Figure FF:
illustrates the operation of the contacts. All the status contacts are normally
open and close when the condition they describe are true. For example, when the battery
is supplying the load, pin 9 is shorted to pin 5.
8 =
System normal
6 =
“
ABNORMAL
operation
9 =
Battery supplying load
7 =
Low battery
5 = Common
Figure FF: Computer interface pin out diagram
The following table summarizes the electrical ratings of the contacts:
Table G: Dry contact ratings
Parameter Rating
Rated voltage
240VAC/300VDC
Rated current (continuous)
5A
Max. switching load (AC)
2000VA
Max. switching load (DC)
8A for VDC<35V
50 watts for 300V>VDC>35V
4.1.4 REMOTE UPS POWER OFF
The UPS is provided with terminals allowing the installation of an external Emergency
Power Off (EPO) switch in addition to the switch on the front panel. A normally closed
switch must be used. The EPO becomes active when this switch opens (normally closed
contact).
To install the Remote EPO switch while the unit is running:
1. Put the unit in bypass mode (see
Section 2.5
).
2. Remove the jumper from the terminal.
3. Connect a normally closed switch to the terminals.
4. Make sure that the switch is closed! If the switch is open, the UPS will drop the
load upon return from bypass!
5. Follow the return from bypass procedure (see Section 2.6).
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