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Product description
Wieland Electric GmbH | BA001052 (Rev. A) | 11/2018
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Product description
NOTE:
Use latest device Documentation, Software and Firmware to ensure reliable operation of the system (down-
loadable from www.wieland-electric.com).
The UPS 20-960 is a microprocessor controlled unit that can perform two functions:
•
UPS rated 960 W / 20 A usable in any system rated 12 … 48 V DC
•
DC-DC converter (non-isolated) rated 960 W / 20 A usable in any combination of IN/OUT voltages
12 … 48 V DC
For the UPS function, it may use a battery of 12 V, independently of the operating load voltage. For any
supply voltages (12 … 48 V DC) it may use also multiple battery configuration (10 … 58 V DC). The UPS
module monitors the voltage coming from a DC power supply and in case of power failure a backup
battery is supplying the energy to the load. In normal condition the battery is kept charged by an inte-
grated battery charger supporting various battery chemistries.
As a DC-DC converter (no battery present) the input must be connected to the battery connector. The
input voltage is converted to any output voltage as per the set-up.
3.1
Overview of the UPS module's front
NOTE
1.
Alarm LED indicator
: ON when the unit is in
backup. Blinks at 1 Hz rate in case of error.
2.
Modbus over USB
: Used to connect a PC with
user software or custom application for remote
monitoring and controlling. Firmware update is
also possible through USB connection.
3.
Temperature sensor
: Optional temperature sen-
sor (
wipos
UPS 20 Sensor) to measure the battery
temperature for protection and temperature com-
pensated charge method.
4.
Terminal block 1
5.
Terminal block 2
6.
Display area:
provides information regarding the
device status.
7.
Control keys:
4 push buttons are provided to navi-
gate through the menus and to select the various
functions.
8.
Relays dry contacts:
2 relays (signal contacts) are
present for remote monitoring. See no. 26 in sec-
tion 6.2 for more details.
9.
Modbus over RS485:
Used to connect a PC with
user software or custom application for remote
monitoring and controlling. Firmware update is
also possible through RS485 connection.
10.
Inhibit input:
A voltage between 5 V DC and
30 V DC applied to this input activates the inhibit
function. See section 5.4 for more details.
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Figure 1 Front panel view
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Figure 2 Terminal block 1