Novar NOVAR 300 Manual
2005
NOVAR 300
Capacitor Controller for
Power Factor Correction
Operation & Maintenance Manual
NOVAR_CM
Issue: March 2005
NOVAR 300 Operation & Maintenance Manual NOVAR_CM
Page 2 of 29
CONTENTS
1. INTRODUCTION..................................................................................................................................3
1.1 APPLICATION....................................................................................................................................3
1.2 DESCRIPTION AND OPERATION ...................................................................................................6
2. TECHNICAL SPECIFICATION ...........................................................................................................7
2.1 RATINGS, OPERATING RANGES & FEATURES...........................................................................7
2.2 ELECTROMAGNETIC COMPATIBILITY (EMC) ............................................................................11
2.3 EUROPEAN LOW VOLTAGE DIRECTIVE (LVD)..........................................................................11
3. COMMISSIONING .............................................................................................................................12
3.1 SYSTEM CONNECTIONS ..............................................................................................................12
3.2 USER ADJUSTMENTS ...................................................................................................................13
3.3 SETTING OF DUAL-IN-LINE SWITCH ...........................................................................................15
3.3.1 Sequence ..................................................................................................................................15
3.3.2 Safety Lockout Time .................................................................................................................16
3.3.3 Stage Limit.................................................................................................................................17
3.4 SETTING OF C/K VALUE................................................................................................................18
3.4.1 Examples of Calculation and C/K Settings...............................................................................18
3.5 SETTING OF TARGET COS PHI....................................................................................................19
3.6 CONNECTION ERRORS ................................................................................................................20
3.7 USE OF EXPANDED DISPLAY ......................................................................................................20
4. FAULT FINDING AND TEST PROCEDURES.................................................................................22
4.1 FAULT FINDING ..............................................................................................................................22
4.1.1 Connection error .......................................................................................................................22
4.1.2 Low system voltage...................................................................................................................22
4.1.3 System current errors................................................................................................................22
4.1.4 Incompatible settings ................................................................................................................22
4.1.5 Factory programmed settings ...................................................................................................22
4.1.6 Input magnitude errors and transients......................................................................................23
4.1.7 Internal NOVAR hardware fault ................................................................................................23
4.1.8 Perceived software fault............................................................................................................23
4.1.9 Capacitors permanently connected..........................................................................................23
4.1.10 Hunting ....................................................................................................................................23
4.2 TEST PROCEDURES .....................................................................................................................24
4.2.1 Test equipment..........................................................................................................................24
4.2.2 Test sequences.........................................................................................................................24
5. SERVICING........................................................................................................................................26
5.1 OUT OF SERVICE...........................................................................................................................26
5.2 IN SERVICE .....................................................................................................................................26
5.3 FITTING OF LOCKABLE FRONT COVER.....................................................................................27
6. CIRCUIT DESCRIPTION...................................................................................................................28
NOVAR 300 Operation & Maintenance Manual NOVAR_CM
Page 3 of 29
1. INTRODUCTION
There is a warning symbol on the equipment, an exclamation mark within a triangle. This
warns the user to refer to the operation and maintenance manual before commissioning,
installing or operating the equipment.
WARNINGS
1. Installation, commissioning and maintenance should only be carried out by suitably
qualified personnel.
2. Terminations exposed during installation, commissioning and maintenance may
present a hazard unless the equipment is electrically isolated.
3. The equipment should only be operated as intended e.g. with the covers in place,
and within the specified electrical and environmental limits.
1.1 APPLICATION
Many power utilities world wide apply financial penalties to industrial consumers of electrical
energy when inductive loads are connected. The established solution for compensating
inductive loads is to apply power factor correction (PFC) by switching capacitors on to the
system. To optimise the operation of PFC, and realise maximum benefits and cost savings,
a means of controlling the capacitor switching is necessary.
NOVAR 300 works by continuously measuring the system's kvar component and then
switching the optimum quantity of capacitor compensation in, or out, to achieve the desired
power factor.
NOVAR 300 uses true rms measuring techniques together with appropriate mathematical
calculations in preference to mean sensing and zero crossing detection which has proved
inaccurate on systems with distorted waveforms.
The NOVAR 300 should be connected to the system as shown in the appropriate diagrams
(Figures 1 and 2).
NOVAR 300 Operation & Maintenance Manual NOVAR_CM
Page 4 of 29
11
12
13
14
15
16
5
6
7
8
9
10
23
24
25
26
27
28
17
18
19
20
21
22
432129
7
8
9
10
11
12
A
B
C
30
1
2
3
4
5
6
P1
S1 S2
P2
To Load
Alarm
(if fitted)
For contact pairs fitted
see number of stages
FIGURE 1 - Wiring diagram for volt free contacts
NOVAR 300 Operation & Maintenance Manual NOVAR_CM
Page 5 of 29
432129
A
B
C
30
11
12
13
14
15
16
4
5
6
P1
S1 S2
P2
To Load
Alarm
(if fitted)
5
6
7
8
9
10
1
2
3
Common
28
27
26
25
24
23
12
11
10
22
21
20
19
18
17
9
8
7
For contact pairs fitted
see number of stages
FIGURE 2 - Wiring diagram for common contacts
NOVAR 300 Operation & Maintenance Manual NOVAR_CM
Page 6 of 29
1.2 DESCRIPTION AND OPERATION
Multi-stage controllers are available in standard units of 6 and 12 stages. These provide up
to 12 pairs of "volt-free" contacts.
The following switches are mounted on the controller front panel :
* An auto/manual control (upper button)
* A directional control marked +, 0, - (lower button)
* A ten-way programme selector switch
Depressing the auto/manual switch causes the Controller to enter MANUAL mode as
indicated by the LED adjacent to the switch. Capacitor stages can be switched 'in' by
pressing the directional control button once. Pressing this button once more places the
Controller in the MANUAL 'off' position and no further stages will be switched 'in' or 'out'.
