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SVC
Connection examples
1) Single-circuit condenser e.g. SCA-6-4-914-950-3/400/50-H is equipped with SVC-I-P1-BPA for fan speed control. The condensing pressure is kept constant with PI-control.
SUPPLY 3/400 V/50 Hz
1
CONNECTIONS ON THE FREQUENCY CONVERTER c. , hl w w |—^
- Signal cable shield 1 cr^D
External reference 1: 0...10 V or 0(4)...20 mA Analog input circuit common Reference voltage 10 VDC Actual signal 1: 0...10 V or 0(4)...20 mA Analog input circuit common
|j1-dip|
.------
0-10 V or
4-20 mA
ECU ECI
2
3
i______\/ I_
4
4-20 mA
5
6
SVC-I-P1-BPA SVC-I-T-BPA SVC-I-ECU/I-BPA
A01
7
A02
8
agnd
9
Auxiliary voltage output +24 VDC Common for DI return signals Digital input common for all Start / stop
+24 V
10
gnd
11
dcom
12
1) START / STOP
- running permit
- service rolling
1) Without the control motors shall rotate continuosly at least min. speed
D11
13
D12
14
NOTE! IF BPA-OPTION IS SELECTED THEN RELAY 01
IS RESERVES TO
BPA-FUNCTION
D13
15
D14
16
D15
17
D16
18
R01C
19
Ready = > 19 connected to 21
R01A
20
R01B
21
The desired value of the condensing pressure is set via panel. The operating range of the pressure transmitter is -1...+34 bar (gauge), 4...20 mA. The pressure trans-mitter with default settings is ready-fitted at the factory. The converter supplies electricity to the fan motors only if the 'Start' signal is active. The alarm, by-pass and operational status of the unit can be determined volt-free contacts. The unit maintains the set condensing pressure value by controlling the fan speed accord-ing to operational conditions.
P1 = pressure transmitter Start/Stop = unit activation
The external signal connection (ECU, ECI on the diagram) is not needed on this example.
Running = > 22 connected to 24
R02C
22
R02A
23
R02B
24
Fault = > 25 connected to 27
R03C
25
R03A
26
CONNECTIONS ON TERMINAL BLOCKS Alarm, circuit breakers
Alarm, frequency converter
by-passed, only when BPA-option
R03B
27
The wiring between the unit and the fan motors is ready fitted at the factory
*) Link between 6 and 11 not needed with ECU and ECI.
2) The dry cooler, e.g. SCAG-14-10-950-3/400/50-H, is provided with a temperature transmitter (T) instead of pressure transmitter (P1). The sensing element of this transmitter measures the outlet temperature of the liquid. The control parameters are set according to the required project conditions and specified
dry cooler settings. The external signal connection (ECU, ECI on the diagram) is not needed in this example. Type designation is SVC-I-T-BPA.
3) In remote control the frequency converter receives the direct fan frequency value as a voltage (ECU) or current signal (ECI). In this case pressure (P1) or temperature transmitters (T) are not fitted
to the
dry cooler. If the control is from voltage signal 0...10 V, the type designation is SVC-I-ECU-BPA.
firLCoil
Fincoil-teollisuus Oy
Ansatie 3
FI-01740 Vantaa, Finland Tel. +358-9-894 41 Fax +358-9-8944 318
www.fincoil.fi Subject to changes without prior notice.
4
12/2006
