6
ECM Motor - troubleshooting Manual
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ECM MOTOR
TROUBLESHOOTING
BAS Common (
NOTE:
Same as 24 VAC Common)
BAS Input Type Voltage or Current - Shown set to voltage
Control Cable Jacks
BAS Positive Input (MAX +10 VDC)
24 VAC HOT Power
24 VAC Common (
NOTE:
Same as BAS Common)
NOTE:
BAS Common is connected to 24 VAC Common. If 24
VAC is earth grounded then BAS Common will be earth ground
as well. Polarity must be observed when connecting multiple
speed controllers and transformers.
FIGURE 3 - ECM STANDARD SPEED CONTROLLER
LED blink Sequence Chart
The Diagnostic LED will blink out the current status used to
determine if the speed control is operating in manual/BAS
mode, and if current setting is OFF or CONTROL.
*
NOTE:
BAS input of less than 1 volt means controller is in
manual (POT adjust) mode.
Blink
Mode
Voltage
1
Manual Mode
(POT adjust) - OFF
0 - 1 VDC
(at POT taps)
2
Manual Mode (POT
adjust) - Control 0-100%
1 - 5 VDC
(at POT taps)
3
BAS Mode
(1-2 VDC signal) - OFF
1 - 2 VDC
(at BAS taps)
4
BAS Mode (2-10 VDC
signal) - Control 0-100%
2 - 10 VDC
(at BAS taps)
LED On
Steady
of stays
OFF
Fault Mode
• Measure input voltage – ensure 24 VAC
+/- 10%
• Check wiring to speed control (ensure 24 VAC
HOT and Common are not reversed)
• Cycle 24 VAC power to unit
• Check BAS input wiring –
NOTE:
‘BAS –‘ and
24 VAC Common are connected – observe
polarity when interfacing to other systems
Standard Speed Controller Hardware Specifications
Power
24 VAC +/- 10% @ 50/60 Hz (2 VA)
Operating
Conditions
0°C to 50°C (32°F - 122°F) 0% - 95% R.H.
Noncondensing
Storage
Conditions
-30°C - 50°C (-22°F - 122°F) 0% - 95%
R.H. Noncondensing
Processor
8-bit flash microcontroller with on board
Analog to Digital Converter
Inputs
2 Analog (1 manual adjust dial and 1 BAS
0-10 VDC)
Outputs
3 Digital (GO signal to ECM and Vspd PWM
signal @80.0 Hz) and LED
Connections
¼” Spade Terminals – Recommend 18-22
AWG copper wire
Dimensions
53.3 mm by 43.2 mm (2.1” by 1.7”)
Weight
45.4 grams (0.1 lbs)
