Function library
Function blocks
9.2.41 Mains failure control (MFAIL)
9-152
L
EDSVS9332S-D11 EN 3.0
Commissioning
The commissioning should be carried out with motors without load.
1. ThedrivecanbestartedwithaLOW-HIGHedgeatX5/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. Setting the retrigger time
z In case of mains failure detection by detecting the DC bus voltage level:
– Set measured deceleration time from item 2. under C0983.
z In case of mains failure detection via an external system (e.g. supply module 934X):
– Under C0983, set the time in which the drive is to be continued to be braked in a controlled
wayforshort-termmainsrecovery.
4. Switch off supply voltage (mains or DC bus).
The oscilloscope should display the following characteristic:
U G
t 1 t 2
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. 9-103 Schematic representation with activated mains failure control (ideal characteristic)
t1 Mains failure
t2 Zero speed reached
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