Valley ClassicPlus Control Panel
32
Operation
Percent Timer Setting Calculations
The percent timer regulates the system speed which
controls the amount of water being applied per revo-
lution.
A percent timer setting of 100% would indicate that
the end tower moves continuously or 100% of the
time.
A percent timer setting of 50% would indicate that
the end tower runs 50% of the time or 30 seconds
out of each minute, therefore, doubling the amount
of water being applied.
A sprinkler chart like the one illustrated in Figure
32-1 will provide the operator with the necessary in-
formation to determine water application depths and
revolution times at different percent timer settings.
INCHES(MM) PER
REVOLUTION
PERCENT TIMER
SETTING
HOURS PER
REVOLUTION
0.15 (3.8)
100
21
0.20 (5.1)
77
28
0.30 (7.6)
51
41
0.40 (10.2)
39
55
0.50 (12.7)
31
69
0.60 (15.2)
26
83
0.70 (17.8)
96
96
0.80 (20.3)
19
110
0.90 (22.9)
17
124
1.00 (25.4)
15
138
1.25 (31.8)
12
172
1.50 (38.1)
10
207
1.75 (44.5)
9
241
2.00 (50.8)
8
276
2.50 (63.5)
6
345
3.00 (76.2)
5
413
3.50 (88.9)
4
482
Figure 32-1
If the system length, flow rate in GPM (LPS) and
revolution times are known, these values can be
calculated as described in the following procedure.
1. Determine The System Length.
DLRDU
OH
EGR
SL
SL
= Total System Length - ft (M)
DLRDU = Distance to the Last Regular Drive Unit - ft (M)
OH
= Overhang Length - ft (M)
EGR
= End Gun Radius - ft (M)
Approximate End Gun Radius Coverages
Rain Bird
®
85
=
60 ft (18 M)
Rain Bird
®
95
=
65 ft (20 M)
Nelson 100
=
100 ft (30 M)
Rain Bird
®
03
=
100 ft (30 M)
SL = DLRDU + OH + EGR
Example:
DLRDU = 1260 ft (384 M)
OH
= 64 ft (20 M)
EGR
= 100 ft (30 M)
SL
= 1260 ft (384 M) + 64 ft (20 M) + 100 ft (30 M)
SL
= 1424 ft (434 M)
