Watlow SDAC - Manual (Page 4)

4 WATLOW SDAC User’s Guide
Table 2. Physical Specifications
Table 3. Agency Approvals / Compliance
Inputs
The Serial DAC requires a proprietary serial data sig-
nal and the clock signal from the controller. The Serial
DAC also requires a 5V
Î (dc) power input.
Table 4. Screw Terminals
Table 5. Serial DAC Inputs
Table 6. Power Requirements
Analog Outputs
Table 7. Output Specifications
Parameter Description
Absolute Maximum
Common Mode
Voltage Measured between output pins and con-
troller common: 1,000V
Resolution 15 bits (plus polarity bit for voltage outputs)
(0.305 mV for 10V output range)
(0.00061 mA for 20 mA output range)
Accuracy (calibrated
for voltage output) For voltage output: +/- 0.005V (0.05% at
full scale)
For current output: +/ 0.1 mA (0.5% at full
scale)
Temperature coeffi-
cient 440 ppm/°C typical
Isolation Breakdown
Voltage 1000V between input power and signals
Current 0 to 20 mA with 10V minimum compliance
(500 ohm load)
Voltage 0 to 10V Î (dc) with 10 mA source
capability
Output Response
Time 1 ms typical
Update Rate Once per controller A/D cycle nominal.
Twice per second maximum for 60 Hz clock
rate.
Output changes are step changes due to
the fast time constant. All Serial DAC loop
outputs are updated at the same time.
Parameter Description
Voltage 4.75 to 5.25V Î (dc) @ 300 mA maximum
Parameter Description
Data
4 mA maximum to DC COM
Open collector or HC CMOS logic levels
Clock
0.5 mA maximum to DC COM
Open collector or HC CMOS logic levels
Wire Gauge 24 to 12 AWG
Screw Terminal Torque
0.5 to 0.6 Nm (4.5 to 5.4
inch-pound)
CE Directive Electromagnetic Compatibility (EMC)
directive 89/336/EEC
UL® and C-UL® UL916, Standard for Energy
Management Equipment, File E177240
Weight 0.34 kg 0.76 lb
Length 138 mm 5.5 in
Width 91 mm 3.6 in
Height 44 mm 1.8 in