Standarddescription of
CONSTANT CURRENT REGULATOR TYPE CCR 951
List of contents:
A. General Description
B. General Data's and Functions C. CCR Working Principle D. Specifications
A. General Description.
Induperm Constant Current Regulator type CCR 951 has been specially developed
for the supply of power to lighting systems at airports with their special demands for
rehability, accuracy and easy maintenance.
In its Standard design CCR 951 is intended for lighting systems built up according to
the series principle, but on demand it can be supplied for parallel systems, too. Induperms CCR type 951 is constructed on the basis of the newest experiences
in the semiconductor field.
This means compact construction and easy adaptation to operational demands as well as to individual demands for special features.
The CCR lay-out can be divided into three basic parts:
a.1 The Electronic Section. a.2 The Power Board Section.
a.3 The Out-put Transformer Section.
a.1 The Electronic Section
The electronics is built into a standard 19" cassette where the wiring between the connectors for each individual printed circuit is done by means of Wire- wrap.
The electronics are fitted on printed boards in order to provide fast and efficient
service. Each individual printed circuit is provided with a front plate where
adjustment potentiometers, measuring (test) points, light diodes and switches
are located. The electronic modules also contain the necessary switches for
local operation, as well as the CPU Monitoring unit for display of current,
voltage, power etc. A front view of the electronic cassette, fully equipped with
all functions and for seven individual adjustable light intensity steps, is shown
on drawing 951.1x2-x.
a.2 The Power Board Section.
The power board section consist of two boards, one with all low tension power
components, such as contactors, thyristors, noise suppressing coils etc.,
and the other with all high voltage components, such as current and voltage
a.3 Output Transformer Section
The Out-put Transformer Section consists of the high voltage output
transformer itself as well as a noise suppression coil, fuses for the electronics,
terminals etc.
B. General specification and functions.
b.1 Power Rating.
The standard output power range is:
3-5-7,5-10-12,5-15-20-25KVA. The output transformer are designed so that
these output values can be maintained with 90% of nominal input voltage.
Each output transformer has the following tappings:
30 - 40 - 50 - 60 - 70 - 80 - 90 - 100% of nominal output.
b.2 Input Voltage.
In its standard version, CCR 951 may be designed for the following nominal
input voltages (50 or 60Hz sinus):
- 400 V AC ± 10%
- 415 V AC ± 10%
b.3 Output Current.
In its standard version, CCR 951 can be designed for the following nominal output Currents: 6,6A - 10A - 20A.
Other output current values upon request.
b.4 Ambient Temperature.
The CCR 951 is designed to operate in temperatures ranging from
+5°C to +45°C.
If the ambient temperature demands exceed 45°C, the CCRs will be equipped
with an internal fan for maximum ambient temperatures of +55°C.
The CCRs can be stored and transported in temperatures ranging from
-5°C to +45°C.
b.5 Other Electrical Specifications.
b.5.1 Power Factor, PF
PF uncompensated, better than 0.85 ind.
at 100% load, (resistive), and 90% of nominal input voltage.
See curves on datasheet.
b.5.2 Efficiency, h
The Efficiency depends on the size of the CCR, one or two phase
inputs, but is app. 92-97%.
b.6 Input Current Calculation.
The maximum input Current can be calculated as follows:
Iinp.,max. = Actual load (W)
0,9 x Uinp.,nom. x h x PF,load
b.7 Circuit Selector Switch.
The electronics of CCR 951 are designed so that they may be extended to
operate a system with two light directions, or for more Taxiways (built-in Circuit-Selector).
b.8 Light Intensity Steps.
Each light intensity step is individually adjustable from 0 to 100% light.
The CCR 951 can be ordered with 1,3,6 or 7 steps.
b.9 Remote Control.
CCR 951 can be ordered for two different Remote Control modes:
b.9.1 Parallel control,
meaning a number of Terminals, each with a well-defined command,
backindication or alarmfunction, galvanic separated from the CCR
itselves. Operated by means of an external 24V DC supply.
b.9.2 Seriel control (RS-485)
via special computerinterface, where the protocol can be individually
agreed upon.
C. CCR WORKING PRINCIPLES.
Before a more detailed explanation of each individual electronic module in the cassette is given, a general explanation of the working priciples of the CCR will be presented. This explanation is based on the principle diagram,
c.1 The Power circuit.
The power circuit is indicated by the heavy line, starting with the mains input terminals. If the main contactor is activated, mains is connected to the (Multi) thyristorblock. These thyristors will lead a variable part of each half wave through to the output transformer. The size of this part is determined by the
"Trigger" signals from the Trigger Unit.
This principle is shown on drawing 951.015 and for the multithyristor system
on Drawing 951.015-1 The resulting input voltage on the output transformer
generates A secondary output voltage according to the voltage ratio of the output transformer. This voltage generates a current in the series circuit
impedance. The size of the series current is measured by the feedback current
transformer, and the signal will proceed to the electronics.
c.2 The Regulation Circuit.
