Operating instructions
68
Compressor start and stop are controlled by the ISM (1CR
output).
When the start-up command is received, the starter controls
the power thyristors to initiate the power supply to the motor.
The voltage reduction obtained by chopping is controlled by
the starter to maintain the current at the value configured
in the starter.
ATTENTION: If the limited current is configured at a
value that is too low, the mechanical torque supplied by
the motor does not allow it to start. It remains in the locked
rotor condition: the compressor does not start and the PIC
control generates an alarm.
At the end of the start-up process, an internal bypass
contactor at the starter is closed: the thyristors no longer
have power supply; the power supply to the motor is at full
voltage.
When shutting down, thyristors are again used to reduce
the motor voltage, until the motor is stopped.
The control box includes fans to keep the temperature
inside below a value of 50°C, that is used for the selection
of the electrical components. The fans are controlled by an
internal thermostat.
Max. machine RLA*
330% of max. motor
RLA by default**
50 Hz (± 2 Hz)
-10% to +10%
15% over 2 seconds
61000-6-4
61000-6-2
* RLA value set at the machine PIC control and corresponding to the RLA of the
unit selection che.
** or taken from the operating current values “Ie” and the current limitation “xIe”
set in the starter. See chapter 15.4.2.2.
The electrical equipment is integrated, wired, pre-configured
and tested at the factory. On-site installation includes the
connection of customer auxiliary and communication power
supply cables, as well as configuration parameter adjust-
ment specific to the installation site.
During storage the machine must be protected against
humidity and dust. Specifically, the machine must not be
placed outside, exposed to the weather.
17.3.1 - Unit rigging
ATTENTION: The control box must not be used as a
machine rigging point.
The 19XR/19XRV machine rigging points on units with a
starter are the same as those for the standard machine.
17.3.2 - Weight and dimensions
The weight of 19XR/19XRV machines with a starter is the
same as that of standard machines plus the weight of the
additional material to ensure the progressive start-up
function:
Max motor RLA range, A < 440 440 < < 630 630 < < 1350 1350 <
Compressor sizes 2 and 3 3 and 4 4 and 5 5
Control box weight, kg 200 220 290 330
The height of 19XR/19XRV machines with a starter is
increased compared to the standard machine without a
starter:
2130
2300
2480
2580
2980
3020
Refer to the dimensional drawings supplied with the
machine.
17.5.1 - Power wiring connections
The units have only one power connection point.
Cable sizing is the responsibility of the installer and must
comply with the characteristics and regulations specific to
each installation site. The connections supplied as standard
for the incoming customer power cables on the circuit
breaker/main disconnect switch are designed to receive
the number of conductors defined in the table below.
< 250 x 1
250 < < 450 x 2
450 < < 800 x 3
1350< x 4
The connections are made on power rails drilled with
holes to take connectors with diameters M8, M10 or M12,
depending on the machine capacity.
Before connecting the power cables (L1 - L2 - L3), ensure
that the sequence is correct.
17.5.2 - Control wiring connections on site
For the site control wiring of the following elements refer
to the 19XR PIC controls manual and the certified wiring
diagram supplied with the unit: