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Model 18TBP/TB

•Description:Variable-Voltage

Power Control

•Product Range:120-240 VAC,

5-25 amps.

•Application:Resistance Loads

FEATURES

•All Solid-State Construction

•Short Circuit Protection

•Integral Heatsink Chassis

•No Thermal Derating

TYPICAL APPLICATIONS

•Replace Variable Transformers

•Electric Heater Control

•Light Dimming

•Hot-Wire Cutting

•Heat Sealing and Packaging

•Plastic Molding and Extruding

•Food Preparation Equipment

Model 18TBP/TB controls provide infi-

nitely variable control of single-phase

a.c. voltage to resistive heating ele-

ments. These controls are solid-state

replacementsforvariabletransformers,

mercury relays, saturable core reac-

tors,andelectromechanicalcontactors.

Power Triacs replace contacts and

brushes to control electric power with-

out moving parts, and, when operated

within their stated ratings for current,

voltage, and temperature, have no

knownMTBForlifeexpectancyrating.

PANEL- OR CHASSIS-MOUNT

Model 18TBP controls are compact,

lightweight packages that employ

single hole mounting to panels and

enclosure doors. Model 18TB con-

trols are designed for rear or rack

mounting.Both utilizean electrically

isolated heatsink chassis.

EXCLUSIVE ADVANCED

TECHNOLOGY:

Three Pillars Of Protection

Model 18TBP/TB controls incorpo-

rate exclusive design features to

protect power semiconductor com-

ponents against damage. “2 milli-

second” fuses protect against

short-circuit damage; an R-C snub-

ber network protects against dv/dt

failure; an integral heatsink chassis

allows continuous operation in

ambients to 50oC with no derating.

SPECIFICATIONS

Power Circuit:power Triac with par-

allel R-C circuit for dv/dt protection

and current-clamping 2 millisecond

fuse for short-circuit protection.

Control Circuit:R-C network with

variable-resistance potentiometer

adjusts firing capacitor into bilateral

diodeconnectedtopowerTriacgate

for stable, full-range control.

Mains Frequency:50/60 Hz.

Output Voltage:0-95% of input.

Overall Efficiency:99%.

Power Loss: approximately 1.5

watts/amp.

Voltage Drop Across Power Circuit

at 100% Output: 1-2 volts maxi-

mum/phase.

Control Input:manual control via

variable potentiometer.

Control Power:1 watt.

Fuse Protection:2 millisecond I2t

fuses are factory tested and coordi-

nated with all power semiconduc-

tors, considering:

a. fuse element melt time tmelt;

b. peak melt current Imelt;

c. arc quench time tarc;

d. peak arc current Iarc.

AmbientTemperatureRange:-10to

+50oC.

Terminal Connections:Bakelite or

thermoplastic blocks.

SIZING CONSIDERATIONS

Model 18TBP/TB controls are rated

for use with constant resistance

loads. Size units by actual load cur-

rent, not kW.

1> Always use maximum possible

load current for sizing purposes.

2> The amp rating is determined by

the fuse. Current draw must not ex-

ceed the fuse rating at any time.

3> Rated voltage of connected load

shouldmatchcontrolinputvoltage.

SIZING EXAMPLE

Application:single-phase, 800 watt

nichrome heating element; input

voltage 120 VAC, 60 Hz.

Model Number Selection:

a.Triac-basedvariable-voltage:SC

b. Panel-mount: E

c. 120 VAC input: 12

d.Amprating,calculatedasfollows:

800 = 6.66 amps

120

Since 6.66<10, amp rating: -10

Model Number:SCE12-10.

WHEN ORDERING, SPECIFY:

•Model Number

•Input Voltage

•Load Specifications

PERFORMANCE NOTE: Triac

power circuits may “slave” when

multiple units are used on 240 VAC

lines derived from three phase

mains. For optimum performance,

use on single phase, 240 VAC de-

rived from 3-wire, 120/240 VAC

mains.

Model 18TBP/TB

SCR Power Controls

Rt. 29 Scott Depot WV 25560-0070 APPLICATION ASSISTANCE - 304/757-7354

24 HOUR FAX - 304/757-7305

Model 18TBP/TB

SCR Power Controls

KVA @ OPEN CHASSIS DIMEN-SIONS

Model Max. Max. Rated Fuse Inches (millimeters)

Number Amps Voltage Number Height Width Depth

Single-Phase, 120 VAC, 50/60 Hz Input, 0-118 VAC Output

18TBP-1-5 5 0.6 49C25-10 3.2 (81) 2.5 (64) 2.5 (54)

18TBP-1-10 10 1.2 49C25-10 3.2 (81) 2.5 (64) 2.5 (54)

18TBP-1-15 15 1.8 49C25-15 3.2 (81) 2.5 (64) 2.5 (54)

18TB-1-15 15 1.8 49C25-15 4 (102) 4 (102) 2.6 (66)

18TB-1-25 25 3.0 49B25-30 6 (152) 4 (102) 2.75 (70)

Single-Phase, 208/220/240 VAC Input, 0-206/218/238 VAC Output

18TBP-2-5 5 1.2 49C25-10 3.2 (81) 2.5 (64) 2.5 (54)

18TBP-2-10 10 2.4 49C25-10 3.2 (81) 2.5 (64) 2.5 (54)

18TBP-2-15 15 3.6 49C25-15 3.2 (81) 2.5 (64) 2.5 (54)

18TB-2-15 15 3.6 49C25-15 4 (102) 4 (102) 2.6 (66)

18TB-2-25 25 6.0 49B25-30 6 (152) 4 (102) 2.75 (70)

Rt. 29 Scott Depot WV 25560-0070 APPLICATION ASSISTANCE - 304/757-7354

24 HOUR FAX - 304/757-7305

All dimensions are approximate, and are not to be used for construction purposes. Payne Engineering Company Inc.

reserves the right to make changes to product design, construction, and component parts in the interest of technical

advancement without prior notification. 18TBP/11.2 3/94

MODEL 18TBP MODEL 18TB

POWER CIRCUIT SCHEMATIC OPEN CHASSIS DIMENSION

WIDTH

HEIGHT

DEPTH

TRIAC