Trane VUVE Vertical Classroom Manual de instalación descargar pdf (Pagina 10)

10 UV-SVN03F-EN

ECM Application Notes

The new Trane BLDC system has some notable differences

to traditional designs.

RPM Mode

The motors are programmed from the factory to run in

rpm mode and will not change rpm based on external

static pressure, except at the performance limits of the

motor/controller. For ducted units, the units are shipped

with the rpm set for 0.2 in. ESP for High, Medium, and Low

speeds. The speeds can for high, medium, and low

operation, but should not be changed for the electric heat

actuation speeds.

Generally, the fans deliver less cfm for the same rpm, if the

static is increased and the power will decrease. The fan will

deliver more cfm for the same rpm, if the static is

decreased and the fan power will increase. A unit with high

static configuration should not be used to free-deliver air

(i.e., with no ducting attached).

Field Power Wiring

Note: This product uses an electronic variable speed

motor control, which includes a line reactor to

minimize power line harmonic currents. It is

recommended that good wiring practices be

followed to manage building electrical power

system harmonic voltages and currents to avoid

electrical system problems or other equipment

interaction.

Performance Boundaries

While the speeds of the fan motors can be adjusted, never

program a fan speed higher than 1700 rpm, or lower than

450 rpm. In many cases, units configured for high-static

operation will not achieve the desired rpm if the ESP of the

unit is too low, or the unit is allowed to “free-discharge.”

The ECM engine contains settings that will limit the output

power of the motor under these overload conditions. If the

motors cannot achieve rpm close to the target for a specific

period of time, the unit will disable electric heat and fan-

status indicators.

MCA/MFS and Power Draw

The Trane BLDC motors have variable output but are

shipped at specific settings to deliver proper performance

and reliability. The power draw indicated in the catalogue

indicates the power consumed when applied properly (as

shipped and with the nominal ESP applied). However, the

nameplate of the unit indicates the maximum input draw

of the motor, as the motor settings can be changed to draw

more power.

Electric Heat Relays

For quiet operation, the new BLDC units employ power

relays instead of definite purpose contactors for electric

heat actuation. The coils of multiple relays are hooked in

parallel to simulate a multi-pole contactor, as shown in

Figure 1. In Figure 1, two sets of three relays are used to

perform the function of a two 3-pole contactors.

Troubleshooting Other Unit Functions

In some cases, the normal or abnormal operation of the

BLDC system may interact with other components in the

system. Generally, verification of the engine and adapter

boards’ wiring and configuration should be checked if

there are unexplained abnormalities in other areas of the

unit:

1. Valve operation

2. Electric Heat operation

3. Changeover sensor operation

4. Damper operation

5. Condensate overflow switch

A high degree of protection is provided on electric heat

nits. If electric heat fails to actuate, it may be because of

one of the following events:

1. Fans are failing to meet target speed. If a second motor

is not present, all settings for speeds for Motor 2

should be set to 0000.

2. Hot water may be available in the changeover coil.

3. The connection to analogue input 1 on the Tracer ZN

controlle

r may be reversed in polarity.

4. Target speeds for motor

s may be set too high:

a. The  parameter may be set incorrectly.

b. The

 parameter may be set incorrectly.

Figure 1. Sample arrangement: electric heat relay

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Trane VUVE Vertical Classroom Manual de instalación Pagina 10

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