Bender VME420 - Function; Preset Function

Function
15
VME420_D00026_03_M_XXDE/04.2019
3.3 Function
Once the supply voltage is applied, the start-up delay "t" begins. Measured
values changing during this time do not influence the switching state of the
alarm relays.
The devices provide two separately adjustable measuring channels
(overvoltage/undervoltage). If the measured value drops below the response
value Alarm 2 or exceeds the response value (Alarm 1), the set response delays
"ton 1/2" start. Once the response delay has elapsed, the alarm relays switch
and the alarm LEDs light up. If the measuring value exceeds or falls below the
release value (response value plus hysteresis) after the alarm relays have
switched, the selected delay on release "t
off
" starts. Once "t
off"
has elapsed, the
alarm relays switch back to their initial position. If the fault memory is enabled,
the alarm relays remain in alarm state until the reset button R is pressed.
3.4 Preset function
After connecting the system to be monitored for the first time, the response
values for overvoltage and undervoltage (Alarm 1/2) are automatically set
once to:
Response value overvoltage ( > U): 1.1 U
n
Response value undervoltage ( < U): 0.85 U
n
Response value overfrequency ( > f) at 16.7 Hz, 50 Hz, 60 Hz: f
n
+ 1 Hz
Response value overfrequency ( > f) at 400 Hz: f
n
+ 1 Hz
Response value underfrequency ( < f) at 16.7 Hz, 50 Hz, 60 Hz: f
n
- 1 Hz
Response value underfrequency ( < f) at 400 Hz: f
n
- 1 Hz
Preset VME420
U
n
Preset
operating range
Response value
< U
Response value
> U
230 V 196…253 V 196 V 253 V
120 V 102…132 V 102 V 132 V
60 V 51…66 V 51 V 66 V
24 V 20.4…26.4 V 20.4 V 26.4 V