-19 Terminal 37 Safe Stop from default value [1]*

Safe Stop Alarm to value [3] Safe Stop Warning.

Automatic restart means that STO is terminated, and

normal operation is resumed, as soon as the 24 V DC is

applied to terminal 37. No reset signal is required.

4.5 STO Commissioning Test

After installation and before first operation, perform a

commissioning test of the installation, using STO.

Perform the test again after each modification of the

installation or application involving the STO.

NOTICE

A succesful commissioning test of the STO function is

required after the initial installation, and after each

subsequent change to the installation.