AI-Tek Instruments TACHTROL 3, Инструкция по эксплуатации, Страница: 14 / 30

Use Table 1 to select the behavior and type of relay setpoint. The numbers in the table denote
the numbers placed in the second digit of Constant C
12
for setpoint 1 and the third digit of
Constant C
12
for setpoint 2.
SETPOINT TYPE
TABLE 1. RELAY SETPOINT BEHAVIOR AND TYPE
4.3.4 Sample Set-ups
Single Channel Operation
Suppose you are measuring the rate at which paper is passing along a bed roll, the diameter
of the roller plus twice the thickness of the conveyor belt is equal to 36 inches. The sensor is read-
ing from a 24 tooth gear.
You want the tachometer to;
1. Compute Speed A in RPM
SF = C
1
= 60 = 60 = 10
C
2
, PPR 24 4
C
1
= 10.000
(C
3
and C
4
are not adjusted)
C
2
= 4.000
(C
3
and C
4
are not adjusted)
2. Send Computed Function (Speed A) to All Outputs
Speed A = 1 on Function Chart
C
11 =
X 1 1 1 1 x - denotes unused digit
3. Have Display Show FPM with Autoranging to Two Decimals, right only
A x C
5
= Display value: RPM x FPR = FPM
10
Overspeed
hysteresis below
setpoint
de-energize above
setpoint
0
energize above
setpoint
2
de-energize above
setpoint
4
energize above
ssetpoint
6
Underspeed
hysteresis above
setpoint
de-energize below
setpoint
1
energize below
setpoint
3
de-energize below
setpoint
5
energize below
setpoint
7
Auto Reset
Failsafe
Auto Reset
Non-Failsafe
Latching
Failsafe
Latching
Non-Failsafe
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