GAI-Tronics ICS Hazardous Area Page/Party Stations - Manual (Page 16)

Pub. 42004-723L2G
ICS Hazardous Area Page/Party
®
Station Page 14 of 31
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SmartSeries VLC Level
When activated, the VLC overrides the ALS minimum level setting allowing the speaker volume to
change to a preset level during an emergency page. To adjust the VLC Level, force the station into the
VLC mode by having someone execute a page from a station programmed by the MCU to activate the
VLC function. During the page, turn the R91 control fully counterclockwise, and listen for two beep
tones through the page speaker indicating the VLC Adjustment mode has been activated. After the two
beep tones, turn the R91 control to the desired speaker level using the live paging signal to adjust the
level. The station automatically exits the VLC Adjustment mode and reverts to normal operation 5
seconds after the last pot adjustment.
N OTE : The system must be equipped with an ADVANCE head end to activate the VLC function.
Speaker Impedance Supervision
When this feature is configured, the station will supervise the speaker line for changes in the speaker line
impedance. To perform this function the station must be calibrated for the impedance of the speaker(s)
attached. If the station has never been previously calibrated, the station will report a speaker fault within
15 minutes of being configured for this feature. The station may be calibrated either “locally” at the
station or “remotely” by a system command from the ADVANCE head end. See the ADVANCE System
Programming Manual for details of “remote” calibration.
To perform a “local” calibration, first ensure that the station is configured for speaker impedance
supervision. Next, set the station's address to 0x02. Wait until you hear a single-beep tone at the attached
speaker. This should occur within 20 seconds. This tone indicates that a successful calibration was
performed.
If instead a double-beep tone is heard, this indicates that the station attempted to calibrate but was
unsuccessful (the attached impedance is out-of-range). If a tone is not heard, the station may not be
configured for speaker impedance supervision or there is an open connection to the speaker.
After hearing the single beep tone, set the address back to its original value to resume normal station
operation with the new calibration value.
NOTE: If this feature is used, then jumper P9 of the Main PCBA must be in the HI (default) position.