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PFR96/PFR96P
A BRIEF OVERVIEW
h a i b c g d f e a - 3-digit numeric display b - "CAP" and "IND" indicators (CAP = Capacitive, IND = Inductive) c - Step indicator d - "UP" button e - "MODE/SCROLL" button f - "DOWN" button g - "PROGRAM" button h - "AUTO" and "MANUAL" indicators i - Mode indicator
1. General Description
The power factor regulator combines comprehensive operation with user-friendly control setting. It uses numerical techniques in computing the phase difference between the fundamentals of current and voltage, thus precise power factor measurement is achieved even in presence of harmonics.
The power factor regulator is designed to optimize the control of reactive power compensation. Reactive power compensation is achieved by measuring continuously the reactive power of the system and then compensated by the switching of capacitor banks.
The sensitivity setting optimizes the switching speed. With the builtin intelligent automatic switching program, the power factor regulator further improves the switching efficiency by reducing the number of switching operations required to achieve the desired power factor.
Usage of the capacitor bank is evenly distributed by the intelligent switching algorithm. This ensures uniform ageing of the capacitors and the contactors used.
The four-quadrant operation feature allows the power factor regulator to operate correctly in the case of active power feed back to the mains where regenerative power sources are used.
Current transformer (CT) polarity is important in determining the correct phase angle difference between the current and voltage hence the power factor. This power factor regulator will automatically correct the CT polarity internally in the event that the polarity is reversed.
2. Light indication
The regulator has a 3-digit numeric display and several light indicators of which can be functionally divided into 3 categories:i. Metering functions - power factor & current.
ii. Control parameters functions - power factor, C/K, sensitivity, reconnection time, rated step & switching program .
iii. Alarm messages function.
1
To access the above functions, press the "MODE/SCROLL" key until the light indicator is indicating the desired function. The 3-digit numeric display will show the value of the selected function. If there are sub-functions on the selected function such as the function for
"rated step" & "alarm messages", press the "UP" or "DOWN" arrow key to access these sub-functions.
Press "MODE/SCROLL" Press "UP" or "DOWN"
Power Factor
Measurement
Current
Measurement
Power Factor
Setting
C/K
Setting
Sensitivity
Setting
Step 1
Coefficient
Step 2
Coefficient
Step 3
Coefficient
Step 4
Coefficient
Step 5
Coefficient
Step 6
Coefficient
Reconnection
Time Setting
Rated Steps
Stepping
Switching
Program Setting
Alarm
Alarm Message 1
Alarm Message 2
Alarm Message 9
Figure 1: Display Structure
3. Metering function
3.1 Power Factor
Upon powered up, the numeric display indicates the measured power factor of the system. If the "IND" LED lights up, it means the system is having inductive power factor. On the other hand, if the
"CAP" LED lights up, it means the system is having capacitive power factor.
If the power factor regulator detects a re-generative condition where the energy flow is reversed, the power factor display will show a minus sign in front of the power factor reading.
When the load current is below the operating range and the power factor cannot be measured accurately, the numeric display will show
"---".
If the power factor regulator has been previously set to other display function, it will automatically return to this power factor display function if no key is pressed for more than 3 minutes.
3.2 Current
This function display mode is indicated by the "CURRENT" light indicator. The numeric display shows the true-rms value of the secondary current measured by the 5A current transformer (CT).
Example:
If a 1000/5A CT is used and the display shows "2.50", the primary measured current is 500A.
4. Control Parameters
4.1 Target Power Factor (SET Cos )
This set the targeted power factor required when the system is under automatic mode. The power factor regulator will switch the capacitors in or out in order to achieve this set value.
4.2 C/K
This setting is used to set the switching hysteresis and it is calculated based on the smallest size capacitor used.
With automatic C/K selection(C/K set to AtC), the reactive power compensation is achieved without C/K setting. The PFR will measure and evaluate all steps available when necessary and C/K value is then computed.
The C/K value can also be obtained manually from table 1 or calculated with the following formula :-
C/K
=
Q ´ 5
3 ´ V ´ I
»
2.88
´ Q
V ´ I where Q = smallest capacitor step (var)
V = nominal primary system voltage (V)
I = primary rating of the current transformer (A)
Example:-
If Q= 15kvar; V= 415V; I= 800A
=> C/K = (2.88 x15000)/ (415 x 800) = 0.13
C.T.
