KEP SC-FI Operating Manual

SC-FI Series

Frequency to Current Signal Conditioner

http://www.kep.com

99483 10/9/98

KESSLER-ELLIS PRODUCTS

10 Industrial Way East
Eatontown, NJ 07724
800-631-2165 • 732-935-1320
Fax [phone]

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INDEX

DESCRIPTION ..................................................................................1

SPECIFICATIONS.............................................................................1

TYPICAL WIRING HOOKUP.............................................................1

INPUT & OUTPUT SETTINGS..........................................................2

"L" OPTION SPECIFICATIONS ........................................................3

"L" OPTION TYPICAL WIRING.........................................................3

"L" OPTION INPUT & OUTPUT SETTINGS .....................................4

DIMENSIONS....................................................................................5

WARRANTY ......................................................................................5

DECODING PART NUMBER ............................................................5

THIS PAGE IS BLANK

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 condi­tioning are provided, one for magnetic pickups and the other
being an isolated pulse input.

The amplified frequency signal is then converted to an ana­log 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 kΩ
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

SC-FI Signal Conditioner

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.

Typical Wiring Hookup
Magnetic Pickup Hookup

1• Magnetic pickup

Turbine Meter with

Mag Pickup

2• Magnetic pickup
3• Shield (common)
4• Opto-isolator In +
5• Opto-isolator In –

+

DC
POWER
SUPPLY

+

ANALOG

4-20 mA
DEVICE

–

6• Shield (common)
7• Output +
8• Output –
9• Do Not Use

–

High Level Pulse Hookup

Simplified Block Diagram

mV
nput

-30V

Input

+
–

10kΩ

10kΩ

3.3kΩ

V ref

F/V

Span

Zero

REED
SWITCH
PULSER

+

V/I

Loop Powered

4-20mA Output

–

+

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• Output +
8• Output –
9• Do Not Use

1

SC-FI Signal Conditioner

INPUT & OUTPUT SETTINGS

REMOVING THE CASE:

The case must be removed to change switch settings. To
remove the case procede as follows:

Refer to FIGURE 1. Using finger tips, carefully pry the
case away from the terminal blocks (as shown with
dotted lines).

Pry far enough to release the restraining clips on both
sides of the case.

Press up on terminal block with thumbs. The assembly
will pop out allowing it to be removed from case.

FIGURE 1:

4 5 6

1 2 3

OUTPUT ADJUSTMENTS:

The unit has two potentiometers for adjustment. The upper
potentiometer controls the 20mA setpoint and the lower
potentiometer controls the 4mA setpoint (see Figure 2). The
4mA output range can be adjusted from 3mA to 5mA. The
20mA output range can be trimmed from 50% to 100% of
the selected range. To adjust the output, initially turn the
20ma adjust 20 turns CW for starting position. Input 0
frequency and adjust the 4 mA pot. Connect your maximum
frequency and adjust the 20 mA pot.

FIGURE 2:

4 5 6

1 2 3

20 mA Adjust
(CCW-Up, CW-Down)

4 mA Adjust
(CCW-Down, CW-Up)

LED
INDICATOR

7 8 9

INPUT FREQUENCY RANGE SETTINGS:

The appropriate range is selected by turning “ON” the corre­sponding switch.

Range: Switch # “ON”
0-150Hz 1

0-300Hz 2
0-600Hz 3
0-1200Hz 4*
0-2500Hz 5
0-5000Hz 6
0-10000Hz 7

* Factory Default. The unit is setup at the factory for the
range 0-1000Hz.

7 8 9

RESPONSE TIME SETTING:

Switch #8 controls the output response time.

Switch #8 Response Time

OFF 0.1 second

ON 1 second

Turn switch #8 ON to provide damping of the output result­ing in a 1 second response time.

LED INDICATOR:

The SC-FI has a LED which indicates the status of the unit.
The table below describes the 3 states for the LED.

LED STATUS: MEANING:
OFF The unit is off.
ON (constant) The unit is loop powered.
BLINKING The unit is receiving an input fre-

quency. The LED will blink at a rate
proportional to the input frequency.
(The LED may appear to be constant
at high input frequencies)

2

"L" Option SPECIFICATIONS

SC-FI Signal Conditioner

Description:

The SC-FI with option "L" 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 SC-FI with option "L" is intended for use with lower full scale
input frequencies. Full scale frequencies of 15 Hz to 2000 Hz are
possible. The unit includes both a contact closure input and an
opto-isolated input. Output response time is selectable 1 or 10
seconds.

The amplified frequency signal is then converted to an analog
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

Contact Closure Input

Sensor Compatibility- Requires an isolated, contact closure
Maximum Contact Voltage- 5 V
Maximum Contact Current- 0.12 mA
Nominal Pullup Resistance - 47 Kohm to 5 Vdc

Frequency Range - 0-100 Hz

Frequency to Current Conversion

Range Selection: DIP Switch Selectable
Available Ranges: 30 Hz, 60 Hz, 120 Hz, 240 Hz,

480 Hz, 960 Hz, 1920 Hz

Factory Default: 100 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: 1 second (10 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.

