ENVIRO-TEC
25
SECTION 2 - START-UP
FORM ET115.24-NOM4 (819)
2
FAN COIL EC MOTOR CONTROL
G3 PWM Board
The Enviro-Tec “Generation 3 PWM” (G3 PWM)
board provides a pulse-width modulated (PWM) signal
to the EC motor to control fan speed. The board is fac-
tory programmed to control the motor in either Three
Speed (adjustable) mode or Proportional Control us-
ing a remote 2 – 10 V DC input signal. In Proportional
Control mode, a 2 – 10 V DC signal will control EC
motor speed between factory set minimum (Min) and
maximum (Max) values. For either control mode, fan
on/off control is enabled via the “G” signal.
Tools Needed
• Digital multimeter capable of measuring 30 volts
AC/DC and duty cycle
•
Insulated 1/8” flat bladed screwdriver
• Mini Hook Test Clips for multimeter (optional)
FIGURE 12 -
G3 PWM BOARD
PWM Board Status LED
The G3 PWM Status LED (refer to
Figure 12 on page
25
) indicates the status of the G3 PWM board. See
Table 1 on page 25
.
TABLE 1 -
G3 STATUS LED DEFINITION
FLASH
MODE
INDICATES
Yes
Run
Normal
Yes
Program
Timed out
Always On
Run
Erro
Always On
Program
Program Mode
Always Off
Any
Fault
Содержание VHA
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