Datasheet

UF20.241
–
U-Series
24V, 20A, 200ms
Dec 2005 / Rev. 1.2 / DS-UF20.241-EN / All parameters are specified at 24V, 20A and 25°C ambient unless otherwise noted.
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8. FUNCTIONAL DIAGRAM
Fig. 8-1 Functional diagram
Buffer Capacitor
Charger &
Inrush Limiter
Buffer
Capacitor
Buffer Capacitor
Discharger
Status
lamp
7 Active
6 +
Ready Monitor
+
-
Active Monitor
+
-
Optokoppler
Optokoppler
8 Ready
9 Inhibit
Optokoppler
Buffer
Capacitor
Shut-Down
Input / Output
Voltage Monitor
Back-up
Level
Selector
Reverse-
Polarity
Protection
-
-
+
+
Safety and
Over-
Voltage
Protection
Chassis
Ground
9. FRONT SIDE AND USER ELEMENTS
Fig. 9-1 Front side
I/O Power Port
Quick-connect spring-clamp
terminals,
+ Positive terminal
- Negative terminal
Chassis Ground
to bond the housing
Status lamp
OFF: Buffer is discharged, or
terminal voltage is below 22V
ON: Unit is fully charged
Flashes 1,25Hz:
Unit is in charging mode
Flashes 10Hz:
Unit is in discharging mode
Signal Port
Plug Connector
6 common + pole
7 Active: unit is buffering
8 Ready: unit is on stand-by
9 Inhibit: initiates buffer
discharging and inhibits
recharging of capacitors
Back-up threshold jumper
1-2: Fixed mode, (factory setting)
Unit switches to buffer mode as soon as
the voltage falls below 22.5V
2-3: Variable mode
Unit switches to buffer mode when input
voltage decreases by 1V within 0.54V/s or
the input voltage falls below 22.5V.
Missing jumper = 22.5V fixed
Set the unit to fixed mode:
- when power supplies other than the
Dimension Q-Series are used
- with back-feeding loads
- when the buffer unit is placed close to
the load
- whenever in doubt
Set the unit to variable mode:
- for 28V applications
- when the buffer unit is placed close to
the power supply