KEP SC-FI Series, User Manual

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SC-FI Signal Conditioner
1
Description:
The SC-FI is a two wire frequency to analog converter that
converts a pulse rate input into a 4-20 mA output signal
proportional to frequency or rate.
The input pulse rate is amplified and filtered by the input
signal conditioning circuitry. Two forms of input signal condi-
tioning are provided, one for magnetic pickups and the other
being an isolated pulse input.
The amplified frequency signal is then converted to an ana-
log signal using a precision frequency to analog converter.
The output stage derives it’s power from the output current
loop. The output stage converts the input signal into the
desired output range. Multi-turn potentiometers provide for
the necessary trimming of span and zero.
SPECIFICATIONS:
Operating Temperature
32
°
F (0
°
C) to 158
°
F (70
°
C)
High Level Pulse Input
Type: Opto-Isolated
Logic 1: 4-30 VDC
Logic 0: 0-1 VDC
Frequency Range: 0-10 kHz
Fault Protection:
Reverse Polarity Protection
Over Voltage Protection
Isolation Voltage: 500 V
Fast Transient Immunity: 500 V
Maximum Rise Time: No Limit
Maximum Fall Time: No Limit
Magnetic Pickup Input
Differential Input
Input Impedance: 10 k
Ω
Frequency Response: 0-3500 Hz
Trigger Sensitivity: 30 mV p-p
Over Voltage Protection:
±
30 VDC
Frequency to Current Conversion
Range Selection: DIP Switch Selectable
Available Ranges:
150 Hz, 300 Hz, 600 Hz, 1200 Hz,
2500 Hz, 5000 Hz, 10,000 Hz
Factory Default: 1000 Hz
Analog Output
Accuracy:
±
0.1% Span (@ 20
°
C)
Output Type: Two Wire, Loop Powered
Range: 4-20 mA (10 - 50 mA optional)
Compliance Voltage: 10 to 40 VDC
Loop Burden: < 10 VDC (less than 500
Ω
)
Trim Controls: Zero & Span, non-interacting
Span (20 mA) Trim Range: 50% to 100% of full scale
Linearity: <
±
0.1% Span
Output Voltage Effect: <
±
0.002% Span/Volt
Temperature Effect: < 200 PPM/C
°
Reverse Polarity Protected
Noise Content: < 0.2% Span
Response Time: 0.1 second (1 sec. jumper selectable)
Over-current Limiting: 35 mA
Output Loop Indicator:
LED illuminates when output loop is
powered by proper polarity and blinks
proportionally to the input frequency.
Mounting Styles
DIN Rail Mount: Plastic enclosure with a snap fastener for
fitting to DIN 46 277 and DIN EN 50 022
assembly rails.
NEMA 4X: 4.92" x 4.92" NEMA 4X Enclosure for wall
mounting.
Explosion Proof: Aluminum enclosure for:
Class I, Division 1, Groups B, C & D
Class II, Division I, Groups E, F & G.
Simplified Block Diagram
F/V
V ref
Span
Zero
+
–
mV
Input
3-30V
Input
Loop Powered
4-20mA Output
+
–
V/I
3.3k
Ω
10k
Ω
10k
Ω
Typical Wiring Hookup
1• Magnetic pickup
2• Magnetic pickup
3• Shield (common)
4• Opto-isolator In +
5• Opto-isolator In –
6• Shield (common)
7•
8• Output –
9• Do Not Use
REED
SWITCH
PULSER
DC
POWER
SUPPLY
ANALOG
4-20 mA
DEVICE
+
–
+
–
1• Magnetic pickup
2• Magnetic pickup
3• Shield (common)
4• Opto-isolator In +
5• Opto-isolator In –
6• Shield (common)
7•
8• Output –
9• Do Not Use
DC
POWER
SUPPLY
ANALOG
4-20 mA
DEVICE
+
–
+
–
Turbine Meter with
Mag Pickup
Magnetic Pickup Hookup
High Level Pulse Hookup