Applications Guide Tracer Graphical Programming - Trane
Applications Guide Tracer Graphical Programming - Trane Applications Guide Tracer Graphical Programming - Trane
® Chapter 3 Modifying the exhaust fan program Using a Constant block for a deadband value Becauseweaddedavariableblocktoserveasthesetpoint,wedonot need the constant block for this purpose. However, the sequence of operation does call for a 5.0°F deadband. Use the Constant block for the 5.0 value. To use a Constant block for a deadband value: 1. Change the 85.0 constant block value to 5.0. 2. Modify the associated comment to read “(°F).” Connecting blocks to a Deadband block 1. Connect the Equip Rm Space Temp input block to the Input port of the Deadband block. 2. Connect the Equip Rm Temp Setpoint variable block to the Setpoint port of the Deadband block. 3. Connect the 5.0 constant block to the Deadband port of the Deadband block. 4. Connect the output port of the Deadband block to the Equip Rm Fan On/Off output block.(Figure 37). Figure 37: Program with deadband Adding alarm indication The program meets all specifications of the sequence of operation with one exception: If the Equip Rm Space Temp input fails, turn the fan on and indicate an alarm condition. Adding an alarm variable The configured, binary variable, Equip Rm Alarm, serves as the alarm indicator. Note: Variables that indicate status, such as the Equip Rm Alarm variable, may be added to custom displays so that they appear on the operator display. See the Tracer MP580/581 Programmable Controller Programming guide (CNT-SVP01A-EN) for more information about custom displays. 36 CNT-APG001-EN
® Adding alarm indication To add an alarm variable: 1. Add another Variable block to the design space above the Equip Rm Fan On/Off output block. 2. Set the variable to the binary variable, Equip Rm Alarm, which is sourced from the program. 3. Set the block to write to the Equip Rm Alarm variable (Figure 38). Figure 38: Equip Rm Alarm binary variable in the design space Binary variable block Implementing a test for sensor failure UseaFailblocktochecktheEquipRmSpaceTempinputandsendinformation to the Equip Rm Alarm variable. When the temperature input fails, the output of the Fail block is true, and the binary variable, Equip Rm Alarm, indicates the failure by turning on. For the Fail block to detect properly an input failure, it must be applied to analog inputs configured as thermistor, Balco, Platinum, current, voltage, or resistance. The Fail at End of Range option must also be selected for the input in the Configuration dialog box. To implement a test for sensor failure: 1. From the Blocks menu, choose Test. From the Test menu, choose Fail. 2. Click in the design space to add a Fail block above the Deadband block. 3. Connect the wire leaving the Equip Rm Space Temp input block to the input port of the Fail block. Note: You can draw more than one connection from an output port. 4. Connect the output port of the Fail block to the input port of the Equip Rm Alarm variable block (Figure 39 on page 38). CNT-APG001-EN 37
- Page 10 and 11: ® Contents Chapter 5 Cooling tower
- Page 12 and 13: ® Contents Chapter7 Constant-volum
- Page 14 and 15: ® Contents Summary-question answer
- Page 16 and 17: ® Figures Chapter3 Modifyingtheexh
- Page 18 and 19: ® Figures Figure 96: Input blocks
- Page 20 and 21: ® Figures Chapter 8 Constant-volum
- Page 22 and 23: ® Figures xx CNT-APG001-EN
- Page 24 and 25: ® Tables Chapter7 Constant-volumeA
- Page 26 and 27: ® Chapter 1 Using the Tracer Graph
- Page 28 and 29: ® Chapter 1 Using the Tracer Graph
- Page 30 and 31: ® Chapter 1 Using the Tracer Graph
- Page 32 and 33: ® Chapter 1 Using the Tracer Graph
