Vigilant MICROVAC, Owner'S Manual

Page: 25 / 36

Document: LT0109 Vigilant MICROVAC Owner's Manual
Installation, Wiring, Setup, and Commissioning
Issue 1.31 5 April 2000 Page 2-13
2.3.10 DISABLE MAINS AND CHARGER FAULT MONITORING
Switch 2:7 allows fault monitoring of the mains input and charger output to be disabled in the
case where MICROVAC is powered from a DC supply which is already fault monitored.
OFF : Normal, mains and charger fault monitoring is enabled.
ON : Mains and charger fault monitoring is disabled.
2.3.11 SPEECH IN MANUAL MODE
Switch 2:8 controls whether speech messages will occur with the EVACUATE tones (and
ALERT tones if configured) in MANUAL mode.
OFF : No speech in MANUAL mode. (Standard)
ON : Speech messages will occur in MANUAL mode.
2.4 COMMISSIONING
After MICROVAC is installed and wired as described above, and the DIP switches set as
desired the unit may be switched on and its operation tested.
2.4.1 POWERING UP
Provided the speaker and strobe load is not too high, MICROVAC may be mains powered in
the initial stages, with the batteries connected later. This will make it easier to switch the
power off and on as required. Note that the DIP switches are read only on power-up so if any
changes in the DIP switches are made, the power must be removed and re-applied.
Switch the keyswitch to the MANUAL position, liven the mains and switch the MICROVAC's
internal mains switch on. Check that the MAINS ON LED and the MANUAL LED turn on and
that no faults or alarms are displayed - if any are power down, check the wiring and rectify
the faults. Be sure to wait at least 40 seconds before deciding that no faults are present as
Speaker Line faults are suppressed for 40 seconds after power-up to allow the DC voltage
on the speaker capacitors to stabilise.
Checked ( )
2.4.2 CHECKING AND ADJUSTING THE CHARGER VOLTAGE
The battery charger is set in the factory for 27.3 volts at 20
°
C with a temperature coefficient
of -36mV /
°
C (i.e. at higher temperatures the voltage will be lower and lower temperatures
the voltage will be higher). This is satisfactory for the vast majority of sealed lead acid
batteries. To set the output voltage of the charger to some other voltage, adjust it with the
BATTERY VOLTAGE control, while measuring the voltage across the battery terminals J5
and J6. Be sure to allow for the temperature when setting the voltage. After adjusting the
charger voltage, the monitoring voltages must be adjusted in sympathy. To do this connect a
voltmeter between the test points labelled "Null Adjust" and adjust the BATTERY CHECK
control to give a zero reading.
(Note on a Microvac with a PSU2406 adjust the voltage with the 'Output Volts Adjust" control
in the PSU2406.)
Connect the battery and check the voltage is correct. If the battery is very heavily discharged
the voltage may be low for a time, and may even result in a Charger Low Fault being
displayed. After a few minutes, check that the voltage is 27.3V at 20
°
C or as adjusted.
Remember to allow for the temperature coefficient if the temperature is not 20
°
C.
Checked ( )