NEMA 4 Enclosure
is rugged, watertight
and tamper resistant
Backlit LED Display
shows set point, process
variable, process deviation
from set point or calibrate
high or low as selected by
display mode switch
Response Speed
Adjustment
sets the duration and
frequency of air pulses
controlling speed of
response
Pneumatic Output
sends air to control valve
up to maximum air input
AC Power Input
is 115/230 VAC, 50/60
Hz, switch selectable
Optional Remote Control and
Remote Set Point Modules
can be mounted up to
1000 feet away
EPC-1
Electro-
Pneumatic
Controller
Accepts 4-20 mA Signal
Accuracy to ±0.5% of Span
Display Mode Switch
selects set point, process
variable, process deviation
from set point or calibrate
high or low for display
Set Point Adjustment
establishes process set point
Dead Band Adjustment
for hysteresis to balance
system accuracy with
valve wear
Pneumatic Input
uses standard plant air
up to 100 psig maximum
Electrical Signal Input
is 4-20 mA or from RTD
with optional signal
conditioning card
Intrinsically Safe Option
Factory Mutual Approved
for hazardous locations
Applications
●
Process Control Systems●HVAC Systems
●
Water Purification Systems ●Vaporizers
●
Metal Cleaning Systems●Plating Systems
●
Feed Water & Fuel System ●Pressure Control
Controls in Boiler Rooms
- 185 -
EPC FEATURES
O
NE BOX REPLACES I/P TRANSDUCERS,
P
OSITIONERS AND EXTERNAL POWER SUPPLIES
Conventional Pneumatic Control System
Spence EPC-1 Electro-pneumatic Control System
INSTRUMENT AIR
6O PSIG
3-15 PSIG
EPC
PLANT AIR
60
PSIG
2O PSIG
PNEUMATIC CONTROLLER
- 186 -
EPC-1 ELECTRO-PNEU-
MATIC CONTROLLER
EPC-1 ELECTRO-PNEUMATIC CONTROLLER
APPLICA TION DATA
●Control of E8, Kombat Series K, Intimidator Type J, Boss Type
D, Doctor Type MD and other manufacturer’s control valves
●Process Control Systems
●HVAC Systems
●Packaged Systems such as Water Purification, Vaporizers,
Metal Cleaning, Plating, etc.
●Feed Water and Fuel System Controls in Boiler Rooms
●Ideal for Pressure Control
APPLICABLE CODES
NEMA 4 Enclosure
EPC-1
ELECTRO-PNEUMATIC
CONTROLLER
●Simplified Installation eliminates need for
Positioner, I/P, External Power Supply &
Instrument Quality Air
●No Air Consumption at Steady State
●Air Output 0 to Maximum Supply Pressure
●Loss of Power Reset
●Accuracy to ±0.5% of Span
●Easy to Read Digital Display
●Internal Power Supply for Transmitter
OPTIONS
●TSC—Temperature Signal Conditioning Card (for RTD
without transmitter)
●LCM-90—Local Control Module (where distance between
valve & EPC exceeds 60")
●EPC-RS—Remote Set Point Module
●Pressure Transmitter
●RTD Thermometer
●Differential Pressure Transmitter
●Thermowell
MODELS
EPC-1—Electro-Pneumatic Controller
EPC-1M—For Actuators over 60 square inch or Dual 36
Applications
EPC-1H—For Dual 60 square inch Actuators
J VALVE
PNEUMATIC
POSITIONER
PRESSURE
TRANSMITTER
4-20 mA
J VALVE
SPENCE EPC SIMPLIFIES YOUR CONTROL SYSTEM
- 187 -
EPC-1 ELECTRO-PNEU-
MATIC CONTROLLER
EPC-1
ELECTRO-PNEUMATIC
CONTROLLER
SPECIFICATION
EPC-1 AND EPC/IS SERIES
Controllers shall be electro-pneumatic, accepting an input signal
of 4 to 20 mA or RTD input and providing an output of 0-100 psig
capable of modulating diaphragm or cylinder actuators without
the use of valve positioners or I/P transducers. Controllers shall
be capable of operating on 115/230 VAC, 50/60 Hz or 24 VDC
supply and provided with a minimum 31⁄2 inch digital display
indicating set point, process variable, deviation from set point and
high/low calibration values.
Controllers shall be capable of direct or reverse action and
provided with external AUTO/MANUAL switch. Controllers shall
have no steady-state air consumption and be capable of accepting
a 100 psig input without the use of regulators. Accuracy shall be
±0.5% of span, gain shall be adjustable, dead band shall be
adjustable 0–5% of span and controllers shall be provided with
an adjustable derivative function.
Enclosures shall be NEMA 1, 2, 3, 3S, 4, 4X, 12 and 13 rated and
provided with a hinged cover. Controllers shall be CSA-Approved,
FM-Approved for intrinsic safety.
Controllers shall be Spence Engineering or approved equivalent.
EPC/RCS-90 AND EPC/RCS-90/IS
A control module shall be provided to be mounted at or near the
valve which will enable the controller to be mounted up to 1000
feet away and linked to the module by only electrical connections.
Enclosure shall be NEMA 1, 2, 3, 3S, 4, 4X, 12 and 13 rated. The
local control module shall be CSA-Approved, FM-Approved for
intrinsic safety.
