Dwyer TDC User Manual

SPECIFICATIONS

Step Two

Supply voltage: 120 / 240 VAC, 50 - 60 Hz.
Consumption: 5 Watt
Sensor supply: 13.5 VDC @ 100 mA
Relay type: TDC1: (1) SPDT

TDC2: (1) SPDT, (1) Latched SPDT
Relay load: 250 VAC, 10A, 1/2 hp.
Relay mode: Selectable, NO or NC
Time delay: 0 to 60 seconds
LED indication: Sensor, relay & power status
Fail safety: Power fail-safe

Temperature range: F: -40 to 158

C: -40 to 70

Enclosure rating: Panel or 35 mm DIN Rail

(EN 50 022)
Enclosure material: Polypropylene (U.L. 94 VO)
Certificate number: LR 79326-3 (CSA/NRTL)

Functional Diagram

NC

C

NO

(+)

(-)

Sensor

Input

1

S

Latch / Invert Logic

Time Delay

Relay

("Relay 1"

in LC82)

+ - S+ - S

Dimensions

POWER

INPUT1 INPUT2A INPUT2B

3.9"

INVERT INVERT DELAYDELAY

—

+

RELAY 1

LATCH

ONOFF

—

+

RELAY 2

1.8"

2.7"

AC
AC

Power

Supply

Sensor

Input

A*

Sensor

Input

B*

GND

Latch / Invert Logic

Time Delay

NC

C

NO

Relay

("Relay 2" in LC82)

Part Number Information:

Part # Mat'l Description

TDC1 PP Flow/No-Flow Controller
TDC2 PP Dual Flow/No-Flow Controller

Make a Fail-Safe System:

Design a fail-safe system that accommodates the possibility of relay or
power failure. If power is cut off to the controller, it will de-energize the
relay. Make sure that the de-energized state of the relay is the safe state in
your process. For example, if controller power is lost, a pump will turn off
if it is connected to the Normally Open side of the relay.

While the internal relay is reliable, over the course of time relay failure is
possible in two modes: under a heavy load the contacts may be “welded”
or stuck into the energized position, or corrosion may build up on a

3.1"

3.6"

TDC1 FaceplateApproval Label

PO WE R

INVERT

®

NRTL-C

Power Supply

LR79326 -3

INPUT1

--

+

RELAY 1

DELAY

120/240 VAC, 50 - 60 Hz
5 Watt

Maximum Relay Rating

250 VAC, 10 A, 1/2 Hp

Refer to the instruction
manual for installation

TDC2 Faceplate

instructions.

contact so that it will not complete the circuit when it should. In critical
applications, redundant backup systems and alarms must be used in
addition to the primary system. Such backup systems should use different
sensor technologies where possible.

While this manual offers some examples and suggestions to help explain
the operation of Dwyer products, such examples are for information only
and are not intended as a complete guide to installing any specific system.

PO WER

INVERT INVERT

--

+

RELAY 1 RELAY 2

INPUT1 INPUT2A

DELAY

DELAY

--

+

LATC H

INPUT2B

ONOFF