Watlow Series 920 Microprocessor-Based Ramping Control - Manual (Page 60)

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Offset of input signal, ±90°F (±50°C), ±50 PVU’s, front panel adjustable
±9.0°F (±5.0°C) for 0.l° units
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°F, °C, or process variable units are user selectable
Output - Control (Single or Dual)
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Output #2 user selectable as cool action
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Solid state relay, Form A, 0.5A @ 24VAC minimum, 264VAC maximum,
10mA minimum load, opto isolated, zero cross switching. OFF state
impedance is 20K ohms minimum
. Open collector, switched DC signal provides a minimum turn ON voltage of
3VDC into a minimum 500 ohm load; maximum ON voltage not greater than
32VDC into an infinite load
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Electromechanical relay, Form C, SPDT; 6A @ 115/23OVAC, 6A @ 28VDC,
1/8 hp @ 115VAC, 125VA piIot duty @ 115VAC. OFF state impedance is
ohms minimum
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Triac 15A, resistive @ 23OVAC, 100mA minimum load, mounted external on
rear of case
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Process, 4-2OmA, non-isolated, load impedance 600 ohms maximum
Output - Auxiliary
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Electromechanical relay, 2 ea; #1 , Form C; #2 Form A, 6A. SPDT: 6A @
115/230VAC, 6A @ 28VDC 1/8 hp @ 115VAC, 125VA pilot duty @
1 1 5 V A C . OFF state impedance is 20K ohms minimum
Accuracy
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Calibration Accuracy: ±0.15% of span, ± digit at 77°F ±°F (25°C ±3°)
ambient & rated line voltage ± 10%
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Accuracy Span: 1000°F (540°C) minimum
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Temperature Stability: ± 2uV°F (3.6uV/°C ambient referred to the input
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Voltage Stability: ±0.01% of span / % of rated line voltage
Agency Approvals
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UL recognized, UL873, File #E43684
Terminals
. #6 compression type, universal bead screw terminals
Communications
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Serial data communications
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RS-422A or RS-423A (RS-232C compatible)
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All operator indication and controls
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ANSI X3.28 protocol, or XON/XOFF protocol
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I s o l a t e d
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DB-15 female receptacle
Power
. 120/240VAC ± 10%, 50/60Hz ±5%.
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18VA power consumption
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Data retention upon power failure via nonvolatile memory.
Operating Environment
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30 to 130°F (0 to 55°C)
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0 to 90% RH, noncondensing
60 WATLOW Series 920 User’s Manual