Typical Wiring Hookup (option "L")
Contact Closure Hookup

Flowmeter with

Switch Closure Output

1• Not Used
2• Contact Closure In
3• Shield (common)
4• Opto-isolator In +
5• Opto-isolator In –

+

DC
POWER
SUPPLY

+

ANALOG

4-20 mA
DEVICE

–

6• Shield (common)
7• Output +
8• Output –
9• Do Not Use

–

High Level Pulse Hookup

Simplified Block Diagram

+5V

47kΩ

Contact
Closure

Input

3-30V

Input

–
+

3.3kΩ

V ref

F/V

Span

Zero

REED
SWITCH
PULSER

+

V/I

Loop Powered

4-20mA Output

–

+

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• Output +
8• Output –
9• Do Not Use

3

SC-FI Signal Conditioner

"L" Option INPUT & OUTPUT SETTINGS

REMOVING THE CASE:

The case must be removed to change switch settings. To
remove the case procede as follows:

Refer to FIGURE 1. Using finger tips, carefully pry the
case away from the terminal blocks (as shown with
dotted lines).

Pry far enough to release the restraining clips on both
sides of the case.

Press up on terminal block with thumbs. The assembly
will pop out allowing it to be removed from case.

FIGURE 1:

4 5 6

1 2 3

OUTPUT ADJUSTMENTS:

The unit has two potentiometers for adjustment. The upper
potentiometer controls the 20mA setpoint and the lower
potentiometer controls the 4mA setpoint (see Figure 2). The
4mA output range can be adjusted from 3mA to 5mA. The
20mA output range can be trimmed from 50% to 100% of
the selected range. To adjust the output, initially turn the
20ma adjust 20 turns CW for starting position. Input 0
frequency and adjust the 4 mA pot. Connect your maximum
frequency and adjust the 20 mA pot.

FIGURE 2:

4 5 6

1 2 3

20 mA Adjust
(CCW-Up, CW-Down)

4 mA Adjust
(CCW-Down, CW-Up)

LED
INDICATOR

7 8 9

INPUT FREQUENCY RANGE SETTINGS:

The appropriate range is selected by turning “ON” the corre­sponding switch.

Range: Switch # “ON”
0-30Hz 1

0-60Hz 2
0-120Hz 3*
0-240Hz 4
0-480Hz 5
0-960Hz 6
0-1920Hz 7

* Factory Default. The unit is setup at the factory for the
range 0-100Hz.

7 8 9

RESPONSE TIME SETTING:

Switch #8 controls the output response time.

Switch #8 Response Time

OFF 1 second

ON 10 second

Turn switch #8 ON to provide damping of the output result­ing in a 10 second response time.

LED INDICATOR:

The MS660 has a LED which indicates the status of the
unit. The table below describes the 3 states for the LED.

LED STATUS: MEANING:
OFF The unit is off.
ON (constant) The unit is loop powered.
BLINKING The unit is receiving an input fre-

quency. The LED will blink at a rate
proportional to the input frequency.
(The LED may appear to be constant
at high input frequencies)

4

Dimensions

SC-FI Signal Conditioner

DIN Rail Mount

WARRANTY

This product is warranted against defects in
materials and workmanship for a period of two
(2) years from the date of shipment to Buyer.

.89

(22.5)

Mounting holes molded
directly under cover screws.
Max. screw head .29"
(Typ. 4 places)

4.21

(107)

PANEL INSTALLED

1.40 (35.5)

2.95 (75)

NEMA4X

To access terminals, remove

4.21

(107)

4.92

(125)

TOP VIEW

cover and 4 panel screws.

4.92

(125)

.43

(11)

Explosion Proof Enclosure

3/4” NPT (2) HLS.
(feed thru hubs)

.18 (5)

SIDE VIEW

3.88 (98.5)

2.95
(75)

1.93
(49)

The Warranty is limited to repair or replace­ment of the defective unit at the option of the
manufacturer. This warranty is void if the prod­uct has been altered, misused, dismantled, or
otherwise abused.

ALL OTHER WARRANTIES, EXPRESSED
OR IMPLIED, ARE EXCLUDED, INCLUDING
BUT NOT LIMITED TO THE IMPLIED WAR­RANTIES OF MERCHANTABILITY AND FIT­NESS FOR A PARTICULAR PURPOSE.

Kessler - Ellis Products Co.

10 Industrial Way East

Eatontown, NJ 07724

(732) 935 - 1320

Toll Free 800 - 631 - 2165

Fax (732) - 935 - 9344

http://www.kep.com

5.06

(129)

7.125
(181)

5.44

(138)

4.06

(103.2)

2 MTG LUGS

0.31 DIA.

Decoding Part Number
Example SC-FI D ET
Series

FI= Frequency to Current

Mounting:

B= Nema 4X
C= Explosion Proof
D= DIN Rail

Options:

ET= Extended Temp (-20° to 85° C)
L = Low Count Speed for Contact Closure Inputs
50 = 10-50 mA output

Accessories: (add to end of part number)

DR-4= 4" DIN Rail

5