Q.
1. G
This uninterruptible power supply (UPS) controller
UBC10.241 with integrated battery is a compact
addition to standard 24V power supplies to bridge
power failures or voltage fluctuations. Expensive
downtimes, long restart cycles and loss of data can
be avoided.
The DC-UPS includes a professional battery
management system which charges and monitors
the battery to achieve the longest battery service life
as well as many diagnostic functions that ensure a
reliable operation of the entire system.
A unique feature of the UBC10.241 is that only one
12V battery is required to buffer the 24V output.
This makes matching batteries unnecessary and
allows a precise battery charging and testing.
The UBC10.241 has one integrated 12V 5Ah high
current VRLA battery, which is easy to change.
In addition to the UBC10.241, a separate UPS
controller (UB10.241) which requires an external 12V
battery is available when a longer buffer time is
required.
ENERAL DESCRIPTION
U–Series
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
DC-UPS
Compact and Easy to Install
■
■
Longest Buffer Time in Class
■
Easy Battery Access
Stable Output Voltage in Buffer Mode
■
Superior Battery Management for Longest Battery Life
■
■
Temperature Compensated Battery Charging
■
Comprehensive Diagnostics and Monitoring Functions
■
Replace Battery Signal Included
■
Electronically Overload and Short Circuit Protected
50% Power Reserves
■
■
Selectable Buffer Time Limiter
2. S
Input voltage nom. 24Vdc
range 22.5-30Vdc
Output current min. 15A Normal mode
min. 10A Buffer mode
Output voltage typ. 0.23V lower
22.25V Buffer mode, 10A
Integrated battery 12V 5Ah VRLA lead acid
Temperature range 0 to 40°C Operational
Dimensions 123x124x119mm WxHxD
Buffer time typ. 16’15” At 5A load
typ. 6’15” At 10A load
Typical setup of a DC-UPS system with the UBC10.241:
WITH INTEGRATED BATTERY
24V
DC-UPS
HORT-FORM DATA
as input voltage
AC
24V
Power
Supply
e.g.:
Dimension
UBC10.241
Normal mode
24V
Load
e.g.: PLC
DC
3. O
DC-UPS
UBC10.241-N1
Accessories UZB12.051
RDER NUMBERS
UBC10.241
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
Standard unit
Battery not assembled
Battery 12V 5Ah
4. M
CUS
ARKINGS
IND. CONT. E
UL 508
R
182790
UL 60950-1
GL
Marine
Class I Div 2
EMC, LVD
1/23
NDEX
I
1. General Description ............................................1
2. Short-form Data ..................................................1
3. Order Numbers....................................................1
4. Markings..............................................................1
5. Input ....................................................................3
6. Output in Normal Mode .....................................4
7. Output in Buffer Mode.......................................5
8. Battery Input .......................................................6
9. Buffer Time..........................................................7
10. Efficiency and Power Losses................................8
11. Functional Diagram.............................................8
12. Check Wiring and Battery Quality Tests.............9
13. Relay Contacts and Inhibit Input......................10
14. Front Side User Elements ..................................12
15. Terminals and Wiring........................................13
16. Reliability...........................................................13
P
U–Series
AGE
I
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
NDEX
17. EMC ................................................................... 14
18. Environment ..................................................... 15
19. Protection Features .......................................... 15
20. Safety ................................................................ 16
21. Approvals.......................................................... 16
22. Fulfilled Standards............................................ 16
23. Used Substances ............................................... 17
24. Physical Dimensions and Weight..................... 17
25. Installation Notes ............................................. 18
26. Replacement of the battery............................. 19
27. Accessories ........................................................ 20
28. Application Notes............................................. 21
P
28.1. Battery Replacement Intervals............... 21
28.2. Parallel and Serial Use............................ 22
28.3. Using the Inhibit Input........................... 23
28.4. Troubleshooting..................................... 23
AGE
NTENDED USE
I
The unit shall only be installed and put into operation by qualified personnel.
This unit is designed for installation in an enclosure and is intended for general use, such as in industrial control,
office, communication, and instrumentation equipment. Do not use this device in aircraft, trains and nuclear
equipment, where malfunctioning of the power supply may cause severe personal injury or threaten human life.
T
ERMINOLOGY AND ABREVIATIONS
DC-UPS Uninterruptible power supply with DC-Input.
Normal mode Describes a condition where the battery is charged, the input voltage is in range and the output is
Buffer mode Describes a condition where the input voltage is below the transfer threshold level, the unit is
Charging mode Describes a condition where the battery is being charged, the input voltage is in range and the
Inhibit mode Describes a condition where buffering is disabled on purpose by using the inhibit input of the DC-
Buffer time Same as the term “hold-up time”.
T.b.d. To be defined, value or description will follow later.
ISCLAIMER
D
The information presented in this document is believed to be accurate and reliable and may change without notice.
Some parts of this unit are patent by PULS (US patent No 091662,063, Des. 424,529, …).
No part of this document may be reproduced or utilized in any form without permission in writing from the publisher.
loaded within the allowed limits.
running on battery (buffering) and the output is loaded within the allowed limits.
output is loaded within the allowed limits.
UPS. (e.g. for service actions, or to save battery capacity)
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
2/23
U–Series
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
NPUT
5. I
Input voltage nom. DC 24V
Input voltage ranges nom. 22.5 to 30Vdc Continuous operation, see Fig. 5-1
30 to 35Vdc Temporarily allowed, no damage to the DC-UPS *)
35Vdc Absolute maximum input voltage with no damage to the
0 to 22.5Vdc The DC-UPS switches into buffer mode and delivers
DC-UPS
output voltage from the battery if the input was above
the turn-on level before and all other buffer conditions
are fulfilled.
