Engine control module (ecm), 1 2 j6, 4 ecm input voltage and line sense configurations – Alpha Technologies ECM User Manual

Page 38

744-862-C0-003 Rev.C

Engine Control Module (ECM)

4.4

ECM input voltage and line sense configurations

The ECM has 120/240VAC input voltage and line sense capabilities, which

must be configured separately. The ECM PCBA part number 704-630-XX must be

configured for 120/208/240VAC line sense via DIP Switch SW5-5 and SW5-6 as

shown in table 4-1. The default setting is 120VAC. The logic transformer (T1)

located on the GRI power board part number 704-634-XX must also be configured

for the correct input voltage by installing zero ohm jumpers R1-R4. Install R1 & R2

for 120VAC operation or R3 & R4 for 240VAC operation as shown in figure 4-4. The

default setting is 120VAC. The following two options are provided for clarification:

Option 1 (Recommended)

Configure ECM power board for an input voltage of 120VAC by installing R1 &

R2 and removing R3 & R4 (default). Configure DIP SW5 on the ECM board for either

120VAC or 240VAC line sense depending on the input voltage configuration of

the XMS2 power supplies being used. In other words, always power the ECM with

120VAC and set DIP SW-5 for the input voltage of the XMS2 power supplies being

used (120VAC or 240VAC). As long as SW-5 is set correctly, the ECM will properly

scale the voltage for status monitoring purposes.

Install the 120VAC power cable (y-adapter) to both the input line sense of the

ECM and the input power to the ignition battery charger (L1 to neutral) as shown

in Figure 4-3. This is the preferred configuration since the battery charger is only

rated for 120VAC operation and the ECM’s default configuration is 120VAC. The

120VAC ignition battery charger is only used on the 2.7/3.0kW APUs.

Note: The ECM will properly sense a line loss on a 240VAC (L1-L2) system even

though it’s only monitoring 120Vac (L1-Neutral) as long as SW-5 is set for 240VAC.

This is based on the fact that the ECM is monitoring the secondary winding of a

centered tapped single-phase transformer from utility power.

Option 2

Configure the power board jumpers R3 and R4 and the DIP SW-5 on the ECM

for 240VAC operation. Install a 240VAC line sense cord for the ECM and a separate

120VAC power cord for the ignition battery charger. When R1 and R2 are installed,

VAC=120. When R3 and R4 are installed, VAC=240.

1
2

120/240VAC

AC LINE

SENSE

120/240V

240V

120V

12V

250mAMP 250V SB

240 V

(p/n 704-634-XX)

Fig. 4-5 ECM Power Board