50
60
75
100
150
200
250
300
: 5
: 5
: 5
: 5
: 5
: 5
: 5
: 5
: 5 400
500
600
800
1000
1500
2000
: 5
: 5
: 5
: 5
: 5
: 5
2.5
0.35
0.29
0.23
0.17
0.23
0.12
0.14
0.07
0.04
0.03
5
0.70
0.58
0.46
0.35
0.23
0.18
0.14
0.12
0.09
0.07
0.06
0.04
0.03
10
1.16
0.93
0.70
0.46
0.35
0.28
0.23
0.17
0.14
0.12
0.09
0.07
0.05
0.03
15
C/K - Value for 415V
Smallest Capacitor in ( kvar )
20 25 30 40
1.04
0.70
0.52
0.42
0.35
0.26
0.21
0.17
0.13
0.10
0.07
0.05
0.93
0.70
0.56
0.46
0.35
0.28
0.23
0.17
0.14
0.09
0.07
1.16
0.87
0.70
0.58
0.43
0.35
0.29
0.22
0.17
0.12
0.09
1.04
0.83
0.70
0.52
0.42
0.35
0.26
0.21
0.14
0.10
Table 1: C/K Table for 415V
1.11
0.93
0.70
0.56
0.46
0.35
0.28
0.19
0.14
50
1.16
0.87
0.70
0.58
0.43
0.35
0.23
0.17
60
1.04
0.83
0.70
0.52
0.42
0.28
0.21
100
1.16
0.87
0.70
0.46
0.35
150
1.04
0.70
0.52
Note: (i) During automatic C/k measurement(C/K set to AtC), any step with C/K value lower than
0.03 may not be detected and will be excluded from the controlling process.
(ii) The user may encounter non-optimized regulating during the initial stage before the C/K value is determined.
4.3 Sensitivity
This parameter set the speed of the switching. A larger sensitivity value will result in slower switching speed and conversely, a smaller sensitivity value will result in a faster switching speed. This sensitivity applies to both switching on and switching off of the capacitor.
Example:- If smallest step, Q
1st
Scenario 1:
= 15 kvar; Sensitivity= 60 s/step
Reactive power required to achieve set power factor, Q rq
= 15 kvar
Step required to achieve target power factor = Q
= 15kvar/15kvar rq
/ Q
1st
= 1 step
Reaction time = 60/1 = 60 sec
Scenario 2:
Reactive power required to achieve set power factor, Q rq
= 45 kvar
Step required to achieve target power factor = Q
= 45kvar/15kvar rq
/ Q
1st
= 3 steps
Reaction time = 60/3 = 20 sec
4.4 Reconnection Time
This is the safety lockout time which is used to prohibit the reconnection of the same capacitor step before it is fully discharged.
This parameter is usually set larger than the discharge time of the largest capacitor size in used.
2
4.5 Rated Step
Every step in the power factor regulator is programmable except
Step 1. Step 1 is fixed as "1" and it is the smallest capacitor step used.
All other steps were programmed as multiple of Step 1.
Example:
If the configuration of capacitors used, starting from Step 1, is 10kvar,
10kvar, 20kvar, 20kvar, 30kvar, 30kvar, 60kvar & 60kvar, then the rated steps are 1,1,2,2,3,3,6,6.
Unless all steps are fully used, the unused steps should be set as
"000". The last step can be programmed as alarm/fan output by setting the step to "ALA" /"FAn". When the last output is programmed as alarm output, second last output can be programmed as fan output.
During the programming of the "Step", the corresponding light indicator for that selected step will light up. Example, number "1" light indicator indicates rated step for contact output number 1.
If the automatic C/K mode is enabled, the PFR will carry out the automatic rated step measurement. Therefore, all steps are not programmable except alarm/fan output.
4.6 Switching Program
This setting allows the selection of one of the four available switching algorithms.
a) Manual switching (n-A):
When this switching program is selected, the capacitor steps are controlled manually by the "UP" or "DOWN" keys. The "UP" key will connect the capacitor step and "DOWN" key will disconnect the capacitor step. Steps are switched in a rotational manner based on first-in-first-out basis.
b) Rotational switching (rot):
This switching program is similar to the manual switching method and it is based on rotational first-in-first-out sequence. Unlike the manual switching program, this option will automatically switch in and out the capacitors according to the targeted power factor, sensitivity setting and the reconnection time setting.
c) Automatic switching (Aut):
This automatic switching program uses intelligent switching sequence. The step switching sequence is not fixed and the program automatically selects the most appropriate steps to switch in or out in order to achieve shortest reaction time with minimum number of steps. For equal ageing of the capacitor and contactors, the program will select the least used step to be switched in if there are two equally rated steps.