Allowed input voltage ripple
max. 1.5Vpp Bandwidth <400Hz
1Vpp Bandwidth 400Hz to 1kHz
Allowed voltage between input
and earth (ground)
Turn-on voltage typ. 22.8Vdc The output does not switch on if the input voltage does
max. 60Vdc or
42.4Vac
not exceed this level.
max. 23Vdc
Input current **) typ. 120mA Internal current consumption
typ. 1.1A Current consumption for battery charging in constant
current mode at 24V input See Fig. 8-2 ***)
External capacitors on the input No limitation
*) The DC-UPS shows “Check Wiring” with the red LED and buffering is not possible
**) The total input current is the sum of the output current, the current which is required to charge the battery during the
charging process and the current which is needed to supply the DC-UPS itself. See also Fig. 5-2. This calculation does not apply
in overload situations where the DC-UPS limits the output current, therefore see Fig. 5-3.
***) Please note: This is the input current and not the current which flows into the battery during charging. The battery current can
be found in chapter 8.
Fig. 5-1 Input voltage range Fig. 5-2 Input current, definitions
V
OUT
D
AB
C
Input
Current
Output
Current
18 30 35V22.50
A: Rated input voltage range
B: Temp. allowed, no harm to the unit
C: Absolute max. input voltage
D: Buffer mode
V
IN
Internal
current
consumption
Current
consumption
for battery
charging
Electronic output current limitation
The DC-UPS is equipped with an electronic output
current limitation. This current limitation works
in a switching mode which reduces the power
losses and heat generation to a minimum. As a
result, the output voltage drops since there is not
enough current to support the load. A positive
effect of the current limitation in switching mode
is that the input current goes down despite an
increase in the output current resulting in less
stress for the supplying source.
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
Fig. 5-3 Input current and output voltage vs.
output current, typ. (battery fully charged)
20V
10
20A
15
10
5
0
Output Voltage
e
r
r
u
C
t
u
p
n
I
O
t
p
u
u
t
C
u
r
r
0
4812 20A
n
e
Overload
t
n
t
15
3/23
U–Series
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
6. O
UTPUT IN NORMAL MODE
Output voltage in normal mode
Voltage drop between input and
output
nom. DC 24V The output voltage follows the input voltage reduced by
the input to output voltage drop.
max. 0.3V At 10A output current, see Fig. 6-1 for typical values
max. 0.45V At 15A output current, see Fig. 6-1 for typical values
Ripple and noise voltage max. 20mVpp 20Hz to 20MHz, 50Ohm *)
Output current nom. 15A Continuously allowed
Output power nom. 360W Continuously allowed
Short-circuit current min. 17.9A Load impedance 100mOhm, see Fig. 6-2 for typical values
max. 21A Load impedance 100mOhm, see Fig. 6-2 for typical values
Capacitive and inductive loads No limitation
*) This figure shows the ripple and noise voltage which is generated by the DC-UPS. The ripple and noise voltage
might be higher if the supplying source has a higher ripple and noise voltage.
Fig. 6-1 Input to output voltage drop, typ.
Input to Output
Voltage drop
0.4V
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
02 10
468 121416
p
u
t
u
O
t
n
e
r
r
u
C
t
18A
Fig. 6-2 Output voltage vs. output current in
normal mode at 24V input, typ.
Output Voltage
28V
24
20
16
12
8
4
0
0 5 10 15 20
Output Current
25A
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
4/23
A
U–Series
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
7. O
UTPUT IN BUFFER MODE
If the input voltage falls below a certain value (transfer threshold level), the DC-UPS starts buffering without any
interruption or voltage dips. Buffering is possible even if the battery is not fully charged.
Output voltage in buffer mode nom. DC 24V Output voltage is stabilized and independent from
22.45V ±1%, at no load,
battery voltage
22.25V ±1%, at 10A output current
Transfer threshold for buffering
typ. 80mV higher than the output voltage in buffer mode
Ripple and noise voltage max. 20mVpp 20Hz to 20MHz, 50Ohm
Output current nom. 10A Continuously allowed
15A < 5s with full output voltage *)
Short-circuit current min. 17.9A Load impedance 100mOhm **)
max. 21A Load impedance 100mOhm **)
*) If the output current is in the range between 10A and 15A for longer than 5s, a hardware controlled reduction of the
maximal output current to 10A occurs. If the 10A are not sufficient to maintain the 24V, buffering stops after another 5s. The
buffering is possible again as soon as the input voltage recovers.
**) If the nominal output voltage cannot be maintained in buffer mode, the DC-UPS switches off after 5s to save battery
capacity.
Fig. 7-1 Buffering transition, definitions Fig. 7-2 Transfer behavior, typ.
O
u
t
p
u
Input
voltage
28V
24V
Transfer
threshold
4
2
V
2
2
.
5
2
V
a
t
1
0
A
t
o
V
a
l
t
g
e
4
2
V
t
Output
voltage
t
e
l
a
g
o
t
u
V
n
I
Buffer mode
0
t
V
p
V
I
m
/
s
D
5
0
0
Fig. 7-3 Available output current in buffer
Output
Current
15A
10A
mode
BonusPower
5A
0
05 Sec.
®
Time
Fig. 7-4 Output voltage vs. output current in
Output Voltage
25V
20
15
10
5
0
0
Continuously available
A
Available for 5s then auto switching to curve
B
Buffering will stop after 5s
C
D
Buffering will stop after 5s
buffer mode, typ.
A B
CD
Output
Current
5101520
25
D
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
5/23
U–Series
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
8. B
ATTERY
The required 12V VRLA battery is included with this unit. For more details on battery requirements see chapter 26.
Battery voltage nom. DC 12V Maintenance-free 12V VRLA lead acid battery.
