Manual Energy Storage Inverter ESI-S
Electrical design and installation 69
Note: Contacts drawn in non-alarm position
24 Vdc
external
supply
NO Alarm
contact of
master 1
NO Alarm
contact of
master 2
External
digital
input
+
-
Figure 54: Cabling of the alarm status of a multi-unit inverter consisting of masters only, using
the NO alarm contact on each inverter.
In the
above, the external input will be low if:
−
Both master units are in alarm OR
−
The external 24 V power supply fails OR
−
Both inverter units are disconnected from the supply
2. A second method to implement alarm functionality is to use the ESI-Manager’s
programmable digital output contacts. Use this approach when the condition for
alarm is uniquely defined, e.g. an alarm has to be given only when the inverter trips
due to an unacceptably high network voltage or when the inverter trips due to a well-
defined internal error. In that case the desired function can be assigned to a
programmable alarm which can be monitored be assigned to a digital output.
This type of alarm has to be cabled on the 8 pin terminal block situated at the top
right corner when looking at the ESI-Manager from the rear (Cf.
The digital output contacts have a common point (cabled on contacts 1 and 2) and are
of the NO-type (normally open). The contact ratings are:
−
Maximum continuous ac rating: 440 Vac/1.5 A
−
Maximum continuous dc rating: 110 Vdc/0.3A
−
The common is rated at 9 A/terminal, giving a total of 18 A
−
When using a power supply of 24Vdc, a minimum current of 10 mA should be
drawn by the circuit connected to the digital output contact
shows the status of a digital output contact configured as alarm contact for
different operation modes of the inverter.
Table 26: Status of a digital output contact configured
as alarm contact for different inverter operation modes
Inverter state
Normally open digital contact state
Disconnected from the supply
Open
Inverter (auxiliaries) connected
to the supply, no error present
Open