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Instruction Leaflet IL159026EN

Effective February 2022

Replacement instructions  

for CX with CX Plus controller

 WARNING

ENSURE THAT THE UPSTREAM AND INTEGRAL (IF INCLUDED) 

DISCONNECT / OVERCURRENT PROTECTION DEVICE HAS BEEN 

TURNED OFF AND LOCKED OUT. ALSO ENSURE THE CT WIRES 

THAT ARE TERMINATED ON TERMINALS TB1–1 AND TB1–2 ARE 

SHORTED. WAIT AT LEAST 5 MINUTES AFTER DISCONNECTION 

OF POWER SUPPLY BEFORE OPENING THE ENCLOSURE FOR 

SERVICE.

CX controller removal

1. 

For catalog option “W”, remove all caulking around the  

CX controller.

2. 

Remove all wires terminated into the BLR-CX controller, 

ensuring the wire markers do not become removed.

3. 

Open the enclosure door and lift up/pull the slide tabs 

toward you to loosen the controller from its enclosure. 

4. 

The controller can now be removed by gently pushing the 

controller away from the enclosure door.

CX Plus controller installation

1.  P

lace the BLR-CX Plus controller into the slot from  

the BLR-CX. 

2. 

Secure the controller in place using the tab slide-in 

mechanism (similar to the BLR-CX).

3. 

For catalog option “W”, caulk around the CX Plus  

controller (between the facia and the door cutout). 

4. 

Reconnect all the following wires for UM1, UM2,  

A through 12, k and 1.

ote: 

N

Output stages 13 and 14 will not have any wires  

connected to them.

5. 

Remove and discard shorting wires from UM1 and  

UM2 to Lb (or La) and N.

6. 

If this is an AutoVAR Filter, remove the RTF wire from  

Lb (CX) and connect it to UM2 (CX Plus).

7. 

For catalog option “A”, remove the wires from M/MS (CX) 

and terminate it onto the M/MS terminals of the CX Plus. 

Wire extension or rewiring from TB may be necessary for 

this change. 

Re-energizing the unit

1. 

Once all wiring connections are completed, check all 

wiring is secured and tight. 

2. 

Remove the CT shorting link at TB1 terminals 1 and 2. 

3. 

Energize the upstream and/or integral disconnect/ 

overcurrent protection device.

4. 

The CX Plus controller is shown below. 

Figure 1. CX Plus controller

Figure 2. Digital display

Screen legend

INFO 

Capacitor Database

AUTO 

Automatic Mode

MANUAL 

Manual Mode

SETUP 

Setup Mode

ALARM 

Blinking during alarm

NT 

Second target-pf is active

EXPORT 

Export of active energy

1-12 

Capacitor stage number indication

5. 

The CX Plus controller is operated  

by using four keys.

Figure 3.  Operational keys

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