Battery voltage range 9.0 – 15.0V Continuously allowed, except deep discharge
max. 35Vdc Absolute maximum voltage with no damage to the
protection
unit.
typ. 7.4V Above this voltage level battery charging is possible
Allowed battery capacity nom. 5Ah High-current version
Battery charging method CC-CV Constant current, constant voltage mode
Battery charging current nom. 1.5A CC-mode, Independent from battery size
max. 1.7A Corresponding 24V input current see Fig. 8-2
End-of-charge-voltage (CV-mode) typ. 13.1 - 14V Automatic setting according to ambient temperature
Battery charging time typ. 3h *)
Battery discharging current **) typ. 21A Buffer mode, 10A output current, 11.5V on the battery
terminal of the DC-UPS, see Fig. 8-1 for other
parameters
typ. 0.3A Buffer mode, 0A output current
max. 50μA At no input, buffering had switched off, all LEDs are
typ. 270mA At no input, buffering had switched off, yellow LED
off
shows “buffer time expired” (max. 15 minutes)
Deep discharge protection ***) typ. 10.5V At 0A output current
typ. 9.0V At 10A output current
*) The charging time depends on the duration and load current of the last buffer event. The numbers in the table represent a
fully discharged battery. A typical figure for a buffer current of 10A is 2h 20Min. for a 5Ah highcurrent battery. Above 40°C
charging time can be longer.
**) The current between the battery and the DC-UPS is more than twice the output current. This is caused by boosting the 12V
battery voltage to a 24V level.
***) To ensure longest battery lifetime, the DC-UPS has a battery deep discharge protection feature included. The DC-UPS stops
buffering when the voltage on the battery terminals of the DC-UPS falls below a certain value.
Battery Current
30A
Fig. 8-1 Battery discharging current
vs. output current, typ.
25
20
15
10
5
0
0
2.5 7.5 10 15A12.55
O
t
p
u
u
t
C
u
Voltage on
battery terminal
of the DC-UPS:
A:
10.5V
B:
11V
C:
12V
r
r
e
n
t
A B C
Fig. 8-2 Required input current vs. input
voltage for battery charging
Input Current
1.5A
1.25
1.0
m
a
x
.
(
b
a
t
t
e
r
y
c
ha
r
g
i
n
g
c
u
r
r
e
t
y
p
.
(
ba
t
t
e
r
y
c
h
a
r
g
n
i
n
g
c
ur
r
e
0.75
0.5
0.25
0
23
I
n
p
u
V
o
t
a
t
l
g
e
24 25 26 28V
27
t
1
.
7
A
)
n
t
1
.
5
A
)
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
6/23
U–Series
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
9. B
UFFER TIME
The buffer time depends on the capacity and performance of the battery as well as the load current. The diagram
below shows the typical buffer times of the standard battery.
Buffer time with 5Ah high-current battery min. 13’24’’ At 5A output current *)
min. 4’54’’ At 10A output current *)
typ. 16’15’’ At 5A output current, see Fig. 9-1 **)
typ. 6’15’’ At 10A output current, see Fig. 9-1 **)
*) Minimum value includes 20% aging and requires a fully charged (min. 24h) battery.
**) Typical value includes 10% aging and requires a fully charged (min. 24h) battery.
Fig. 9-1
Buffer time vs. output current with a 5Ah high current battery
Buffer Current
10A
8
6
4
2
0
515
UZB12.051
12V 5Ah high current battery
Buffer Time (Minutes)
2010 25 30 35 45 5040 55 60 65 70 75 80 85
90
Min.
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
7/23
U–Series
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
10. E
FFICIENCY AND POWER LOSSES
Efficiency typ. 97.8% Normal mode, 10A output current, battery fully charged
Power losses typ. 2.9W Normal mode, 0A output current, battery fully charged
typ. 5.5W Normal mode, 10A output current, battery fully charged
typ. 5.0W During battery charging, 0A output current
Fig. 10-1 Efficiency at 24V, typ. Fig. 10-2 Losses at 24V, typ.
Efficiency vs. output
current in normal mode
98%
97.5
97.0
96.5
96.0
95.5
95.0
94.5
39
5 7 11 13
t
e
n
r
r
u
C
t
u
t
p
u
O
15A
Power losses versus output
current in normal mode
8W
7
6
5
4
3
2
1
0
07.5
O
2.5 5 10 12.5
u
C
t
p
u
t
u
t
n
e
r
r
15A
11. F
UNCTIONAL DIAGRAM
Fig. 11-1 Functional diagram
DC-UPS Control unit with integrated battery
Input Fuse
24V
Power
Supply
+
Input
-
*) Return current protection; This feature utilizes a Mosfet instead of a diode in order to minimize the voltage drop and power
losses.
&
Reverse
Polarity
Protection
Battery Charger
&
Tester
12V 5Ah battery
-
+
*
Cut-off
Relay
Fuse
Step-up
Converter
(1) (2)
Ready
Contact
Controller
(3) (4)
Buffering
Contact
Electronic
Current
Limiter
(5) (6)
Replace
Battery
Contact
+
Output
Buffered
Load
-
Status LED (green)
Diagnosis LED (yellow)
Check Wiring LED (red)
Buffer-time Limiter
10s, 30s, 1m, 3m, 10m,
(7)
Inhibit +
(8)
Inhibit -
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
8/23
12. C
The DC-UPS is equipped with an automatic “Check Wiring” and “Battery Quality” test.
