ITT Industries PumpSmart PS200, Configuration & Operation Manual

Page: 100 / 159

PS200 Configuration & Operation Guide
OPTIONS & FEATURES
Page 97
Mechanical seal losses are the most common form of offset. The following table may be used as a starting point:
1.375 1.75 2.125 2.50 2.75 3.00 3.75 1.375 1.75 2.125 2.50 2.75 3.00 3.75
3560
0.38
(0.28)
0.44
(0.33)
0.52
(0.39)
0.62
(0.46)
0.70
(0.52)
- -
0.68
(0.51)
0.8
(0.60)
0.94
(0.70)
1.12
(0.84)
1.25
(0.93)
- -
2900
0.31
(0.23)
0.36
(0.27)
0.43
(0.32)
0.51
(0.38)
0.57
(0.43)
- -
0.56
(0.42)
0.65
(0.48)
0.77
(0.57)
0.91
(0.68)
1.02
(0.76)
- -
1780
0.19
(0.14)
0.22
(0.16)
0.26
(0.19)
0.31
(0.23)
0.35
(0.26)
0.39
(0.29)
0.54
(0.40)
0.34
(0.25)
0.40
(0.30)
0.47
(0.35)
0.56
(0.42)
0.63
(0.47)
0.70
(0.52)
0.96
(0.72)
1470
0.16
(0.12)
0.18
(0.13)
0.22
(0.16)
0.26
(0.19)
0.29
(0.22)
0.32
(0.24)
0.44
(0.33)
0.28
(0.21)
0.33
(0.25)
0.39
(0.29)
0.46
(0.34)
0.52
(0.39)
0.58
(0.43)
0.80
(0.60)
1180 -
0.15
(0.11)
0.17
(0.13)
0.21
(0.16)
0.23
(0.17)
0.26
(0.19)
0.35
(0.26)
-
0.26
(0.19)
0.31
(0.23)
0.37
(0.28)
0.42
(0.31)
0.46
(0.34)
0.64
(0.48)
960 -
0.12
(0.09)
0.14
(0.10)
0.17
(0.13)
0.19
(0.14)
0.21
(0.16)
0.29
(0.22)
-
0.22
(0.16)
0.25
(0.19)
0.31
(0.23)
0.34
(0.25)
0.38
(0.28)
0.52
(0.39)
885 - - - - -
0.19
(0.14)
0.27
(0.20)
- - - - -
0.35
(0.26)
0.48
(0.52)
740 - - - - -
0.16
(0.12)
0.22
(0.16)
- - - - -
0.29
(0.22)
0.40
(0.30)
RPM
Nominal Mechanical Seal Size per Pump Shaft Diameter (in)
Single Inside Seal Losses Hp (kW) Double Inside Seal Losses Hp (kW)
For between bearing pumps, double the above values.
If the pump operation requires the pump minimum speed to operate below 33% of nameplate speed than it is
recommended the final Power Offset value be determined by viewing the value of parameter 25.18 CALC TEST
TORQ% while the pump is operating. The procedure is as follows:
1. Check the value of 25.18 CALC TEST TRQ % while operating at the normal process setpoint.
2. Next reduce the pump speed to 14.02 MINIMUM SPEED. To do this in single pump and multipump use the
manual override feature (parameters 12.06/12.07). Check the value of 25.18 CALC TEST TRQ % again.
Important: do not change any valve or system settings during this process.
3. If the value of 25.18 CALC TEST TRQ % is greater than in Step 1 increase the power offset value until the Calc
Test Trq % has approximately the same value as in Step 1.
4. Return the PS200 to normal process control by setting parameter 12.06 MANUAL OVERRIDE to OFF.
Note: for some large hp motors the value of 25.18 CALC TEST TRQ % as viewed in step 3 may be less than in Step
1. In this case a small negative value of power offset should be used.
Helpful Hint: To avoid nuisance trips during system transients, set up a response delay using 25.03 PROTECTION
DELAY.