Alpha Technologies Micro, Micro XL, Micro XL3 UPS - Manual (Page 12)

017-237-B0 Rev A 10
8 Battery Temp Sensor
The Battery Temp connector attaches the battery temperature sensor to the Alpha Micro to monitor the battery
temperature. The charging voltage is temperature dependant. The Alpha Micro’s microprocessor adjusts the
charging voltage for optimum charging.
The sensor MUST be attached to the Alpha Micro for normal operation. Firmly attach the sensor end to the centre
battery’s case with high-strength flameproof tape such as duct tape as shown in “Wiring the External Batteries”
section. If the sensor isn't attached, a “Temperature Probe Unplugged” alarm will appear on the LCD.
9
User Input C7
This optically isolated input lets you attach an external switch panel for remote control of the Alpha Micro.
• 19 (S1): Shorting this contact to 22 (C) starts the Alpha Micro’s self test.
• 20 (S2): Shorting this contact to 22 (C) activates an alarm.
• 21 (S3): Shorting this contact to 22 (C) disables the AC output. There is no AC output power, the LCD
display shows “SHUTDOWN”, but the Alpha Micro is still energized. A manual restart is required to put the
Alpha Micro back to normal operation.
• 22 (C): Isolated return for contacts S1, S2 and S3.
USER INPUT
C7
19
S1 S2 S3 C
20 21 22
Figure 4 — User Input Layout
10
ATS C8
When the Alpha Micro is in Inverter mode, the normally open relay closes (Figure 5), sending 48 VDC or 24 VDC
from the batteries to this dry contact.
This contact can be used to power any external logic circuits or loads when the Alpha Micro is in Inverter mode.
Figure 5 — ATS Contact
Microprocessor
+
48VDC or 24VDC
from the batteries