90–550 Vmeasuring / supply voltage, 1-phase
15 mA – 6 Acurrent input, X/1 A or X/5 A CT
14relay outputs, common root
144 mmpanel instrument, 138 × 138 cut-out
1
Before you start
The BLR-CX is a reactive power control relay: it measures one voltage and one current, works out the reactive power the network is drawing, and switches up to 14 capacitor steps through contactors K1 … K14 so that the displacement power factor reaches the target cos φ. This page follows the operation manual supplied by Saba Khazen with the relay.
2
Wiring diagram
| Terminals | Function | Range / notes |
|---|---|---|
S1 · S2 | Current measuring | 15 mA – 6 A; any X/1 A or X/5 A CT |
Um1 · Um2 | Measuring and supply voltage | 90 – 550 V AC, single-phase |
M · MS | “All in order” alarm contact | Volt-free relay, closed in order, opens on alarm; 250 V AC / 5 A |
T1 · T2 | Temperature sensor or digital input | Plug-in thermistor; an external temperature or temperature sensor switch can be operated in parallel. Also usable for switching to the 2nd target cos φ (SETUP / 510 and 511) |
A | Interface | TTL on the rear (standard); optional RS485 Modbus, USB |
1 … 14 · 1-14 | Control exits | Up to 14 relays, N/C, common root; 250 V AC / 5 A, 400 V AC / 2 A |
PE | Earth | Connect the earth protection cable to PE on the metal case |
3
Installation and commissioning
- 1Check that the mains voltage and CT current input are suitable for the relay.
- 2Disconnect the panel from mains voltage and check that the voltage is off.
- 3Ensure the CT is short-circuited or not in operation. An open-circuit CT produces a high voltage which endangers people and equipment. It will also damage the CT and affect its accuracy.
- 4Disconnect and remove any previous PFC relay.
- 5Mount the BLR-CX in the control panel with the two mounting clips (cut-out 138 × 138 mm).
- 6Connect the earth protection cable to PE on the BLR-CX metal case.
- 7Connect the BLR-CX according to the wiring diagram (CT/P1 towards the incoming feeder, CT/P2 towards the load).
- 8Remove the short-circuit from the CT.
- 9Connect mains voltage to the panel.
- 10If the relay has been correctly connected and the mains voltage and CT output comply with the ratings and settings of the BLR-CX, the LCD shows
AUTOand the control function starts automatically.
4
FAQ during commissioning
| Symptom | Cause / what to check |
|---|---|
| No indication AUTO — relay does not switch | Relay set to manual operation; in SETUP/100 the selection for PFC is OFF or HOLD; temperature too high; current < 15 mA; voltage or THD U out of tolerance. |
| Indication U ALARM — voltage out of tolerance | Check the settings for nominal voltage (SETUP/Un) and voltage transformer (SETUP/Pt). |
| Indication I Lo ALARM — CT current < 15 mA | Connection error of the CT; the CT short-link has not been removed; the CT ratio is too high compared with the real current; no current. |
| Indication EXPORT — kW export | If there is no real kW export, check the voltage and current connection to the BLR-CX (see Wrong connections / AI). |
| Wrong cos φ indication | Wrong connection: check the voltage and current connection (see Wrong connection / AI). |
| Steps switch in and quickly switch out again | See Step size detection / Defective capacitors. |
| Frequent switching of steps | The size of the capacitors has not been completely detected. |
5
Display and keys
- INFOstep database information
- AUTOrelay is working in AUTO mode
- MANUALrelay is working in manual mode
- SETUPsetup of parameters
- EXPORTkW export
- NT2nd target cos φ is working
- ALARMblinking during alarm
Handling — four keys
Entering a parameter
- ▲ ▼ set the digit; ► selects the next digit.
- After the last digit, ▲ ▼ select the multiplier
k(kilo) orM(mega) and the leading signI(inductive) orC(capacitive) — the letter blinks. - ► stores the setting; ◄ esc aborts the input.
7
Wrong connection, automatic initialising and step detection
A PFC relay demands the correct connection of voltage and current (polarity and phase). If the connection is wrong it must be corrected; as this is not always possible, the BLR-CX offers a manual correction (SETUP/200, reference book) and automatic initialising (SETUP/100/AI).
Automatic initialising (AI)
AI connects and disconnects all control exits several times — this lasts several minutes. Exits that are not connected are set to Foff. Step sizes are not detected by this function. After AI the relay must be checked for correct operation.
- Requirements: voltage within tolerance; CT connected (no simulation); capacitor banks installed and fuses inserted.
- Possible problems: load variations; small current signals (big CT ratio, small steps).
- Failure
AI / Abrt: AI aborted because no clear result could be achieved; PFC = OFF.
Step size detection
At each switching operation the step size is measured (unless disabled in SETUP/300). No c/k setting is needed: the switching sequence selects the steps whose kvar best matches the load. The values are stored in the step database, where the loss of output of each step can be seen. If a step fails during the first 3 operations after a database reset, it is set to Foff automatically.
Defective steps
A step switched 3 times in series without a measured size is detected as defective and blocked for 24 h (step state flashing, status FLty). Check fuses, contactors and capacitors of that step, then reset in SETUP/100/OUt or by restarting the relay.