“Check Wiring” test:
Under normal circumstances, an incorrect or bad connection from the battery to the DC-UPS or a missing (or blown)
battery fuse would not be recognized by the UPS when operating in normal mode. Only when back up is required
would the unit not be able to buffer. Therefore, a “check wiring” test is included in the DC-UPS. This connection is
tested every 10 seconds by loading the battery and analyzing the response from the battery. If the resistance is too
high, or the battery voltage is not in range, the unit displays “Check Wiring” with the red LED. At the same time the
green “Ready” LED will turn off.
“State of Health” (SoH) test:
The battery has a limited service life and needs to be replaced in a fixed interval which is defined by the specified
service life (acc. to the Eurobat guideline), based on the surrounding temperature and the number of
charging/discharging cycles. If the battery is used longer than the specified service life, the battery capacity will
degrade. Details can be found in chapter 28.1. SoH test can not determine a gradual loss in capacity. However, it can
detect a battery failure within the specified service life of the battery. Therefore a SoH-test is included in the DC-UPS.
The SoH test consists of different types of tests:
A battery problem is indicated with the yellow LED (replace battery pattern) and the relay contact “Replace Battery”.
Please note that it can take up to 50 hours until a battery problem is reported. This should avoid nuisance error
messages as any urgent battery problems will be reported by the “Check Wiring” test and create a warning signal.
The battery tests require up to 50h uninterrupted operation. Any interruptions in the normal operation of the DCUPS may result in the “Replace Battery” test cycle to start over.
When “Replace battery” is indicated, it is recommended to replace battery as soon as possible.
HECK WIRING AND BATTERY QUALITY TESTS
During charging:
If the battery does not reach the ready status (see chapter 14) within 30h, it is considered to be defective.
The reason could be a broken cell inside the battery.
During operation:
Once the battery is fully charged, a voltage drop test and a load test is performed alternately every 8 hours.
Three of the tests must consecutively produce negative results to indicate a battery problem.
U–Series
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
9/23
13. R
The DC-UPS is equipped with relay contacts and signal inputs for remote monitoring and controlling of the unit.
Relay contacts:
Ready: Contact is closed when battery is charged more than 85%, no wiring failure are recognized, input
Buffering: Contact is closed when unit is buffering.
Replace Battery: Contact is closed when the unit is powered from the input and the battery quality test (SOH test)
Relay contact ratings max 60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A resistive load
min 1mA at 5Vdc min.
Isolation voltage max 500Vac, signal port to power port
Signal input:
Inhibit: The inhibit input disables buffering. In normal mode, a static signal is
Signal voltage max. 35Vdc
Signal current max. 6mA, current limited
Inhibit threshold min. 6Vdc, buffering is disabled above this threshold level
max. 10Vdc
Isolation nom. 500Vac, signal port to power port
Restriction apply when using the signal and relay contacts in a Haz-Loc environment:
The Buffering, Ready and Replace Battery contact is intended to be used for a separately investigated nonincendive field wiring
and/or field wiring apparatus. The DC-UPS may be located in a Class I, Division 2 (Group A, B, C or D) hazardous (classified)
location. Associated apparatus must be installed in accordance with its manufacturer's control drawing and Article 504 of the
National Electrical Code (ANSI/NFPA 70) for installation in the United States, or Section 18 of the Canadian Electrical Code for
Installations in Canada.
Selected associated apparatus must be third part listed as providing nonincendive field circuits for the application, and have Voc
not exceeding Vmax, Isc not exceeding Imax.
Non associated nonincendive field wiring apparatures shall not be connected in parallel unless this is permitted by the associated
nonincendive field wiring apparatures approval.
ELAY CONTACTS AND INHIBIT INPUT
U–Series
voltage is sufficient and inhibit signal is not active.
reports a negative result.
required. In buffer mode, a pulse with a minimum length of 250ms is
required to stop buffering. The inhibit is stored and can be reset by
cycling the input voltage. See also section 28.1 for application notes.
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
7 +
3mA
Inhibit
5,1V
8 -
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
10/23
U–Series
Fig. 13-1 Contact control drawing for use in Haz-Loc
+
+
-
Input Output
Ready
DCUPS
Buffering
Replace
Battery
Battery
+
-
Hazardous
-
Location
1
2
3
4
5
6
environments
Isc
Voc
Isc
Voc
Isc
Voc
Non Hazardous
Location
Apparatus
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
Selected barriers must have entity parameters such that
Voc < V max, Isc < I max,
Ca > Ci + Ccable, La > Li + Lcable.
For Ccable and Lcable, if the capacitance per foot
or the inductance per foot is not known, then the
following values shall be used: Ccable = 60pF/foot
and Lcable = 0.2µH/foot.
Contact current: I max = 50mA
Contact voltage: V max. = 35V (DC or AC)
Max. associated circuit capacitance Ci = 0
Max. associated circuit inductance Li = 0
No polarity requirement
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
11/23
U–Series
14. F
RONT SIDE AND USER ELEMENTS
Main unit shown below without battery compartment.
A Power Port
Quick-connect spring-clamp terminals, connection for input voltage and
output voltage.
Signal Port
B
Plug connector with screw terminals, inserted from the bottom.
Connections for the Ready, Buffering, Replace Battery relay contacts and
for the Inhibit input. See details in chapter 13.
C Green Status LED
Ready: Battery is charged > 85%, no wiring failures are recognized, input
voltage is sufficient and inhibit signal is not active.
Charging: Battery is charging and the battery capacity is below 85%.
Buffering: Unit is in buffer mode.
Flashing pattern of the green status LED:
D Yellow Diagnosis LED
Overload: Output has switched off due to long overload in buffer mode
or due to high temperatures.
Replace battery: Indicates a battery which failed the battery quality test
(SoH test). Battery should be replaced as soon as possible.
Buffer-time expired: Output has switched off due to settings of Buffer-
timer Limiter. This signal will be displayed for 15 minutes.