EPC/RS MODULE
The remote set point module shall consist of a 1⁄4 DIN, NEMA 1
panel mount enclosure designed to be mounted up to 1000 feet
away from the controller. Enclosure shall be provided with a clear,
hinged cover equipped with a lock and two keys. Modules shall
be provided with all necessary panel mount hardware and plugin terminal connector. Modules shall have a minimum 31⁄2 inch
digit backlit LCD display with 1⁄2 inch high characters. Display
shall indicate high-low transmitter calibration values, process values,
deviation from set point and process set point. Module shall allow
calibration adjustment and manual change of controller set point.
Module shall be powered by 24 VDC from the controller and
require no external power supply.
SET POINT RAMP GENERATOR
Controller shall be capable of providing automatic ramp-up
and/or ramp-down to or from final process set point incrementally in 4,096 discrete steps. Ramp time shall be adjustable from
a minimum of one second to a maximum or 166 hours and shall
be selected via digital switches on the front panel. Timer on/off,
start/pause/resume, ramp-up/ramp-down and reset functions shall
be capable of remote control with a PLC or DCC interface using
a zero signal (shunt to ground contact closure).
A.C. Power
1/2" Conduit
Pneumatic Input
100 psi Max.
1/8" NPT (Female)
Vent
Pneumatic Output
1/8" NPT (Female)
Electrical Signal
(Input/Output)
1/2" Conduit
.38
(9.5)
6.25
(158)
.312 DIA.
(7.9)
RATINGS
Supply Voltage ……………………115 Volts 50/60 Hz
230 Volts 50/60 Hz
24 Volts DC
Operating Voltage Range…………90 to 110%
Power Consumption ……………10 Watts (max)
0.7 Watts (steady state)
Input ………………………………4-20 mA
Air Supply …………………………100 psig maximum
Output………………………………0 to max supply pressure
Air Consumption …………………0 at steady state
Accuracy …………………………±0.5% Span
Response Speed Range …………200:1
Amplifier Gain………………………Normal = 6
High = 12
Dead Band …………………………Adjustable, 0 to 5% Span
Input Resistance …………………150 Ohms
Enclosure Material …………………Noryl*
Enclosure Cover …………………Polycarbonate
Pneumatic Fittings…………………1/8" FNPT
Air Delivery …………………………0.45 scfm at 30 psi
0.55 scfm at 60 psi
0.63 scfm at 90 psi
Weight………………………………9 lbs (4.1 kg)
*Noryl is a registered trademark of General Electric.
- 188 -
EPC-1 CONTROLLER
OPTIONS
EPC/IS INTRINSICALLY SAFE
The Spence EPC/IS is an intrinsically safe, single loop electro-pneumatic
controller when installed with barriers. It is Factory Mutual approved for:
●
Class I, II, III Division 1, applicable Groups C, D, E, F and G
●
Nonincendive for Class I, Division II, Groups C and D
●
Suitable for Class II and III, Division 2, Groups F and G hazardous locations
EPC/RS REMOTE SET POINT MODULE
The Spence EPC/RS is a 1/4 DIN, panel mounted module in a NEMA 1 enclosure, designed to
provide remote monitoring and control of the EPC-1 Series Controllers up to 1000 feet away.
Included are:
●
31/2" digit, backlit LCD display indicating:
– PMC-1 low and high calibration values
– Process value (temperature, pressure, etc.)
– Process deviation from set point
– Process set point
●
Mode select button and LED indicators
●
Remote set point button
●
Hi-Lo calibration adjustments
EPC/RCS-90 & RCS-90/1S LOCAL CONTROL MODULE
The Spence EPC/RCS-90 is a small enclosure housing a terminal strip and the loading/unloading
solenoid valves which are normally inside the EPC-1 Series Controller. Designed to mount on the
wall or directly on the control valve, the RCS-90 minimizes the air signal line length and requires
only electrical connections to the EPC-1 up to 1000 feet away. Available with hi-cycle standard or
FM approved (same as EPC/IS) intrinsically safe solenoid valves for applications including:
●
Where EPC-1 air output line to the control valve exceeds 60 feet
●
When system response speed needs to be increased
●
Where valve location requires intrinsically safe equipment
●
Ambient temperatures near valve exceed EPC-1 rating but are within RCS-90’s –20 to 175°F
(–29 to 79°C) temperature rating
●
When EPC-1 is installed for remote valve operation
●
To operate double acting cylinder actuators
SET POINT RAMP GENERATOR
The Spence EPC-1 Set Point Ramp Generator module is a factory mounted
module which provides automatic ramp-up or ramp-down to or from final
process set point. The ramp time is adjustable from one second to 166 hours.
Ramp time is selected by digital switches on it’s front panel which replaces the
EPC-1’s lower panel. Remote controllable functions include timer on/off,
start/pause/resume, ramp-up/ramp-down and reset. Applications include:
●
Steam Distribution Systems for automatic, gradual warm-up to prevent
boiler overloads, allow traps to remove high startup condensate loads and
to eliminate water hammer, “banging” and resulting mechanical damage
●
Food, Pharmaceutical and Process Industries in single loop process
control systems
EPC-1 ELECTRO-PNEUMATIC CONTROLLER
O
PTIONS
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