C120-E161-03EN
119
D.3 Signal Line Configuration
D.3.2
Electrical specifications
lists the electrical specifications for the UPS interface.
l
Input circuit
Note:
Signal-line chatter must be 1 ms or less.
Table D.1 UPS interface signals
Signal name
Definitions
Pin number
Remarks
* BPS/* UALM Signal indicates faulty UPS conditions
6
* BTL
Signal provides a warning of a low battery
level and a pending UPS failure.
7
Enabled with ON
(Note1)
* ACOFF
Signal indicates power failure at the
commercial AC supply connector to the
UPS
9
Power failure: ON
Normal: OFF
(Note2)
SG
Signal ground
5
ER
Signal indicates the main unit is running
(Equipment Ready)
1
(Note3)
ON:
Indicates contacts are closed
OFF:
Indicates contacts are open
Note
1:
Use a UPS capable of normal battery power supply operation for at
least 10 to 60 seconds after this signal is turned on.
Note
2:
Use a UPS capable of normal battery power supply output without
turning on the *ACOFF in an instantaneous commercial AC power
failure lasting two seconds or less.
Note
3:
The OFF signal is used to designate that the UPS is not supplying
power.
Table D.2 Electrical specifications
Signal name
Input conditions
* BPS/* UALM
• No voltage relay contact
• Contact rating 12 VDC, 10 mA or more (maximum 0.5 A)
• Use of metallic contact, or lead relay is recommended.
* BTL
* ACOFF
