7
Installation Notes:
1)
A resistor may be wired remotely across the analog output terminals to convert analog
output current to a voltage. Use Ohm’s Law to calculate the proper resistance for the
desired voltage based upon the 1250B’s rated output current.
2)
Maximum analog output load resistance: 0-1mA = 10K ohms; +/-1mA = 10K ohms;
0-2mA = 5K ohms; 4-20mA = (See Table 3.1).
3)
Models with 4-20 mA analog output options must have an EXTERNAL LOOP POWER
SOURCE of 10.0 VDC minimum, 24.0 VDC maximum, in series with the current loop.
The INCON Model 1945 Power Supply is recommended for these installations.
(See Figure 1.3).
4)
When additional remote indication is needed, several 1250Bs may be wired in parallel to
the same transmitter, or the INCON RD-4 Remote Indicator can be used.
5)
The 1250B and the synchro transmitter MUST BE WIRED TO THE SAME AC
SOURCE. Do not remove the jumpers from terminals E and F.
6)
A provided jumper or keyswitch may be installed between terminals 3 & 4 to prevent the
program from being changed. When these terminals are jumpered the menu will read
“
EP
-x” instead of “
OP
-x”, which indicates that you can Examine each Parameter, but not
change them.
7)
After installation and programming, install the rear terminal guard with screws provided.
8)
Analog outputs of 0-1mA, +/-1mA, and 0-2mA can be changed in the field to any one of
the other two. Set the appropriate switches on Switch A and B per the table below. See
Table 1.4 and Figure 1.4
Table 1.4 Analog Output Switch Positions
Figure 1.4 Analog Switches &Trim-Pots
Model:
0
1
2
Switch A-1
OFF
ON
OFF
Switch A-2
OFF OFF OFF
Switch A-3
ON
OFF
OFF
Switch B-1
OFF
OFF
OFF
Switch B-2
ON
ON
ON
Switch B-3
ON
ON
ON