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EPS Stromversorgung GmbH
Alter Postweg 101 • 86159 Augsburg
Germany
Fon: +49 821 / 570451-0
Fax: +49 821 / 570451-25
www.eps-germany.de
PSB 9000 3U Slave Series
3.7
Alarms and monitoring
3.7.1
Definition of terms
The device signalises alarms (see
) such as overvoltage (OV) or overheating (OT) via the
front LED “Error” and as readable status via digital interface. When running the device as Slave as part of a master-
slave system, the alarm is also reported to the master and if the master is with display, the alarm is indicated there
as well. Basically, device alarms will switch off the DC terminal, primarily in order to protect the connected load or
external source, and only secondarily to protect the device itself.
Monitoring or supervision is also available in form of user-definable events. Configuration of alarm thresholds and
events, as well as reading status can only be done via the USB ports.
3.7.2 Device alarm and event handling
A device alarm incident will usually lead to DC terminal switch-off and the front LED “Error” is lit to make the user
aware. Some alarms must be acknowledged. While the Slave device is in control of a master device, all alarms
are acknowledged on the master unit. Refer to the user manual of the master. After acknowledging the alarm on
the master, the LED “Error” on the alarm causing slave unit should be off.
For all other situations, the front button “On / Off” or a specific command sent via digital interface in remote control
is used to acknowledge alarms.
►
How to acknowledge an alarm (during manual control)
1.
In case the DC terminal is switched off and the LED “Error” is lit, use button “On / Off”.
2.
The LED should go off and with another push on “On / Off”, the DC terminal could be switched on again. If
the LED remains lit, the alarm cause could still be present.
Some device alarms, specifically their thresholds, are configurable via
EPS
Power Control
software or custom tools:
Short Long
Description
Range
OVP
O
ver
V
oltage
P
rotection
Triggers an alarm if the voltage on the DC terminal reaches the defined
threshold. The DC terminal will be switched off.
0 V...1.1*U
Nom
OCP
O
ver
C
urrent
P
rotection
Triggers an alarm if the current in the DC terminal reaches the defined
threshold. The DC terminal will be switched off.
0 A...1.1*I
Nom
OPP
O
ver
P
ower
P
rotection
Triggers an alarm if the output or input power reaches the defined threshold.
The DC terminal will be switched off.
0 W...1.1*P
Nom
These device alarms can’t be configured and are based on hardware:
Short Long
Description
PF
P
ower
F
ail
AC supply over- or undervoltage. Triggers an alarm if the AC supply is out of specification
or when the device is cut from supply, for example when switching it off with the power
switch. The DC terminal will be switched off.
OT
O
ver
Tem-
perature
Triggers an alarm if the internal temperature reaches a certain limit. The DC terminal will
be switched off.
MSP
M
aster-
S
lave
P
rotection
Triggers an alarm if the master unit loses contact to any slave unit or vice versa. The DC
terminal will be switched off. The alarm can be cleared by reinitialising the MS system.
Safety
OVP
Safety
O
ver
V
oltage
P
rotection
Only featured in the 60 V model:
Triggers a special OVP alarm if the voltage on the DC terminal exceeds the rigid threshold
of 101% rated voltage. The DC terminal will be switched off. For details refer to section
