11
Microprocessor
48Vdc from the
external batteries
Optically isolated user inputs C7 and contacts C8
The optically isolated user inputs are used to attach an external switch panel for remote control of
the Alpha FXM or to allow the Alpha FXM to control optional Alpha Off-Line Automatic Transfer
Switch (ATS).
User Input (C7): This relay has three contacts that are used to control the Alpha FXM:
19 (S1):
Shorting this contact starts the Alpha FXM self test. See "UPS Maintenance > Battery" on
page 38.
20 (S2):
Shorting this contact activates an alarm. See "UPS Maintenance > User Input" on page
46.
21 (S3):
Shorting this contact disables the AC output. There is no AC output power, but the Alpha
FXM is still energized. A manual restart is required to put the Alpha FXM back to normal
operation.
22 (C):
Isolated return for contacts S1, S2 and S3.
Figure 4 — User Input Layout
ATS (C8):
When the Alpha FXM is in the Inverter mode, this normally open relay closes sending
48 Vdc (FXM 650-48, 1100, 2000) or 24 Vdc (FXM 650-24) from the external batteries to this dry
contact (Figure 5). If the op- tional Alpha Off-Line Automatic Transfer Switch (ATS) is connected, it
will cause the ATS to switch the load from line power to the Alpha FXM battery backup power.
Figure 5 — ATS Layout
Status and Alarm LEDs Status:
Green LED solidly illuminated: the Alpha FXM is in Line mode and line power is provided to the
load. Green LED flashing: the unit is in Inverter mode and backup battery power is provided to the
load.
Alarm:
Red LED solidly illuminated: fault in the Alpha FXM. (See "Table Q — Fault Submenu" on page
79.) Red LED flashing indicates an alarm. (See "Table P — Alarm Submenu" on page 78.)
19
S1: Self Test
20
S2: Alarm
21
S3: Shutdown
22
Common
48Vdc from the
external batteries
+
Contact C8
23
24
Page
9
to
95
10