Inhibit active: Indicates that buffering is disabled due to an active inhibit
signal.
Flashing pattern of the yellow diagnostic LED:
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Ready
Charging
Buffering
Overload
Replace
Battery
Buffer time
expired
Inhibit
active
E Red Check Wiring LED
This LED indicates a failure in the installation (e.g. too low input voltage), wiring, battery or battery fuse.
F Buffer-time Limiter:
User accessible dial which limits the maximum buffer time in a buffer event to save battery energy. When the
battery begins to recharge after a discharging event, the process is completed much faster since only the energy
which was taken out of the battery needs to be “refilled”. The following times can be selected: 10 seconds, 30
seconds, 1 minute, 3 minutes, 10 minutes or infinity (until battery is discharged) which allows buffering until the
deep discharge protection stops buffering.
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
12/23
15. T
Type Bi-stable, quick-connect spring-
Solid wire 0.5-6mm2 0.2-1.5mm2
Stranded wire 0.5-4mm2 0.2-1.5mm2
AWG 20-10AWG 22-14AWG
Ferrules Allowed, but not required Allowed, but not required
Pull-out force 10AWG:80N, 12AWG:60N,
Tightening torque Not applicable 0.4Nm, 3.5lb.in
Wire stripping length 10mm / 0.4inch 6mm / 0.24inch
Fig. 15-1 Spring-clamp terminals, connecting a wire
ERMINALS AND WIRING
1.
Insert the wire
To disconnect wire:
reverse the procedure
U–Series
Power terminals Signal terminals
clamp terminals. IP20 Fingertouch-proof. Suitable for fieldand factory installation. Shipped
in open position.
14AWG:50N, 16AWG:40N
according to UL486E
2.
Close the lever
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
Plug connector with screw terminal. Finger-touch-proof
construction with captive screws for 3.5mm slotted
screwdriver. Suitable for field- and factory installation.
Shipped in open position. To meet GL requirements,
unused terminal compartments should be closed.
Not applicable
Instructions:
a) Use appropriate copper cables, that are designed
for an operating temperature of 60°C
b) Follow national installation codes and regulations!
c) Ensure that all strands of a stranded wire enter the
terminal connection!
d) Up to two stranded wires with the same cross
section are permitted in one connection point
16. R
Lifetime expectancy min. 137 400h At 10A output current, 40°C
min. > 15 years At 5A output current, 40°C
min. > 15 years At 10A output current, 25°C
MTBF SN 29500, IEC 61709 886 000h At 10A output current, 40°C
1 482 000h At 10A output current, 25°C
MTBF MIL HDBK 217F 397 900 At 10A output current , 40°C, ground benign GB40
545 000 At 10A output current , 25°C, ground benign GB25
The Lifetime expectancy shown in the table indicates the operating hours (service life) and is determined by the
lifetime expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours.
Lifetime expectancy is calculated according to the capacitor’s manufacturer specification. The prediction model allows
a calculation of up to 15 years from date of shipment.
MTBF stands for Mean Time Between Failure, which is calculated according to statistical device failures and indicates
reliability of a device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily
represent the life of a product.
All values except battery.
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
ELIABILITY
13/23
U–Series
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
17. EMC
The unit is suitable for applications in industrial environment as well as in residential, commercial and light industry
environment without any restrictions. CE mark is in conformance with EMC guideline 89/336/EC and 93/68/EC and the
low-voltage directive (LVD) 73/23/EC, 93/68/EC.
A detailed EMC Report is available on request.
EMC Immunity
Electrostatic discharge EN 61000-4-2 Contact discharge
Electromagnetic RF field EN 61000-4-3 80MHz-1GHz 10V/m Criterion A
Fast transients (Burst) EN 61000-4-4 Out- and input lines 2kV Criterion A
Signal lines **) 2kV Criterion A
Surge voltage EN 61000-4-5 Output + Æ -
Conducted disturbance EN 61000-4-6 0,15-80MHz 10V Criterion A
*) DIN-Rail earthed
**) Tested with coupling clamp
EMC Emission
Conducted emission EN 55022 Input lines Class B *)
EN 55022 Output lines Class B *)
Radiated emission EN 55011, EN 55022 Class B
This device complies with FCC Part 15 rules.
Operation is subjected to the following two conditions: (1) this device may not cause harmful interference, and (2) this
device must accept any interference received, including interference that may cause undesired operation.
*) Informative measurement with voltage probe
Switching frequencies
Switching frequency of boost converter 100kHz Constant frequency
Switching frequency of electronic output current limitation 78kHz Constant frequency
Switching frequency of battery charger 19.5kHz Constant frequency
EN 61000-6-1, EN 61000-6-2
Air discharge
Input + Æ + / - Æ housing
EN 61000-6-3, EN 61000-6-4 Generic standards
The DC-UPS has three converters with three different
switching frequencies included.
Generic standards
8kV
15kV
500V
500V
500V
Criterion A*)
Criterion A *)
Criterion A
Criterion A
Criterion A
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
14/23
U–Series
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
18. E
NVIRONMENT
Operational temperature 0°C to +40°C (32°F to 104°F) Full output power
Storage temperature -20°C to +50°C (-4°F to 122°F) Storage and transportation
Humidity 5 to 95% r.H. IEC 60068-2-30
Do not energize while condensation is present
Vibration sinusoidal 2-17.8Hz: ±1.6mm; 17.8-500Hz: 1g *) IEC 60068-2-6
Shock 15g 6ms, 10g 11ms *) IEC 60068-2-27
Altitude 0 to 6000m Approvals apply only up to 2000m
Over-voltage category III EN 50178
II EN 50178 above 2000m altitude
Degree of pollution 2 EN 50178, not conductive
*) Use wall mounting accessory for higher values.