Under this switching program, the power factor regulator automatically detects the CT polarity during power up. Once this polarity reference is fixed, any subsequent re-generative power condition detected will cause all the capacitor steps to be disconnected.
d) Four-quadrant switching (Fqr):
This switching program is similar to the automatic switching program (Aut) except that this switching program allows the power factor regulator to operate correctly under both import power and export power (re-generative) conditions. Under export power condition, the active power is fed back to the supply mains by other energy sources such as solar power etc. If this option is selected, the installer must ensure that the CT polarity is correctly wired because the automatic CT polarity correction detection feature is disabled.
The "Manual" light indicator on the power factor regulator lights up if the switching program is set to Manual switching (n-A). For
Rotational (rot), Automatic (Aut) and Four-quadrant (Fqr) switching programs, the "Auto" light indicator on the regulator lights up.
Under normal operating condition, the step indicators indicate the
ON/OFF status of every step. A steady ON light indicates the particular step is switched in. A blinking light indicates that the particular step is required to switch in but unable to do so temporary due to reconnection time lockout.
Please note that all the steps will be disconnected if the power factor regulator detects a re-generative condition under Rotational
(rot) or Automatic (Aut) switching program.
4.7 Procedure for Setting the Control Parameters
Step 1: Select the required item by stepping through all the items using "MODE/SCOLL" key. The corresponding indicator of the selected item will be lit. For "Rated step" setting, the individual output can be selected via the "UP" or "DOWN" keys, the step indicator corresponds to the step number.
Step 2: Press the "PROGRAM" key once, the indicator of the selected item will blink to indicate that the system is now in programming mode.
Step 3: Use the "UP" or "DOWN" keys to select the desired value.
Step 4: To save the selected value, press the "PROGRAM" key once, the indicator stop blinking and the setting is saved.
To abort without saving the selected setting, press the
"MODE/SCROLL" key.
Control
Paramenter
Indication
LED
Target power Factor SET Cos
C/K
Sensitivity
Reconnection Time
C/K
SENSITIVITY
RECON TIME
Rated Step : Step 1
Step 2
STEP
LED*
1
1
2
Setting
Range
0.80 Ind - 0.80 Cap
0.03 - 1.20/AtC
5 - 300 s/step
5 - 240s
001- 002 - 003 - 004 -
005 - 006 - 008 - 012 -
016
Default
Factory
Setting
0.98 Ind
AtC
45 s/step
30s
RATED STEPS 000 - disable
ALA*
2
- alarm ouput
FAn*
4
- fan output
001
Step 6
Switching Program SWITCH PROG
6
n-A - rot - Aut - Fqr Aut
*1- Under normal operation except for rated step display, the step indicator indicate step
ON/OFF status
*2- Only last output can be configured as alarm output
*3- Last output can be configured as fan output, or second last output can be configured
as fan output only when last output is configured as alarm output.
Table 2: Parameters setting
4.8 Reset To Factory Default Setting
To reset all programmable parameters to factory default, first power off the power factor regulator. Press the "UP" & "DOWN" keys simultaneously while turning on the power and hold it for more than
5 sec until the display flashes "dEF" for 5 sec. Now the power factor regulator is restored to factory default setting.
5. Fan Output
When the fan output is selected, the output will be energized with any capacitor bank switched ON.
6. Alarm
Alarm conditions detected by the power factor regulator are indicated by the flashing "ALARM" light indicator. The last step of the regulator, if required, can also be selectively programmed as alarm contact in addition to the "ALARM" indicator. This additional alarm contact is normally open and it closes when alarm is activated.
To view the alarm message, press the "MODE/SCROLL" key until the
"ALARM" function is selected. The numeric display will show the alarm message as according to Table 3 below. If more than one alarm messages are recorded, press the "UP" or "DOWN" keys to view the others. The alarm indications are automatically reset to normal once the alarm conditions are restored.