Pressing this button once more will result in capacitor stages being removed until pressed
again. the three LED's associated with this button will, at all times, indicate the operational
mode.
When capacitors are being connected, a LED associated with the inductive (IND) control
lights. As they are being disconnected, a LED associated with the capacitive (CAP) control
lights.
The ten-way selector switch is used to select:
* The time interval between steps
* The sequence in which the stages are connected
* The limit which determines the number of steps taken in the sequence selected.
These are detailed in section 3.3.
NOVAR 300 Operation & Maintenance Manual NOVAR_CM
Page 7 of 29
2. TECHNICAL SPECIFICATION
2.1 RATINGS, OPERATING RANGES & FEATURES
Voltage Rating (Vn) 110 V, 120 V, 415 V, 480 V.
Others available in range 63.5 V to 500 V max.
Current Rating (In) 1 A or 5 A. Others available in the range 0.5 A to 5 A max.
Input Connections IA, VBC, or IB, VCA or IC, VAB
IR, VYB, or IY, VBR or IB, VRY,
IR, VST, or IS, VTR or IT, VRS.
Line Current Transformers Class 1, 5 VA
Operating Ranges
Voltage 85 ... 110 % Vn
Current 0...120 % In
Frequency 50/60 Hz
Humidity 0...93 % +2 % -3 % Relative (non-condensing)
Temperature Range Storage: -40... 80°C
Operating: -10... 55°C
Settings c/k 0.03...1.00
cos phi 0.80...1.00...0.95 leading
Overload Ratings 1.5 x Vn for 10 seconds
2 x In continuously
20 x In for 3 seconds
Isolation The controllers will withstand:
2 kV rms, 50/60 Hz for 1 minute between:
- all terminals to case
- current terminals to all others
- voltage terminals to all others
- output contact pairs (Volt Free versions)
Impulse Voltage Test The controller will withstand:
5 kV 1.2/50 us, 0.5J, to BS923 and IEC 255-22-1 between:
- all terminals and case
- current input terminals
- voltage input terminals
- output contacts (open)
- any pair of independent circuits
Output and Alarm contact
rating
Make 1250 VA, 500 V a.c. resistive
Carry 5 A a.c.
Break 5 A a.c.
Type: one normally open
NOVAR 300 Operation & Maintenance Manual NOVAR_CM
Page 8 of 29
2.1 RATINGS, OPERATING RANGES & FEATURES (cont.)
No-volt release All output contacts are disabled within 15 ms. After the
supply voltage is restored, normal operation is resumed,
and the outputs are energised in sequence after the
appropriate safety lockout time has elapsed.
Burdens Current circuit: 0.2 VA at In
Voltage circuit: 9 VA (6 stages energised)
15 VA (12 stages energised)
Net weight All models: 1.5 kg
Terminals Barrier type: M3.5
Plug-in wire size: 1...2.5 mm2(18...14 AWG)
Switching style Rotational or linear (see Figure 3). Selected at time of
order. Rotational switching evens the contactor wear (for
the largest step size only) and generally reduces the
system response time. It is implemented for all sequences
on NOVAR 300, if requested.
Intelligent switching If twice the minimum capacitor size (or more) is required,
then the NOVAR will switch in a double step. This applies
for all sequences. For sequence 00 (1:1:1:1), the second
capacitor will be connected after an additional delay of two
seconds.
Limit selection Up to 12 plus alarm output. The maximum possible for any
configuration is determined by the number of relays fitted
and the selected sequence. If the selected value is too
high, the unit will automatically override it to the highest
allowable value.
Safety lockout The time required to safely discharge a capacitor can be
set to any of 8 different values. The NOVAR will not allow
any capacitor to be re-energised until this time has
elapsed.
Providing that the safety lockout time has passed, the
capacitor can be called after one fifth of the programmed
time. It is not possible to override this lockout time.
NOVAR 300 Operation & Maintenance Manual NOVAR_CM
Page 9 of 29
2.1 RATINGS, OPERATING RANGES & FEATURES (cont.)
Exit from manual The AUTO/MAN button allows the user to switch between
automatic and manual operating mode as required.
To safeguard against leaving a system indefinitely in
manual mode, an automatic exit has been included. This
will return the operating mode from manual to automatic
five minutes plus the selected safety lockout time after the
last manual mode operation. Relevant manual mode
operations are pressing the lower button and operation of
an output relay.
Models without the automatic exit from manual are
available.
Alarm output Signals failure to meet target cos ϕ
See also Self Test
Self Test At reset and every ten minutes in operation, the NOVAR
executes an internal hardware check for correct
functioning. During this process, the model number will be
displayed.
If the unit fails this self test, the IND and CAP LEDs are
toggled and the alarm relay (if fitted) is also “flashed “ in
time with this.
NOVAR 300 Operation & Maintenance Manual NOVAR_CM
Page 10 of 29
1 1 1 1 1 1
2 2 2 2 2 2
3 3 3 3 3 3
4 4 4 4 4 4
5 5 5 5 5 5
6 6 6 6 6 6
1
2
3
4
5
6
Capacitors
connected
Switching steps Time
ROTATIONAL SYSTEM RESPONSE
1 1 1 1 1 1
2 2 2 2 2 2
3 3 3 3 3 3
4 4 4 4 4
5 5 5
6
1
2
3
4
5
6
Capacitors
connected
Switching steps Time
LINEAR SYSTEM RESPONSE
1
2
1
3
2
1
2
1 1
FIGURE 3 - Rotational/linear capacitor switching
Tabla de contenidos
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