The desired current in the series circuit is maintained by a closed loop
regulation circuit. This circuit contains a regulation amplifier (the Slope
Controller Unit), a unit which activates the thyristors (the Trigger unit), a
feedback amplifier (the RMS-unit), as well as the thyristors, the output transformer, and the feedback current transformer (as mentioned before). c.2.1 The system works as follows:
When the CCR is switched on, a DC-voltage from the Ref. Unit
connected to one of the two differential inputs in the Slope controller. As the current in the series circuit is zero, the input signal on the other
input in the Slope Controller Unit is zero. This means that there is a
large difference between the inputs, resulting in slowly increasing
output signals from the Slope Controller. As this input signal for the Trigger unit increases, the output gives firing signals to the thyristors At a firing angle, increasing from 0° towards 180°. The input voltage to the output transformer increases, and so does the current in the
series circuit. Through the feedback current transformers this signal
proceeds to the RMS-unit, where a DC-signal, proportional to the RMS-value of the measured current, is produced on the output terminal.
c.3 Supervision and alarms.
In CCR type 951 all monitoring and alarmfunctions are concentrated around
the Monitoring CPU unit. This unit includes a number of functions as described
in the following.
c.3.1 Current measure, monitoring and display.
In "normal" mode the digitale display of the unit will show selected
runway, light intensity and RMS value of the output current.
The current is continuously supervised to be higher than Imin - limit and less than end Imax - limit. If not, an alarm will be given and the CCR
switched off after an adjustable delay.
Imin and Imax can be adjusted via the CPU unit.
c.3.2 Voltage measure and display.
The display in the unit can be switched to display the mains supply or
the CCR output voltage (RMS value).
c.3.3 Lamp Failure supervision/display of power.
Lamp failure supervision is carried out by measuring the output power from the CCR to the series circuit in each step. Current and voltage are measured in the Lamp Failure Measuring Box and data-processed in
the Analog Supervisor unit and the result displayed in the Monitoring
CPU unit. Here the limits for warning and alarm can be adjusted (app.
5-15%), and the output power can be displayed.
c.3.4 Earth Failure.
Earth Failure is detected by measuring a DC-current to ground in an earth failure measuring box. This is sourced by a separate 500V DC supply. The measuring signal is data-processed in the Analog Supervisor unit, and the result displayed in the Monitoring CPU unit. Values between 0 and app. 1MΩ can be displayed, and levels for warning can be adjusted.
c.3.5 Alarm memory/read-out.
The Monitoring CPU-unit has a built-in watch with calendar and all alarms (and warnings) will be registrated with data and time. Out of each type of alarm, the memory will remember the 10 latest.
The Monitoring CPU unit can from the front side be connected to a PC'er (RS - 232) and the alarms can be transferred. In the same
manner alarmlimits can be displayed, corrected and transferred back to
the Monitoring CPU unit.
c.3.6 Hour counters.
The Monitoring CPU unit has a number of built-in hourcounters. One for
switched-on CCR (evt. for each light direction) and one for CCR on
100% intensity.
c.3.7 Language
The Monitoring CPU unit can be configurated to display almost all languages.
c.4 Taxiway (/Stopbarre) selector (option).
A Taxiway Selector unit can be mounted in the electronic cassette, and
together with a Circuit Selector Board, parts of the series circuit can be
D. SPECIFICATIONS.
- standard input voltage, sinus: 400V
415V +/- 10%
- mains frequency: 50 or 60Hz +/- 2%
- standard 100% - current: 6,6, 10 or 20A
- standard output power ratings: 3-5-7,5-10-12,5-15-
20-25KVA
- cos ϕ, not compensated, see curve on datasheet.
regulation accuracy better than +/- 0,8% at 100%
load (resistive). This accuracy is valid for input
voltage variations +/- 10% or loadvariations -10%.
- regulation speed, small
variations: faster than time
constant of the
lamps.
- regulation speed, large variations: adjustable max.
regulation speed
(0-100%
regulation,
adjustable 0,3 - 3
sec.).
- adjustable Imin (min. current) alarm for app. 5-15% of nominel outputcurrent. - adjustable Imax. (max. current) alarm for app. 0-25% overcurrrent.
- for both Imin and Imax. alarm, demagnetizing within 100 ms,
followed by switch-off.
- ambient temperature: + 5°C to + 45°C
- Relative humidity max. 95%, non-
Condensing
- Cubicle sizes (Modules, see Drawing. 951.020):
- “FAA” (single CCR, in 6modul complete with output Transformer):
- “D1” (max 2 nos. CCR, each max 30 kVA, in 10modul complete with output Transformer)
- “D2” (max 3 nos. CCR, each max 12,5 kVA, in 10modul complete with output Transformer)
- “Z” (max 4 nos. CCR, each max 25 kVA, in 10modul excl. Output transformers)
