Watlow Series SD31 PID with Optional Countdown Timer - Manual (Page 66)

Wa t l o w S e r i e s S D 3 1
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6 4
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A p p e n d i x
Electromechanical Relay, Form A
• Minimum load current: 10 mA
• 2 A @ 240V Å (ac) or 30VÎ (dc) maximum, resistive
• 125 VA pilot duty, 120/240V Å (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 5V Î (dc), 1 to
5V Î (dc), 0 to 10VÎ (dc)
• Reverse or direct acting
• 0 to 10V Î (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
• A maximum of 32 units can be connected (with additional 485
repeater hardware, up to 247 units may be connected)
• Sampling rate: 20 Hz
Timer Accuracy
• ± 1 second/hour
Agency Approvals
• UL Listed Process Control UL3121 ® (UL 61010C-1), c-UL, CE,
IP65 (NEMA 4X). File # E185611.
UL ® is a registered trademark of the Underwriter’s Laborato-
ries, Inc.
• CSA approved C22.2#24, File 158031
• NSF2 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 2 (22 to 12 AWG),
6 mm (0.25 in) strip length
• Sensor inputs and process outputs: 0.1 to 0.5 mm 2 (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).
Power
• 100 to 240V Å (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
• Height - 29.7 mm (1.17 in)
Width - 52.6 mm (2.07 in)
Behind panel - 97.8 mm (3.85 in
Functionality Matrix
Note: These specifications are subject to change without prior
notice.
Universal
Input
Control Alarm Process 485 Comm
Input 1
Output 1
Output 2