Johnson Controls VMA 1410 Overview And Engineering Manuallines page 29

VMA1400 Series Overview and Engineering Guidelines Technical Bulletin
Table 18: Additional Detailed VMA Specifications
Feature
Power Input
Voltage Range
Input Current
Transient Protection
N2 Bus Communications
Bus Type and Voltage
Bus Speed
Transient Protection
Zone Bus Communications
Bus Type and Voltage
Bus Speed
Transient Protection
Microprocessor/Memory
Microprocessor
Memory
DC Supply Output
Voltage Range
Load Current
Overload and Transient
Protection
Pressure Input
Range
Proof Pressure
Burst Pressure
Resolution (15 bit)
Non-Repeatability and
Hysteresis
Non-linearity (Best Fit)
Thermal Effect on Zero*
Thermal Effect on Span
Position Effect on Zero*
Position Effect on Full Span
Long Term Zero Drift*
Long Term Span Drift
Sample Time
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Specification
20 to 30 VAC; 50 or 60 Hz
0.5 Ampere without Relays or Valves
Isolated from AI, BI, AO, ZBus, +15 VDC and N2 Bus;
Common and Normal Mode Capacitor
RS-485 (Differential +5 VDC)
9600 Baud
Isolated from 24 VAC, BOs, AI, BI, AO, ZBus, +15 VDC;
PTC+Transorb; Common Mode Capacitors
RS-422 (Single-ended 5 VDC) or RS-485 (Differential +5 VDC)
1200 Baud
Isolated from 24 VAC, BOs and N2;
PTC+Transorb; Common Mode Capacitors
8-bit Motorola® 68HC11 operating at 8 MHz
256 K byte FLASH PROM; 32K byte static RAM
13.5 to 18 VDC
0 to 35 mA
Current Foldback; Isolated from 24 VAC, BOs and N2 Bus;
Common Mode Capacitors
0 to 374 Pascal (0 to 1.5 in. w.c.)
6895 Pascal (1 psi)
68.9 K Pascal (10 psi)
0.0151 Pascal (0.000061 in. w.c.)
+0.187 Pascal (+0.00075 in. w.c. maximum)
+2 Pascal (+0.008 in. w.c. maximum) for 0-249 Pascal (<1 in. w.c.)
+3 Pascal (0.012 in. w.c. maximum) for >249 Pascal
(>1 in. w.c.)
+0.1793 Pascal per degree C
(+0.00040 in. w.c. per degree F maximum)
+0.1793 Pascal per degree C
(+0.00040 in. w.c. per degree F maximum)
+0.623 Pascal (+0.0025 in. w.c. maximum)
+0.623 Pascal (+0.0025 in. w.c. maximum)
+2.491 Pascal per year (+0.01 in. w.c. per year maximum)
+2.491 Pascal per year (+0.01 in. w.c. per year maximum)
One second
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