OPERATING AND MAINTENANCE MANUAL
Chapter 5 - Installation
iC 215 ÷ iC 780
27
The data in this manual are not binding and they can be modified by the manufacturer without notice.
Reproduction of this manual is strictly prohibited
EN
ENGLISH
Specific densities table P
5 . 6
E l e c t r i c a l c o n n e c t i o n s
The unit’s connection to the power supply must be made in compliance with laws and prescriptions in force in the place of
installation. The voltage, frequency and number of phases must comply with the data on the unit’s nameplate.
The power supply voltage must not be outside the tolerances shown on the electrical schematic, even in terms of transients.
Unless otherwise specified, the frequency tolerance is +/-1% of the nominal value (+/-2% for short periods).
With a three-phase power supply the voltage must be symmetrical (the effective values of phase to phase voltages and
consecutive phase angles must be identical).
In particular, unless otherwise indicated, the maximum permissible phase imbalance is 2%, calculated for each phase
according to the formula:
Vavg
= average phase voltage
ATTENTION
In dual frequency versions the unit is factory supplied for operation with 400V/3Ph/50Hz.
If the unit is to be fed with a 60Hz supply (dual frequency versions only), the control circuit transformer must be fed with
460V. Make sure you disconnect the electrical power supply before making any changes. For further details refer to the
specific electrical schematic. In addition, you will need to adjust parameter CF63 (see “7.22 Parameters description-
settings”).
For the electrical power supply:
1. connect the unit to the building’s protective earth system
2. ensure automatic suspension of the power supply in the event of an insulation fault (protection against indirect
contact in compliance with the prescriptions of IEC 364) by means of a residual current device (the nominal trip
current of which should normally be set to 0.03 A)
3. make sure the level of protection against indirect contact at the source of the power feeding cable is equivalent at
least to IP2X or IPXXB
4. at the start of the power cable install a device that protects it from current surges (short-circuits) (refer to the
indications given in the electrical diagram)
5. use conductors rated to carry the maximum current required at the maximum operating ambient temperature,
according to the chosen installation type (IEC 364-5-523) (see the indications on the electrical diagram)
6. install protection devices that limit the short circuit current to 17 kA peak in correspondence with the rated
breaking capacity if the short-circuit current in the point of installation is greater than an effective value of 10 kA.
Indications on the electrical diagram:
A maximum permissible size of the fuse type gG.
In general, fuses can be replaced by an automatic circuit breaker set in relation to the unit’s maximum current
input (consult the manufacturer if necessary)
B section and type of power cable (if not already supplied):
•
installation: insulated conductors, multicore cable in a cable duct, installed overhead, or fixed to a masonry
structure (type C in compliance with IEC 364-5-523 1983) or without any other cables in contact
•
operating temperature: maximum operating ambient temperature for the unit
•
cable type: copper conductors, 70°C PVC insulation (unless otherwise specified) or EPR 90°C insulation
For further details refer to the attached electrical schematic.
% Glycol
0%
10%
20%
30%
40%
Temperature [°C]
-20
1.0036
1.0195
1.0353
1.0511
1.0669
-10
1.0024
1.0177
1.033
1.0483
1.0635
0
1.0008
1.0155
1.0303
1.045
1.0598
10
0.9988
1.013
1.0272
1.0414
1.0556
20
0.9964
1.0101
1.0237
1.0374
1.051
30
0.9936
1.0067
1.0199
1.033
1.0461
40
0.9905
1.003
1.0156
1.0282
1.0408
MaxPhaseVoltageDifferenceFromVavg
Vavg
---------------------------------------------------------------------------------------------------------- 100
x