Allen-Bradley DC-UPS Manual page 14

DC-UPS - 24V, 20 A, 480 W Reference Manual
14
sensor is installed, the end-of-charge-voltage is fixed to a value that
corresponds to a battery temperature of 40 °C.
Use a PT1000 temperature sensor or battery modules, which have this sensor
already included. A list of suitable PT1000 temperature sensors from different
vendors can be provided.
Setting of battery size selector
Allowed battery sizes
Battery voltage
Battery charging current
End-of-charge-voltage
Temperature range for which
the charging process is
(3)
enabled
Deep-discharge protection
Required min battery voltage
(4)
to allow charging
(5)
Battery charging time
Battery discharge current
(1) Batteries smaller than 6Ah are only recommended when the load current is below 10 A.
(2) The end-of-charge voltage depends on the battery temperature. At 20 °C the end-of-charge voltage is set to 13.6V (rsp. 27.2V)
and changes with -18mV/°C for 12V batteries and -36mV/°C for 24V batteries but not higher than 14.2V rsp. 28.4V.
(3) Corresponds to the temperature readings of the external temperature sensor of the battery and is not the surrounding air
temperature of the DC-UPS. Frequent charging below +5 °C (41 °F) reduced the lifetime of the battery and should be avoided.
Low temperatures increase the battery impedance and also change the battery characteristics. This could result in a false
"replace battery" signal or an unexpected interruption of a buffer event, especially with small batteries. To avoid this, the
temperature range for charging is limited at low temperatures depending on the battery size. If the end application requires
temperatures below +5 °C, it is recommended to use batteries >10 Ah.
(4) Below this voltage level, charging does not start and the DC-UPS reports "check wiring".
(5) The listed charging time applies for a complete discharged battery until the DC-UPS indicated "Ready" with the green status
LED. In practice, the charging time can be much shorter, since the battery is not completely discharged. An extended
charging time is likely caused by a defective or old battery.
Rockwell Automation Publication 1606-RM008A-EN-P - November 2021
small battery < 10 large battery >
Ah 10 Ah
(1)
Nom 3.9 Ah...10 Ah 10 Ah... 150 Ah
Nom 24V 24V
Typ 1.5 A 3 A
Typ 2 x13.25V 2 x13.25V
Typ 26.5V 26.5V
(2)
Typ 2x 13.1 ...14.2V
2x 13.1 ...14.2V
Typ 26.2V...28.4V 26.2V...28.4V
Nom -10...+50°C -40... +50°C
Typ 10.5V / 9.0V 10.5V / 9.0V
Typ 21V / 18V 21V / 18V
Min 2 x 7V 2 x 7V
Min 14V 14V
Max 4 h 40 mins —
Max 8 h 4 h
Max 44 h 22 h
Max 94 h 47 h
Typ 170 mA 170 mA
2x 12V batteries in series
In constant current mode
center-tap connected, no
temperature sensor connected
center-tap not connected, no
temperature sensor connected
center-tap connected, temperature
sensor connected
center-tap not connected,
temperature sensor connected
At 0 A / 20 A buffer current, center-
tap connected, Buffering stops as
soon as one battery falls below this
value.
At 0 A / 20 A buffer current, center-
tap not connected
center-tap connected
center-tap not connected
for a 7 Ah battery
for a 12 Ah battery
for a 65 Ah battery
for a 140 Ah battery
in battery mode at no output
current