90 VAV Controller—Variable Air Volume Controller
Table 46: Input/Output Specifications for VAV 100/101
Function Reso-
lution
Sam-
pling
Time
Accu-
racy
Range DC Input
Imped-
ance
Sensor/
Load
Impedance
Noise
Protection*
Noise/Surge
Standard
Tested To*
AI-Voltage
14 bit 1.5 sec
20 mV
0-2 V or
0-10 VDC
470k ohm 0-5k ohm NM ResCap
+ CM Cap
IEEE-587
AI-
Temperature
14 bit 1.5 sec
0.5F
1000 ohm Si 3540 ohm 0-2k ohm NM ResCap
+ CM Cap
a) CM Ringwave:
1.5k V
AI-
Temperature
15 bit 1.5 sec
0.7F
1000 ohm Ni 3540 ohm 0-2k ohm NM ResCap
+ CM Cap
b) NM Bi-Wave:
1.5k V, 3k A
AI-
Temperature
16 bit 1.5 sec
1.3F
1000 ohm Pt 3540 ohm 0-2k ohm NM ResCap
+ CM Cap
IEEE-472
AI-
Potentiometer
17 bit 1.5 sec
0.1F
0-2k ohm
Potentiometer
3540 ohm 0-2k ohm NM ResCap
+ CM Cap
a) CM Ringwave:
1.5k V
ACCUM-DC
32 bit 10 ms
(100 Hz)
N/A 0-15 VDC,
2.5 V Trig **
47k ohm 0-5k ohm NM ResCap
+ CM Cap
b) NM Ringwave:
500V
BI-DC Sense
1 bit 10 ms N/A 0-15 VDC,
2.5 V Trig **
47k ohm 0-5k ohm NM ResCap
+ CM Cap
AO Voltage
8 bit 1.5 sec N/A 0-10 VDC @
10 mA maximum
N/A 1k-10M ohm No Special
Parts
BO-AC Triac
N/A 1.5 sec N/A 24 VAC
@ 50-500 mA
N/A 48-480 ohm Opto +
CM Cap
DC Supply
Out
N/A N/A N/A 14.6-17 VDC
@ 90 mA
N/A 162-10M ohm Opto +
CM Cap
N2 Bus
N/A N/A N/A 5000 ft/
1500 m
N/A N/A PTC +
Tranzorb
IEEE-587
CM Ringwave: 1.5k V
NM Ringwave: 500V
Zone Bus
N/A N/A N/A 500 ft/150 m N/A N/A PTC +
Tranzorb
IEEE-472
CM Ringwave: 1.5k V
NM Ringwave: 500V
State of Outputs During PWR. Fail = Disables when 24 VAC PWR drops below 18 VAC
State of Outputs After PWR. is Restored = Remain disabled for 10 seconds minimum, and then come on per
Restart Configuration.
* NM = normal mode, CM = common mode.
CM Cap is a common mode capacitor connected from the I/O point to a separate ground plane.
** To interface to TTL outputs such as demand meters, use an open collector output to drive the +15 VDC pull-up resistor and
contact cleaning current capacitor.
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