User`s manual

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Watlow Series SD ■ 72 ■ Appendix

Solid-state Relay

• Optically isolated

• Zero cross switched

•Without contact suppression

• Minimum load current: 10 mA rms

• Maximum current: 0.5A rms at 24 to 240VÅ (ac), resistive

• 20 VA pilot duty, 120/240VÅ (ac), inductive

• Must use RC suppression for inductive loads

• Maximum offstate leakage current: 100 µA rms

Electromechanical Relay, Form A

• Minimum load current: 10 mA

•2 A@ 240VÅ (ac) or 30VÎ (dc) maximum, resistive

• 125 VA pilot duty, 120/240VÅ (ac), inductive

• Must use RC suppression for inductive loads

• Electrical life 100,000 cycles at rated current

Electromechanical Relay, Form C

• Minimum load current: 10 mA

•5 A@ 240VÅ (ac) or 30VÎ (dc) maximum, resistive

• 125 VA pilot duty, 120/240VÅ (ac), inductive

• Must use RC suppression for inductive loads

• Electrical life 100,000 cycles at rated current

Process *

• Range selectable: 0 to 20 mA, 4 to 20 mA, 0 to 5VÎ (dc), 1 to

5VÎ (dc), 0 to 10VÎ (dc)

• Reverse or direct acting

•0 to 10VÎ (dc) voltage output into 1,000 Ω minimum load resist-

ance

•0 to 20 mA current output into 800 Ω maximum load resistance

• Resolution:

dc ranges: 2.5 mV nominal

mA ranges: 5 µA nominal

• Calibration accuracy:

dc ranges: ±15 mV

mA ranges: ±30 µA

•Temperature stability: 100 ppm/°C

Communications

EIA/TIA-485

• Isolated

• Modbus™ RTU protocol

• 9600, 19200 and 38400 baud rates

•Amaximum of 32 units can be connected (with additional 485

repeater hardware, up to 247 units may be connected)

• Sampling rate: 20 Hz

IrDA

• Modbus™ RTU via IRCOMM over IrDA

• Sampling rate: 20 Hz

Agency Approvals

•ULListed Process Control UL3121

(UL 61010C-1), c-UL, IP65

(NEMA 4X). File # E185611.

is a registered trademark of the Underwriter’s Laborato-

ries, Inc.

• CE approved. See Declaration of Conformity.

• CSA approved C22.2#24, File 158031

• NSF 2 approved for type E, J, K, T and RTD sensors, File

49660-0002-000.

Terminals

•Touch-safe

• Input power and control outputs: 0.2 to 4 mm

(22 to 12 AWG), 6

mm (0.25 in) strip length

• Sensor inputs and process outputs: 0.1 to 0.5 mm

(28 to 20

AWG), 8 mm (0.30 in) strip length

• Solid or tinned wire recommended for spring clamp style con-

nectors.

•Torque: terminal blocks 1 to 6 (SD _ _ - _ [C, K or J] _ _ - _ _ _ _)

and 1 to 4 (SD _ _ - _ F _ _ - _ _ _ _ ) are 0.8 Nm (7 in-lb); termi-

nal blocks 12, 13, and 14 are 0.9 Nm (8 in-lb).

Power

• 100 to 240VÅ (ac) +10%; -15%; 50/60 Hz, ±5%

• 24V‡ (ac/dc) +10%; -15%; 50/60 Hz, ±5%; Class 2 power source

is required for low-voltage model.

• 10VA maximum power consumption

• Data retention upon power failure via nonvolatile memory

Operating Environment

• -18 to 65°C (0 to 149°F)

•0 to 90% RH, non-condensing

• Storage temperature: -40 to 85°C (-40 to 185°F)

Dimensions

Weight

(approximate)

• SD3 - 75 g (0.16 lbs)

• SD6 - 100 g (0.22 lbs)

• SD8 - 145 g (0.32 lbs)

• SD4 - 200 g (0.43 lbs)

Functionality Matrix

Note: These specifications are subject to change without prior

notice.

DIN Size

Behind

Panel

(max.)

Width Height

1/32

97.8 mm

(3.85 in)

52.6 mm

(2.07 in)

29.7 mm

(1.17 in)

1/16

97.8 mm

(3.85 in)

52.1 mm

(2.05 in)

52.1 mm

(2.05 in)

1/8 Vertical

97.8 mm

(3.85 in)

52.8 mm

(2.08 in)

99.8 mm

(3.93 in)

1/8

Horizontal

97.8 mm

(3.85 in)

99.8 mm

(3.93 in)

52.8 mm

(2.08 in)

1/4

101.1 mm

(3.98 in)

99.8 mm

(3.93 in)

99.8 mm

(3.93 in)

Universal

Input

Control Alarm Process 485 Comm

Input 1

Output 1

Output 2

Output 3

Display

Height

(in.)

L- 7.6 mm (0.30)

R - 5.6 mm (0.22)

U -10.2 mm (0.40)

L- 6.1 mm (0.24)

U -10.2 mm (0.40)

L- 6.1 mm (0.24)

U -10.2 mm (0.40)

L- 6.1 mm (0.24)

U -14.2 mm (0.56)

L -10.2 mm (0.40)