Fig. 18-1 Normal Mode: Output current vs.
Allowable Output
Current in Normal Mode
15A
12.5
10
7.5
5
2.5
Ambient Temperature
0
01020
ambient temperature
c
o
n
t
n
i
u
o
u
s
30 40 50
60°C
Fig. 18-2 Buffer Mode: Output current vs.
Allowable Output
Current in Buffer Mode
15A
12.5
10
7.5
5
2.5
0
ambient temperature
f
o
r
p
t
y
s
5
.
c
o
t
i
n
n
u
o
u
s
Ambient Temperature
01020 60°C
30 40 50
The ambient temperature is defined 2cm below the unit.
19. P
ROTECTION FEATURES
Output protection Electronically protected against overload, no-load and short-circuits
Output over-voltage protection
in buffer mode
typ. 32Vdc
max. 35Vdc
In case of an internal defect, a redundant circuitry
limits the maximum output voltage. The output
automatically shuts-down and makes restart attempts.
Degree of protection IP20 EN/IEC 60529
Penetration protection > 3.5mm E.g. screws, small parts
Reverse battery polarity protection yes Max. –35Vdc;
Wrong battery voltage protection yes Max. +35Vdc (e.g. 24V battery instead of 12V battery)
Battery deep discharge protection yes The limit is battery current dependent
Over temperature protection yes Output shut-down with automatic restart
Input over-voltage protection yes Max. 35Vdc, no harm or defect of the unit
Internal input fuse 25A, blade type No user accessible part, no service part
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
15/23
20. S
Output voltage SELV IEC/EN 60950-1
PELV EN 60204-1, EN 50178, IEC 60364-4-41
Class of protection II PE (Protective Earth) connection is not required
Isolation resistance > 5MOhm Power port to housing, 500Vdc
Dielectric strength 500Vac Power port to signal port
500Vac Power port / signal port to housing
Touch current (leakage current) The leakage current which is produced by the DC-UPS itself depends on the input
21. A
UL 508
UL 60950-1
UL 1604
The unit is suitable for use in Class I Division 2 Groups A, B, C, D locations as well as for Class I
CSA
IEC 60950-1
Marine
AFETY
PPROVALS
U–Series
Max. allowed voltage between any input, output or signal pin and ground:
60Vdc or 42.4Vac
voltage ripple and need to be investigated in the final application.
For a smooth DC input voltage, the produced leakage current is less than 100μA.
18WM
IND. CONT. EQ.
Zone 2 Groups IIA, IIB and IIC locations. Substitution of components may impair suitability for
Class I Division 2 environment. Do not disconnect equipment unless power has been switched
off. Wiring must be in accordance with Class I, Division 2 wiring methods of the National
Electrical Code, NFPA 70, and in accordance with other local or national codes.
R
CUS
182790
IECEE
CB SCHEME
GL
ABS
LISTED E198865 listed for use in U.S.A. (UL 508) and
Canada (C22.2 No. 14-95)
Industrial Control Equipment
RECOGNIZED E137006 recognized for the use in
U.S.A. (UL 60950-1) and Canada (C22.2 No. 60950)
Information Technology Equipment, Level 5
RECOGNIZED E246877 recognized for use in U.S.A. (UL 1604) and
Canada (C22.2 No. 213-M1987)
Hazardous Location Class I Div 2 T4 Groups A,B,C,D and
Class I Zone 2 Groups IIA, IIB and IIC
CSA approval for Canada
CAN/CSA C22.2 No 107-1; CAN/ CSA 60950-1-03; UL60950-1
CB Scheme,
Information Technology Equipment
GL (Germanischer Lloyd) classified and ABS (American Bureau for
Shipping) PDA for marine and offshore applications.
Environmental category: A, EMC2
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
22. F
EN/IEC 60204-1 Safety of Electrical Equipment of Machines
EN/IEC 61131 Programmable Controllers
EN 50178, IEC 62103 Electronic Equipment in Power Installations
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
ULFILLED STANDARDS
16/23
23. U
The unit does not release any silicone and is suitable for the use in paint shops.
The unit conforms to the RoHS directive 2002/96/EC.
Electrolytic capacitors included in this unit do not use electrolytes such as Quaternary Ammonium Salt Systems.
Plastic housings and other molded plastic materials are free of halogens.
The materials used in our production process do not include the following toxic chemicals:
Polychlorinated Biphenyl (PCB), Pentachlorophenol (PCP), Polychlorinated naphthalene (PCN), Polybrominated
Biphenyl (PBB), Polybrominated Biphenyl Oxide (PBO), Polybrominated Diphenyl Ether (PBDE), Polychlorinated
Diphenyl Ether (PCDE), Polybrominated Diphenyl Oxide (PBDO), Cadmium, Asbestos, Mercury, Silica
24. P
Width 123mm / 4.84’’
Height 124mm / 4.88’’ Plus height of signal connector plug and Spare fuse
Depth 119mm / 4.69’’ Plus depth of DIN-rail
Weight 2850g / 6.28lb
DIN-Rail Use 35mm heavy duty DIN-rails according to EN 60715 or EN 50022.
Electronic files with mechanical data can be downloaded at www.pulspower.com
SED SUBSTANCES
HYSICAL DIMENSIONS AND WEIGHT
U–Series
The DIN-rail height must be added to the depth (119mm) to calculate the total required installation
depth.
Fig. 24-1
Side view
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
Fig. 24-2
Front view
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
17/23
U–Series
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
25. I
NSTALLATION NOTES
Mounting:
The power terminals shall be located on top of the unit. An appropriate electrical and fire end-product enclosure
should be considered in the end use application.
