Raco Verbatim, Owner'S Manual

Page: 95 / 246

Analog Signal Input
Verbatim Owner's Manual B-1
B
Analog Signal Input
B.1 Analog Connections
Refer to the diagram (page B-10) showing the VAN analog boards for
connection of analog inputs.
Be sure you follow the indicated positive and
negative polarity indications, except in the case of TS705 temperature sensor
inputs, for which positive and negative polarity does not matter. Two signal
wires are required for each input. The terminal blocks can be unplugged for
convenience. Because of the space constraints, it is best to use small gauge
wire like telephone wire. If bulkier wire is needed outside the dialer, it is best
to install a terminal strip outside the dialer to make the transition from the
bulkier wire to the more compact wiring going into the analog input connection
points.
Note:
Take care to route the incoming signal wires to one side of the enclosure or
the other so that they do not interfere with the front panel circuit board when
the unit’s door is closed. Also, try to route the analog signal wires away from
power wiring to minimize noise pickup.
B.1.1 Programming for Analog Channels
Each analog input will need to be programmed to specify:
1. The analog Input Signal Type (if other than standard 4-20 ma input).
2. The numerical value to be spoken at a corresponding minimum signal
level.
3. The numerical value to be spoken at a corresponding maximum signal
level. Items 2 and 3 amount to programming the translating scaling
factors for each analog input.
4. In many cases you will also want to program high and low setpoint limits
for each analog input.
5. You may also elect to replace the generic default voice message with your
own recorded messages for any analog channel, as described in section 4.