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Alarms
Alarm settings are in SETUP/500 (reference book). Hold ◄ esc for 5 seconds to reset an alarm.
| Code | Alarm | Meaning / action |
|---|---|---|
U | Voltage | Voltage out of tolerance |
I Lo | Current low | Current < 15 mA — check the current path |
I Hi | Current high | Current > 6 A — CT rating is too small |
PFC | Control | Target cannot be reached — check the panel |
HAr | Harmonics | Limit of THD U is exceeded |
StEP / FLtY | Step | Defective steps |
SPL / Nr | Derating | Step size < 70 % of original — step number and code flash in rotation |
thi | Temperature | Over-temperature — disconnection of steps |
OPH | Maintenance | Max. operation hours reached |
OPC / Nr | Maintenance | Max. switch cycles per step — step number and code flash in rotation |
AI / Abrt | Initialising | Abort of automatic initialising — start AI again at quieter load, or set the phase offset manually (SETUP/200) |
9
Factory default settings (as delivered by Beluk)
SETUP / 100 — for the user (open access)
| Parameter | Default |
|---|---|
| Un | 400 V |
| Ct | 1 |
| Pt | 1 |
| Ai | (no setting) |
| PFC | ON |
| CP1 | 1 |
| St | 10 s |
| OUt | Auto |
SETUP / 200 — measuring (password)
| No. | Parameter | Default |
|---|---|---|
| 201 | nominal voltage | 400 V |
| 202 | CT ratio | 1 |
| 203 | VT ratio | 1 |
| 204 | tolerance voltage | 10 % |
| 205 | Ph-Ph / Ph-N | (automatic) |
| 206 | phase offset | 0° |
| 207 | Ai | (no setting) |
| 208 | countdown with Ai | NO |
| 209 | synchronising | AUTO |
| 210 | temperature offset | 0 °C |
SETUP / 300 — control (password)
| No. | Parameter | Default |
|---|---|---|
| 301 | sensitivity | 60 % |
| 302 | target cos φ 1 | 1.00 |
| 303 | target cos φ 2 | i 0.95 |
| 304 | EXPORT cos φ 2 | NO |
| 305 | switch time delay | 10 s |
| 306 | St step exchange | 2 s |
| 307 | step exchange | YES |
| 308 | step recognition off | NO |
| 309 | lock defective steps | YES |
| 310 | PFC | ON |
| 311 | algorithm | Automatic |
| 312 | kvar offset | 0 kvar |
| 313 | asymmetric St | 1 |
| 314 | Qcap steps off | NO |
SETUP / 400 — step database (password)
| No. | Parameter | Default |
|---|---|---|
| 401 | discharge lock time | 75 s |
| 402 | nominal step size, CT = 1 | 5 var |
| 403 | step type | Auto |
| 404 | switch cycles | 0 |
SETUP / 500 — alarm settings (password)
| No. | Parameter | Default |
|---|---|---|
| 501 | reset manual | NO |
| 502 | THD U alarm | NO |
| 503 | THD U limit | 20 % |
| 504 | THD steps off | NO |
| 505 | delay time THD, temp2 | 60 s |
| 506 | I = 0 freeze PFC | NO |
| 507 | maintenance alarm | NO |
| 508 | limit switch cycles | 262 k |
| 509 | limit operation hours | 65.5 k |
| 510 | target cos φ 2 by DI = 1 | NO |
| 511 | DI = 1 when T1/T2 closed | NO |
| 512 | temperature alarm | NO |
| 513 | temp1 limit | 30 °C |
| 514 | temp2 limit | 55 °C |
| 515 | control alarm | NO |
| 516 | defective steps alarm | NO |
| 517 | derating alarm | NO |
SETUP / 600 — reset (password)
| No. | Function |
|---|---|
| 601 | factory settings |
| 602 | reset step database |
| 603 | reset operation hours |
| 604 | reset APF |
| 605 | reset max. temperature |
| 606 | reset alarm |
| 607 | info software version |
| 608 | change password |
10
Technical data
| Voltage | 90 – 550 V, 1-phase, 50/60 Hz, 6 VA |
|---|---|
| Current | 15 mA – 6 A, 1-phase, < 1 VA |
| Control exits | relay, N/C, common root; 250 V AC / 5 A, 400 V AC / 2 A |
| Temperature measuring | by plug-in thermistor |
| Alarm contact | relay, volt-free, N/C operated; 250 V AC / 5 A, 400 V AC / 2 A |
| Fan control | using a control exit |
| Interface | TTL, rear (standard); optional RS485 Modbus, USB |
| Ambient temperature | operation –20 … 70 °C; storage –40 … 85 °C |
| Humidity | 0 – 95 %, without condensation |
| Overvoltage | class II, pollution degree 3 |
| Connection | screw type, pluggable |
| Case | front: instrument case, plastic; rear: metal |
| Protection | front IP50 (IP54 with gasket); rear IP20 |
| Weight | approx. 0.6 kg |
| Size | 144 × 144 × 58 mm (h × w × d); cut-out 138 (+0.5) × 138 (+0.5) mm |
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