P
ULSE
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OWER
&
MEASUREMENT LTD
4
1
Introduction
The
ViaLiteHD
Summary alarm module is used to monitor
ViaLiteHD
equipment fitted in the same rack. It is able to report alarms by front
panel visual indication, audio alarm and by status of it’s on board relays. There are two form C relays, both accessible at the rear of the
module; one relay is also routed to the cabinet backplane.
The summary alarm module maybe configured, so that it
’s on board processor automatically senses and alarm only active module; or it may
be configured via manual DIP switches both monitoring and controlling modules
The module has an on board resistive load, this can be configured via DIP switches to ensure the power supplies meet their minimum load
requirement. See your
ViaLiteHD
Rack Handbook for more details.
Internal architecture
Key features are:
The CPU monitors all rack alarm outputs
Compatible with either 1U or 3U rack
The CPU controls all module outputs
The module fits in
ViaLiteHD
rack chassis 7HP slot,
o
In a 1U HRK1 rack it fits in slot 3
o
In a 3U HRK3 rack it fits in slot 14
DIP switches available for manual alarm screening, slots 1-13 and slots 15,16
I2C bus is used at start up to monitor active slots for automatic alarm masking
Two dry contact relays, both accessible on module rear connector, one wired in parallel to the rack chassis connector
Front panel LED indication of rack summary status.
Front panel buzzer, giving audio alarm when fault is active
Front panel ACKNOWLEDGE switch
Different indication for active ALARM and acknowledged ALARM
The DC input power feed (+12 volts) is protected by a set resetable fuse.
The internal 5V is generated by linear regulator
PSU
DIP
switch
bank
CPU
Load
4 * 3W
Mute
switch
Buzzer
LEDs
I2C
Relay1
Relay2
Alarm
inputs
NO
COM
NC
NO
COM
NC
NO
COM
NC
MS_X
I2C
15
Alarm_X
13
B
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