Do not install unit in airtight housings or cabinets. The site in which the unit is located must have sufficient
ventilation acc. to EN50272-2.
Cooling: Convection cooled, no forced air cooling required. Do not obstruct air flow!
Installation clearances: 40mm on top, 20mm on the bottom, 5mm on the left and right side are recommended
when loaded permanently with full power. In case the adjacent device is a heat source, 15mm clearance are
recommended.
Risk of electrical shock, fire, personal injury or death!
Turn power off and disconnect battery fuse before working on the DC-UPS. Protect against inadvertent re-powering.
Make sure the wiring is correct by following all local and national codes. Do not open, modify or repair the unit,
except replacement of the battery. Use caution to prevent any foreign objects from entering into the housing.
Do not use in wet locations or in areas where moisture or condensation can be expected.
Service parts:
The DC-UPS contains an integrated battery which must be changed on a periodic basis, see chapter 26 and. 28.1.
The tripping of an internal fuse is caused by an internal fault. If damage or malfunctioning should occur during
operation, immediately turn power off and send unit to the factory for inspection! For Troubleshooting see 28.4.
Wiring and installation instructions:
(1) It is recommended to install the DC-UPS in a place where the integrated battery will not be heated up by
adjacent equipment. The unit is equipped with a fuseholder and a 30A battery fuse type ATO® 257 030
(Littelfuse). The battery fuse protects the wires between the battery and the DC-UPS. It also allows the
disconnection of the battery from the DC-UPS which is recommended when working on the battery or DC-UPS.
Disconnect battery fuse before connecting the battery.
(2) Connect the power supply to the input terminals of the DC-UPS.
(3) Connect the buffered load to the output terminals of the DC-UPS. The output is decoupled from the input
allowing load circuits to be easily split into buffered and non buffered sections. Noncritical loads can be
connected directly to the power supply and will not be buffered. The energy of the battery can then be used in
the circuits which require buffering.
(4) Plug-in the fuse when the wiring is finished.
Fig. 25-1
Typical wiring diagram
24V
unbuffered
branch
24V
buffered
branch
+
-
24V
Power
supply
NLPE
+
-
24V
IN
OUT
DC-UPS
UBC10.241
24V
+
-
+
-
Buffered
load
+
-
Unbuffered
load
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
18/23
26. R
The integrated battery should be replaced on a periodic basis, see chapter 28.1 for additional information.
The replacement should be done by qualified personnel trained on battery handling.
Caution! The terminals on the battery are always alive, therefore do not place items or tools on the battery!
How to replace the battery:
Step 1:
Remove
the fuse
before
working on
the unit.
Step 6: Install the new battery.
Step 7: Connect the red cable (+) to the red positive (+) terminal of the battery.
Step 8: Connect the black cable (-) to the black negative (-) terminal of the battery.
Step 9: Close the cover.
Step 10: Tighten the screw.
Step 11: Plug-in the fuse.
Disposal of batteries
Batteries marked with the recycling symbol should be recycled through a competent agency.
Replacement battery
See chapter 27 for information on the UZB12.051 or you can use a battery which meets the following requirements:
Battery type nom. 12V, 4 to 6Ah VRLA lead-acid maintenance free battery
Design life min. 3 to 5 years According to EUROBAT guideline
Dimensions nom. 70x106x90mm WxHxD *)
Pole connection 6.35mm/ 0.25Inch Blade type; Fast-on
Approvals UL, VdS For applications which require UL or VdS
Allowed discharge current min. 29A Continuous
*) Max. case height of 102mm
EPLACEMENT OF THE BATTERY
Step 2:
Loosen the
captive cover
screw.
U–Series
Step 3:
Remove the
battery-cover.
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
Step 4:
Disconnect the cables
from the battery
terminals.
Step 5:
Remove the
battery by pulling
on the strap.
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
19/23
27. A
Battery
The integrated battery should be replaced on a periodic basis, see chapter 28.1.
As replacement the UZB12.051 can be used.
UZB12.051
Battery type Highcurrent version
Design life 3 to 5 years According to EUROBAT guideline
Dimensions 70x106x90mm Width x total height x depth
Pole connection 6.35mm/ 0.25Inch Blade type; Fast-on
Weight 2kg/ 4.41lb
Order number UZB12.051 Battery for UBC10.241
CCESSORIES
U–Series
12V, 5Ah
Fig. 27-1
VRLA lead-acid maintenance free battery
UZB12.051
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
Wall mounting bracket
Type ZM1.UBC10 is under preparation, please consult PULS.
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
20/23
28. A
28.1. B
Batteries have a limited life time. They degrade slowly beginning from the production and need to be replaced
periodically. The design life figures can be found in the individual datasheets of the batteries and usually is specified
according to the Eurobat guideline or according to the manufacturer’s specifications.
The design life is the estimated life based on laboratory condition, and is quoted at 20°C using the manufacturer’s
recommended float voltage condition. According to the Eurobat guideline, design lives have been structured into the
following different groups:
3 - 5 years:
6 - 9 years: This group of batteries is usually used when an improved life is required.
10 - 12 years:
A battery failure within the specified design life of the battery usually results in a complete loss of the battery
function (broken cell, defect connection, …) and will be detected and reported by the periodical battery tests which
are included in the UBC10.241 DC-UPS control unit.
If the operational parameters differ from those which are specified for the design life, an earlier change of the
battery might be necessary. The “real life” is called service life and is defined as the point at which the cell’s actual
capacity has reached 80% of its nominal capacity. At the end of the service life the capacity degrades much faster, so
that a further use of the battery is not recommended.
Temperature effect:
The temperature has the most impact in the service life. The hotter the temperature, the earlier the wear-out phase
of the battery begins. The wear-out results in a degradation of battery capacity. See Fig. 28-1 for details.
