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Function library, Function blocks – Lenze EVS9332xK User Manual

Page 234

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Function library

Function blocks

3.2.62

Mains failure control (MFAIL)

3−206

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EDSVS9332K−EXT EN 4.0

Commissioning

The commissioning should be carried out with motors without load.

1. The drive can be started with a LOW−HIGH edge at X5/E5.

2. Set the acceleration time Tir:

– Set speed setpoint to 100%, operate controller with maximum speed.

– Inhibit controller via terminal X5/28 (you can also use any other controller inhibit source,

CINH) and measure deceleration time until standstill.

– Set approx. 1/10 of the deceleration time in C0982.

3. Set the retrigger time

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In case of mains failure detection by detecting the DC bus voltage level:

– Set measured deceleration time from (step 2.) under C0983.

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In case of mains failure detection via an external system (e.g. supply module 934X):

– Under C0983, you can set the time in which the drive is to be continued to be braked in a

controlled way for short−term mains recovery.

4. Switch off supply voltage (mains or DC bus).

The oscilloscope should display the following characteristic:

t

U G

t 1

t 2

t

n

0

0

C M P 2 - O U T

M F A I L - D C - S E T

O p e r a t i n g t h r e s h o l d

S w i t c h - o f f t h r e s h o l d O U

S w i t c h - o n t h r e s h o l d b r a k e u n i t

S w i t c h - o f f t h r e s h o l d L U

Fig. 3−156

Schematic representation with activated mains failure control (ideal characteristic)

t1 Mains failure
t2 Zero speed reached

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