
-
15
-
HT33 Series User Manual
J4 is the input port for remote EPO. It requires shorting NC and +24v during normal operation, and
the EPO is triggered when opening NC and +24v, or shorting NO and +24v. The port diagram is shown in
Fig 2-8, and port description is shown in table 2-3.
J4
E
P
O
_
N
C
+
2
4
V
E
P
O
_
N
O
+24V
Fig 2-8 Diagram of input port for remote EPO
Table 2-3 Description of input port for remote EPO
Position
Name
Purpose
J4.1
EPO_NC
EPO is activated when disconnecting fromJ4.2
J4.2
+
24V
+24V, connect the common terminal of NC and NO
J4.3
EPO_NO
EPO is activated when shorting with J4.2
The EPO is triggered when shorting pin 2 and 3 or opening pin 2 and 1 of J4.
If an external emergency stop facility is required, it is connected via the reserved terminals of
J10.The external emergency stop facility needs to use shielded cables to connect to the `normally
open/closed remote stop switch between these two pins. If this facility is not used, then pin 3 and pin 4 of
J4 must be open, or pin 1 and pin 2 of J4 must be shorted.
Note
1. The emergency stop action within the UPS will shut down the rectifier, inverter and static bypass.
However, it does not internally disconnect the mains input power supply. To disconnect ALL power to
the UPS, open the upstream input circuit breaker(s) when the EPO is activated.
2. Pin 1 and 2 of J4 have been shorted before the UPS is delivered
2.6.3 Generator Input Dry Contact (Optional)
J5 is status interface for generator connection. Connect pin 2 of J5 with + 24V power supply, and it
indicates that the generator has been connected with the system. The interface diagram is shown in fig
2-9 and interface description is shown in table 2-4