Anemostat EST - Manual (Page 30)

30
Troubleshooting EST Controllers (PWM) - continued
EVO/ECM Series Control Test Procedure
This procedure allows you to test an EVO/ECM series GE ECM Motor control while it is
powered and connected to the motor. The series includes many types of controls, all having
the same interface to the ECM motor.
Motor Interface
The EVO/ECM series uses a 4 wire interface to the motor. Most equipment uses our standard
color coding for these wires:
Pin 1. White Motor On/Off 0 = Off, ~22Vdc = On
Pin 2. Black Tachometer
Pin 3. Green Common
Pin 4. Red Speed 0 = Min. Speed, ~22Vdc = Max. Speed
Problem Solver:
ECM motor will not run.
Perform the Motor On test.
Motor Runs but the speed does not change.
Perform the Variable Speed Test.
Motor does not turn off.
Perform the Motor Off Test
Motor does not run unless power is removed and restored.
Perform Motor Off Test
Intermittent operation when connected to an automation system
Perform Motor Off Test
Motor Runs, but there is no RPM indication.
Perform the Tachometer Test
A Fast Test…..
If the motor is not running and you want to determine if the EVO/ECM series control is calling for the motor to run,
just measure the DC voltage between the Green and White wires on the motor control cable. If this voltage is
greater than 10VDC, the motor should be running.
Especially if you measure this voltage at the connection to the motor. If you have an instance where the motor
stops intermittently, and it restarts when power is removed then restored, perform this test before removing
power. It will tell you if the intermittent part is the EVO/ECM series control!