3
Alarm
Message
Lol
Hil
LoU
HiU
UCo
OCo
ESt
ECt
Description Delay time
Activate Deactivate
10 s 5 s Current lower than 3% rated value
Current exceed 110% of rated value
2 min 1 min
Voltage lower than 85% of 100 ms rated value *567
Voltage exceed 110% of
5 s
15 min 7.5 min rated value *567
All capacitors are connected and the power factor lower than set power factor
All capacitors are disconnected and the power factor higher than set power factor
Auto C/K or rated step measurement error
Manual setting required
Automatic CT polarity detection error
15 min 7.5 min
15 min 7.5 min
- -
- -
Action
-
*
4
All steps disconnected
-
-
-
-
-
-
Alarm outputs
LED Relay
Blinks -
Blinks On
Blinks On
Blinks On
Blinks On
Blinks On
Blinks -
Blinks -
*4- Automatic switching of steps are prohibited when this alarm occurred.
*5-For PFR96 110~120V model, LoU is 94V & HiU is 132V
*6-For PFR96 220~240V model, LoU is 187V & HiU is 264V
*7-For PFR96P 380~415V model, LoU is 323V & HiU is 456V
Table 3: Alarm table
7. Automatic CT polarity detection
During the power on start-up process, the power factor regulator, if programmed under Rotational or Automatic switching program, detects the CT polarity and corrects it internally if the CT polarity is reversed. If the power factor regulator is set for Four-quadrant switching program, this feature is disabled.
8. Programming Lock
The power factor regulator is equipped with a programming lock to prevent inadvertent changes to the control parameters. If locked, all the control parameters can only be viewed at and cannot be changed without unlocking it first.
To lock or unlock, first ensure that the display is on the power factor display function mode, then press "PROGRAM" key once followed by
"DOWN" key immediately. Hold the "DOWN" key until the numeric display flashes "LOC" or "CLr". "LOC" indicates the power factor regulator is locked and "CLr" indicates the regulator is unlocked.
9. Technical Data
9.1 Auxiliary Supply
Model PFR96S : 110~120VAC / 220~240VAC
Model PFR96P : 380~415VAC
Operating Limits : -15% + 10%
Consumption : 10VA max
Frequency : 50Hz or 60Hz
9.2 Current Input
Rated current , l n
: 5A
Operatings Limits : 0.15A - 6.5A
Rated Frequency : 50Hz or 60Hz
9.3 Relay Output
Numbers of outputs : 6
Contact arrangment : NO contact type
Rated capacity : 5A 250VAC (Cos ϕ = 1)
Max current for the : 12A continuous
common terminals
9.4 Control Range
Power factor setting : 0.8 inductive - 0.8 capacitive
C/K setting : 0.03 - 1.00
Switching sensitivity : 5 - 600 s/step
Reconnection time : 5 - 240 s
for same step
Switching Program : Automatic / Automatic Rotate / Manual/
Four- quadrant
Rated step coefficient : 0 / 1 / 2 / 3 / 4 / 6 / 8 / 12 /16
9.5 Mechanical
Mounting : Panel mounting
Dimension ( h X w X d) : 96mm X 96mm X 70mm
Approximate weight : 0.6 kg
10.Typical Application Diagram
10.1 Diagram 1 - Without external discharge resistors for
110~120VAC / 220~240VAC
N
MAIN
L3 L2 L1
FUSE
P1
P2
8
7
6
5
4
3
2
1
CURRENT
/5A
6
5
4
3
2
1
16
15
14
13
12
11
10
9
FUSE
K1 K5 K6
10.3 Diagram 3 - For PFR96P
N
MAIN
L3 L2 L1
FUSE
P1
P2
8
7
6
5
4
3
2
1
CURRENT
/5A
4
3
2
1
6
5
FUSE
16
15
14
13
12
11
10
9
LOAD
10.2 Diagram 2 - With external discharge resistors for 110~120VAC / 220~240VAC
N
MAIN
L3 L2 L1
FUSE
P1
P2
8
7
6
5
4
3
2
1
CURRENT
/5A
4
3
2
1
6
5
16
15
14
13
12
11
10
9
FUSE
K1 K5
External resistor
External resistor
K6
LOAD
11. Case Dimensions
9 6 mm
Fr o n t
90mm
70mm 90mm
External resistor
*Mikro Bhd reserves the right to make changes without futher notice to any products herein to improve reliability, function or design.The figures shown are without obligation.
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