Nexen SC100 964420 - Manual (Page 12)

FORM NO. L-21163-C-0808 12
ADJUSTABLE EXCITATION VOLTAGE
The SC100 supplies an excitation voltage to sensors. This
excitation is bipolar and adjustable from ±5 to ±15 VDC.
It’s three lines can be used in any combination per the
sensor specifi cations.
1. Remove sensor excitation voltage connection.
2. Apply power to the SC100
3. Connect a voltmeter to terminals 11 (+) and 13 (-).
4. Adjust Vex until required excitation voltage is reached.
5. Reconnect sensor excitation voltage connection.
6. Recheck excitation voltage and adjust as necessary.
Set for Low or High Input Gain Range.
Figure 18
I
NPUT
R
ANGE
S
ELECTOR
Each input sensor channel can be set up with varying
gains. Gains are user selectable with CH1 GAIN and
CH2 GAIN switches accessible through the SC100
cover (See Figure 18).
For both Channel 1 and 2, LO GAIN has an overall
gain range of 5-120; HI GAIN has a gain range of
50-1200. To calculate, take the maximum output voltage
per channel divided by the maximum input voltage per
channel. If the result is less than 50, choose LO gain,
otherwise choose HI.
Example 1: Maximum output = 10V
Maximum input = 300mV
Gain = 33 => LO GAIN
Example 2: Maximum output = 10V
Maximum input = 50mV
Gain = 200 => HI GAIN
LO LO
HI
CH 2
GAIN
HI
CH 2
GAIN
High Low
Channel 2 Input
Channel 1 Input
LO LO
HI
CH 2
GAIN
HI
CH 2
GAIN
LO LO
HI
CH 2
GAIN
HI
CH 2
GAIN
LO LO
HI
CH 2
GAIN
HI
CH 2
GAIN
High Low
Sensor
MB Series (LVDT)
SW Series (Strain Gauge)
PH16
PH21
UH21
Excitation Volts
6 VDC
6 VDC
12 VDC
12 VDC
±15 VDC
Maximum Quantity
2
2
2
2
2
Table 1 Nexen Sensor Compatibility
Output Volts
0–400 mV
0–250 mV (1/2 bridge)
0–600 mV (full bridge)
0–350 mA
0–350 mA
0–200 mA