- Page 34 and 35: ® Chapter 1 Using the Tracer Graph
- Page 36 and 37: ® Chapter 2 Writing the exhaust fa
- Page 38 and 39: ® Chapter 2 Writing the exhaust fa
- Page 40 and 41: ® Chapter 2 Writing the exhaust fa
- Page 42 and 43: ® Chapter 2 Writing the exhaust fa
- Page 44 and 45: ® Chapter 2 Writing the exhaust fa
- Page 46 and 47: ® Chapter 2 Writing the exhaust fa
- Page 48 and 49: ® Chapter 2 Writing the exhaust fa
- Page 50 and 51: ® Chapter 2 Writing the exhaust fa
- Page 52 and 53: ® Chapter 2 Writing the exhaust fa
- Page 54 and 55: ® Chapter 3 Modifying the exhaust
- Page 56 and 57: ® Chapter 3 Modifying the exhaust
- Page 58 and 59: ® Chapter 3 Modifying the exhaust
- Page 62 and 63: ® Chapter 3 Modifying the exhaust
- Page 64 and 65: ® Chapter 3 Modifying the exhaust
- Page 66 and 67: ® Chapter 3 Modifying the exhaust
- Page 68 and 69: ® Chapter 3 Modifying the exhaust
- Page 70 and 71: ® Chapter 3 Modifying the exhaust
- Page 72 and 73: ® Chapter 4 Cooling tower with two
- Page 74 and 75: ® Chapter 4 Cooling tower with two
- Page 76 and 77: ® Chapter 4 Cooling tower with two
- Page 78 and 79: ® Chapter 4 Cooling tower with two
- Page 80 and 81: ® Chapter 4 Cooling tower with two
- Page 82 and 83: ® Chapter 4 Cooling tower with two
- Page 84 and 85: ® Chapter 4 Cooling tower with two
- Page 86 and 87: ® Chapter 4 Cooling tower with two
- Page 88 and 89: ® Chapter 4 Cooling tower with two
- Page 90 and 91: ® Chapter 4 Cooling tower with two
- Page 92 and 93: ® Chapter 4 Cooling tower with two
- Page 94 and 95: ® Chapter 4 Cooling tower with two
- Page 96 and 97: ® Chapter 4 Cooling tower with two
- Page 98 and 99: ® Chapter 4 Cooling tower with two
- Page 100 and 101: ® Chapter 4 Cooling tower with two
- Page 102 and 103: ® Chapter 4 Cooling tower with two
- Page 104 and 105: ® Chapter 5 Cooling tower with var
- Page 106 and 107: ® Chapter 5 Cooling tower with var
- Page 108 and 109: ® Chapter 5 Cooling tower with var
®<br />
Chapter 3 Modifying the exhaust fan program<br />
Using a Constant block for a deadband value<br />
Becauseweaddedavariableblocktoserveasthesetpoint,wedonot<br />
need the constant block for this purpose. However, the sequence of operation<br />
does call for a 5.0°F deadband. Use the Constant block for the 5.0<br />
value.<br />
To use a Constant block for a deadband value:<br />
1. Change the 85.0 constant block value to 5.0.<br />
2. Modify the associated comment to read “(°F).”<br />
Connecting blocks to a Deadband block<br />
1. Connect the Equip Rm Space Temp input block to the Input port of<br />
the Deadband block.<br />
2. Connect the Equip Rm Temp Setpoint variable block to the Setpoint<br />
port of the Deadband block.<br />
3. Connect the 5.0 constant block to the Deadband port of the Deadband<br />
block.<br />
4. Connect the output port of the Deadband block to the Equip Rm Fan<br />
On/Off output block.(Figure 37).<br />
Figure 37: Program with deadband<br />
Adding alarm indication<br />
The program meets all specifications of the sequence of operation with<br />
one exception: If the Equip Rm Space Temp input fails, turn the fan on<br />
and indicate an alarm condition.<br />
Adding an alarm variable<br />
The configured, binary variable, Equip Rm Alarm, serves as the alarm<br />
indicator.<br />
Note:<br />
Variables that indicate status, such as the Equip Rm Alarm<br />
variable, may be added to custom displays so that they appear<br />
on the operator display. See the <strong>Tracer</strong> MP580/581 Programmable<br />
Controller <strong>Programming</strong> guide (CNT-SVP01A-EN) for<br />
more information about custom displays.<br />
36 CNT-APG001-EN
Change language