Variable Frequency Drive (Vfd) - Carrier TruVu VVTBP-E2 Installation And Startup Manual

Start-up

Variable frequency drive (VFD)

Verify that the controller's AO-01 output wiring is correctly connected to the VFD and that the VFD is
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configured for a 0-10 Vdc control signal.
In the i-Vu® or Field Assistant tree, select the Bypass controller. Go to Properties > Control Program > Unit
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Configuration, then verify that Control Device Type is set to VFD.
Verify duct air temperature sensor is installed in the air source supply duct.
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Verify that the high pressure tubing from the controller's airflow (pressure) sensor is connected to the duct
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static pressure probe downstream of the bypass damper. Then verify that the low pressure connector is not
blocked.
Calibrate the VFD and pressure sensor:
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a) Disable the air source heating, cooling, and fan outputs using one of the following methods:
• Physically disconnect the air source controller's output wiring to the unit.
• In the i-Vu® or Field Assistant navigation tree, select the RTU Open controller. Go to Properties >
Control Program > Configuration > Service Configuration > Service Test, then enable Service Test. Make
sure all
other outputs under Service Test are disabled.
b) Select the Bypass controller in the tree, then go to Properties > Control Program > Unit Configuration >
Bypass Control > Details tab.
c) Click Damper Full Open, then verify the voltage at AO-01 and Gnd is 0 Vdc.
d) Click Damper Full Close, then verify the voltage at AO-01 and Gnd is 10 Vdc.
e) Click Zero Cal to zero the pressure sensor. When Done appears, click Apply.
f) Enable the air source fan output using one of the following methods:
• Physically connect the air source controller's fan enable wiring at the unit.
• In the i-Vu® or Field Assistant tree, select the RTU Open controller. Go to Properties > Control
Program >
Configuration > Service Configuration > Service Test, then enable Fan Test. Make sure all
other outputs under Service Test are disabled.
g) Select the Bypass controller in the tree, then go to Properties > Control Program > Unit Configuration >
Bypass Control > Details tab.
h) After the static pressure has stabilized, make sure that Target Damper Position and Duct Static Pressure
are not locked and that Target Damper Position is >0% and <100%. You may have to adjust the Duct
Static Pressure Setpoint slightly to get the damper within this range.
i) Using a branch-tee, connect a magnehelic gauge to the High tube on the controller's airflow sensor, then
measure the static pressure. If the measured static pressure is different from the Duct Static Pressure by
±.05 in. (+.012 kPa), click Pressure Sensor Cal, enter the measured value next to the button, then click
Apply.
j) Remove the magnehelic gauge from the High tube and reconnect the pressure tubing.
k) Click Automatic Control to return the bypass to normal control.
l) Enable the air source's heating and cooling outputs using one of the following methods:
• Reconnect the air source controller's output wiring at the unit.
• In the i-Vu® or Field Assistant tree, select the RTU Open controller. Go to Properties > Control
Program > Configuration > Service Configuration > Service Test, then disable Service Test and Fan
Test. Make sure all other outputs under Service Test are disabled.
TruVu™ VVTBP-E2
Installation and Start-up Guide
40
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