22 (C):
Isolated return for contacts S1, S2 and S3. It is locat-
ed on contact C8 (#22).
Contact C7
Contact C8
19
S1:Self Test
20
S2:Alarm
21
S3:Shutdown
22
Commo
n
Figure 3 .7- User Input Layout
•
ATS (C8):
When the FXM is in Inverter mode, this nor-
mally open relay closes (Figure 3.8), sending 48 VDC
(FXM 650-48, 1100, 2000) or 24 VDC (FXM 650-24)
from the external batteries to this dry contact. If the
optional Alpha Technologies’s Automatic Transfer Switch
(ATS) is connected, it will cause the ATS to switch the
load from line power to the FXM’s battery backup power.
48VDC or 24VDC from
the external batteries
Contact C8
Microprocessor
23
24
+
Figure 3 .8 ATS Layout
11
Status and Alarm LEDs
•
Status:
When this green LED is on, the FXM is in Line
mode and line power is provided to the load. When it is
flashing, it is in Inverter mode and backup battery power
is provided to the load.
•
Alarm:
When this red LED is on, the FXM has a fault.
When it is flashing, it has an alarm (
See
“Troubleshoot-
ing” on page 87).
18
FXM UPS Operator's Manual
Doc# 017-201-B0 Rev 0408
7