Alpha Technologies Micro Secure UPS - Manual (Page 45)

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017-220-J0 Rev B
A typical application of this timer controlled dry contact function is to control a traffic light. When the grid power
fails, the Alpha Micro Secure goes into the Inverter mode and continues supplying backup power to the traf-
fic light. Since the batteries supplying the backup power have limited capacity, a timer controlled dry contact
is usually configured to switch the traffic light into the flashing amber or flashing red mode after a user-defined
period to conserve battery power. This setup works fine during non rush hour traffic, but during rush hour, it may
be more desirable to keep the traffic light running normally for as long as backup power is available. To address
this issue, a new feature called the Time of Day Action has been added to deactivate the timer during a user
defined time period up to twice each day.
 Inverter
mode
entered
 Dry contact activates
when enabled timer
counts down to zero
 Timer starts to
count down
if enabled
Microprocessor
Real time clock
Peak period
settings
Disable Timer (Action=ON) or
Enable Timer (Action=OFF)
Figure 26 — Time Of Day Action Operation
You can define up to 2 peak time periods of the day:
1. Go to the UPS Maintenance > Relay & Load Shed screen.
2. In the Time of Day Action Configuration dialogue box, set up the start and end time of the first rush hour
under Time Period 1 and the second rush hour under Time Period 2. In this example, during the first time
period (7 AM to 9 AM), all 3 timers are disabled (they do not count down at all). Similarly, all timers are
disabled during the second time period (3 PM to 6 PM).
3. Select ON under each time period. Click the Update button under each time period to store the settings.
Confirm your settings in the UPS Monitoring > Relay & Load Shed > Time of Day Action Status screen.
Figure 27 — Time Of Day Configuration