18D-1-20I PAYNE ENGINEERING, 18D-1-20I Datasheet - Page 2

• Manufacturer Part Number: 18D-1-20I
• Description: Variable Transformer
• Manufacturer: PAYNE ENGINEERING

Specifications of 18D-1-20I

• Power Supply Output Type: Variable
• No. Of Outputs: 1
• Output Voltage: 118V
• Power Rating: 2.4kVA
• Length: 153mm
• Width: 153mm
• Height: 254mm
• Transformer Mounting: Panel
• Secondary Current Nom: 20A
• External Depth: 3.0"
• External Height: 6.25"
• External Width: 3.5"
• Rohs Compliant: NA
• Lead Free Status / RoHS Status: na

Rt. 29 Scott Depot WV 25560-0070
Terminal Connections: 1 0-30 amp
use Bakelite or thermoplastic
blocks; 50 amps and larger use
screw lugs or stud bolts.
RMS Voltage Limit: circuit-board
mounted variable-resistance trim-
mer in series with manual potenti-
ometer. Allows the user to limit
output voltage to connected load at
maximum potentiometer setting.
Not applicable to units controlled by
external analog signal.
Milliamp Control: circuitry integral to
main control board that allows out-
put voltage to be controlled by exter-
nal analog signal (milliamps or d.c.
voltage) in closed-loop system. Volt-
age output from power control is
proportional to analog signal input.
Multi-turn SPAN and GAIN trimmers
provide for field calibration/adjust-
ment of signal response range.
Output Current Limit: output voltage
from control is varied to keep load
current at or below adjustable limit.
Includes current transformer.
RMS Output Voltage Regulation:
output voltage variations are limited
to
voltage may not be greater than
75% of minimum input voltage.
Isolated Chassis Construction:
electrically isolated chassis avail-
able through 80 amp size. Note: 18D
controls with “i” suffix in model num-
ber include isolated chassis con-
struction as standard feature.
Thermistor Control: control accepts
input from temperature-sensing
thermistor probe, and automatically
adjusts power control output voltage
to maintain load temperature at level
selected on temperature set potenti-
ometer in closed-loop control
scheme. Available temperature
ranges: 0-90
Thermistor probe, 3 ft. of cable, and
set-point potentiometer included.
Soft-Start:output voltage to load is
ramped from 0 to potentiometer-se-
lected level over 1/2 second after
30%. Maximum regulated output
STANDARD OPTIONS
1% for input variations up to
o
C and 90-240
o
C.
actuation to reduce inrush currents.
Operates upon closure of On/Off
switch in potentiometer and main
power activation; must be reset by
opening same switch or removing
main power before operating again.
Optically Isolated ma. Control Card:
circuit card for field retrofit of manu-
ally operated controls for automatic
control in response to external ana-
log milliamp signal. Optically iso-
lated circuit permits use in open- or
closed-loop control schemes. Volt-
age output from power control is
proportional to analog signal input.
Multi-turn SPAN and GAIN trimmers
provided for field calibration/adjust-
ment of signal response range.
Retrofit:18D (120 and 240 VAC, to
30 amps) as built prior to 8/90.
Heatsink Overtemperature Switch:
temperature sensor mounted to
heatsink switches if heatsink tem-
perature exceeds maximum allow-
able level. Available to turn off
control or drive external indicating
signal.
120 V Pilot: 120 VAC pilot voltage
used to actuate control.
70-400 Hz: control configured for
operation at frequencies ranging
from 70-400 Hz, or 16-
277 VAC Input: unit rated for sin-
gle-phase 277 VAC input.
550 VAC Input: unit rated for 550
VAC input (+10% max.).
600 VAC Input: unit rated for 600
VAC input (+10% max.).
18D/E power controls can be sup-
plied in a steel electrical enclosure
with hinged front cover. Enclosures
are ventilated to facilitate proper
cooling of the control. Ventilation
openings are covered by expanded
metal mesh, and located in the bot-
tom and the top of the side panels.
Enclosure fans are not required. For
non-ventilated enclosure require-
ments, consult local sales office.
SIZING CONSIDERATIONS
ENCLOSURES
2/3
and 25 Hz.
APPLICATION ASSISTANCE - 304/757-7354
Model 18D/E SCR power controls
are designed for use on constant-re-
sistance loads only. Size units by
actual load current, not kW.
1> Always use maximum possible
load current for sizing purposes.
2> The amp rating on all power con-
trols is determined by the fuse(s).
Current draw must not exceed the
fuse rating at any time.
3> Rated voltage of the connected
load should match the input voltage
to the power control.
Application:proportional control of
three-phase, 480 VAC, delta-con-
nected 15 kW constant-resistance
heating elements; 480 VAC,
three-phase, 60 Hz input voltage.
Model Number Selection:
a. Variable-voltage: 18
b. Three-phase: E
c. 480 VAC input: -4-
d. Amp rating, calculated as follows:
15.0 x 1000 = 18.06 amps/phase
480 x 1.73
Since 18.06<20, amp rating: 20
Model Number:18E-4-20
Options:as required.
WHEN ORDERING, SPECIFY:
Model Number
Input Voltage
Frequency
Load Specifications
Options
Enclosure Requirements
SCR Power Controls
SIZING EXAMPLE
24 HOUR FAX - 304/757-7305
Model 18D/E