Effect of discharging cycles
The number as well as the depth of discharging cycles is limited. A replacement of the battery might be necessary
earlier than the calculated service life if the battery exceeds the numbers and values of Fig. 28-2.
Other effects which shorten the service life
Guidelines for a long battery service life:
PPLICATION NOTES
ATTERY REPLACEMENT INTERVALS
This group of batteries is very popular in standby applications and in small emergency equipment.
This represents a 4 years design life with a production tolerance of ±1 year.
This represents a 7.5 years design life with a production tolerance of ±1.5 years.
This group of batteries is used when in applications where longest life and highest safety level are
required. This represents a 11 years design life with a production tolerance of ±1 year.
Overcharging and deep discharging shortens the service life and should be avoided. Thanks to the single
battery concept of the UBC10.241, the end-of-charge voltage is precisely set automatically avoiding
unnecessary aging effects.
Charge retention is important to get the longest battery life. Stored batteries which are not fully charged
age faster then charged batteries. Batteries which are not in use should be recharged at least once a year.
Excessive float charge ripple across the battery has an effect of reducing life and performance. The
UBC10.241 does not produce such a ripple voltage. This effect can be ignored when the battery is charged
with the UBC10.241.
Place the DC-UPS in a cool location: E.g. near the bottom of the control cabinet.
Do not place the DC-UPS near heat generating devices.
Do not store discharged batteries.
Do not discharge the battery more than necessary. Set buffer time limiter to the required buffer time.
The depth of discharge reduces the service life of the battery and limits the number of cycles. See Fig. 28-2.
U–Series
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
21/23
U–Series
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
Example for calculating the service life and the required replacement cycle:
Parameters for the example:
A 5Ah battery with a design life of 3-5 years is used (e.g. Yuasa battery which is used for type UZB12.051)
The average ambient temperature is 30°C
One buffer event consumes approx. 25% of the achievable buffer time.
One buffer event per day
Calculation:
Ambient temperature influence:
According to Fig. 28-1 curve A, a 2 years service life can be expected for an ambient temperature of 30°C.
Number of discharging cycles: 2 years * 365 cycles = 730cycles in 2 years.
According to Fig. 28-2, curve C has to be used (only 25% of battery capacity is required). 730 cycles have only a
negligible influence in a battery degradation and can be ignored.
Result:
The battery shall be replaced after 2 years.
Please note that the battery degrading begins from the production date (check date code on the battery) which may
shorten the replacement intervals.
Fig. 28-1
Service Life in Years
10
9
8
7
6
5
4
3
2
1
20°C
*) datasheet figures from battery manufacturer
Service life versus ambient
temperatures, typ *)
Design Life
of Battery
C
B
A
Ambient Temperature
30°C 35°C
25°C
A:
B:
C:
3-5 Years
6-9 Years
10-12 Years
40°C
45°C
Fig. 28-2
Cell capacity degradation vs. discharging
Cell Capacity
120%
100%
80%
60%
40%
20%
A
0
200
cycles *)
C
B
Depth of
discharge
A:
100%
B:
50%
C:
30%
Number of Discharging Cycles
400 600 800 1000 1200
28.2. P
ARALLEL AND SERIAL USE
Do not use the DC-UPS in parallel to increase the output power. However, two units of the DC-UPS can be paralleled
for 1+1 redundancy to gain a higher system reliability.
Do not use batteries in parallel, since the battery quality test might create an error message.
Do not connect two or more units in series for higher output voltages.
Do not connect two or more units in a row to get longer hold-up times.
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
22/23
U–Series
UBC10.241, UBC10.241-N1
24V, 10A, DC-UPS
28.3. U
SING THE INHIBIT INPUT
The inhibit input disables buffering. In normal mode, a static signal is required. In buffer mode, a pulse with a
minimum length of 250ms is required to stop buffering. The inhibit is stored and can be reset by cycling the input
voltage.
For service purposes, the inhibit input can also be used to connect a service switch. Therefore, the inhibit signal can
be supplied from the output of the DC-UPS.
Fig. 28-3
+-+
-
Output
Power
Supply
Input
PE
NL
Wiring example for inhibit input
-
+
+
-
IN
OUT
24V
DC-UPS
UBC10.241
Signal Port
24V
-
Inhibit
+
-
+
Buffered
Load
Service
Switch
28.4. T
ROUBLESHOOTING
The LEDs on the front of the unit and relay contacts indicate the status of the DC-UPS. Please see also chapter 14.
The following guidelines provide instructions for fixing the most common failures and problems. Always start with
the most likely and easiest-to-check condition. Some of the suggestions may require special safety precautions. See
notes in section 25 first.
“Check wiring” LED is on Check correct wiring between the battery and the DC-UPS
Check battery fuse. Is the battery fuse inserted or blown?
Check battery voltage (must be typically between 7.4V and 15.1V)
Check input voltage (must be typically between 22.8V and 30V)
Check battery polarity
DC-UPS did not buffer Inhibit input was set
Battery did not have enough time to be charged and is still below the deep discharge
protection limit.
DC-UPS stopped buffering Buffer time limiter stopped buffering Æ set buffer time limiter to a higher value
Deep discharge protection stopped buffering Æ allow sufficient time for charging
the battery
Output was overloaded or short circuit Æ reduce load
Output has shut down Cycle the input power to reset the DC-UPS
Let DC-UPS cool down, over temperature protection might have triggered.
DC-UPS constantly switches between normal mode and buffer mode
The supplying source on the input is too small and can not deliver sufficient current
Æ Use a larger power supply or reduce the output load
The input voltage is same as transfer threshold. Æ Increase input voltage
May. 2008 / Rev. 1.1 DS-UBC10.241-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
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