7
ENG
“FCR3 three-phase controller” +030222150 - rel. 1.3 - 12.01.2021
1. INTRODUCTION
The FCR device is a three-phase voltage regulator with microprocessor
control that uses the phase control principle to manage condensing fan
speed based on the applied control signal. The voltage supplied at the
output is expressed as a percentage of the input voltage.
Several devices can be controlled together across a Modbus RS485 serial
network, by connecting them together and then setting the address.
ATTENZIONE!
TOGLIERE TENSIONE PRIMA DI APRIRE IL COPERCHIO
ATTENTION!
DISCONNECT POWER BEFORE OPENING THE COVER
Fig. 1.a
The following models are available, which diff er in terms of rated load.
FCR3064020
6 A controller – 400 V 50/60 HZ – IP55
FCR3094040
9 A controller – 400 V 50/60 HZ – IP55
version with terminal to connect two electrical loads.
FCR3124020
12 A controller – 400 V 50/60 HZ – IP55
FCR3204020
20 A controller – 400 V 50/60 HZ – IP55
FCR3404020
40 A controller – 400 V 50/60 HZ – IP55
Tab. 1.a
1.1 Main
features
Power supply
The power supply is 400Vac 50/60 Hz. Mains frequency needs to be
selected on the dipswitch during installation.
Analogue input
The controller input can accept a 0/10V (a potentiometer can also be
used), 0/5 V PWM or 0-20 mA current signal.
Manual setting or confi guration by internal parameters
The FCR controller can be set in the following ways:
•
manually using the trimmers and dipswitches (limited to the main
functions);
•
using the internal parameters (memory) as set previously (via
programming key or serial line).
In the fi rst case, the main functions are available for the simple use of the
controller and setting. In the second case, other functions are included.
In particular, alarm management and temperature settings, as well as
the possibility to override the input signal and output voltage. The latter
override operations are only available to expert personnel.
Minimum and maximum output setting
The range of variation of the output - and consequently the fan speed
- can be set, so as to satisfy minimum allowable speed and maximum
acceptable noise requirements, based on the fans used and the specifi c
application.
Delay setting
The response time to an input step (0-10 sec) can be set, so as reduce
peak current on the loads.
Min/Cut-off setting
This function is used to establish the behaviour when there is no control
signal.
In Min mode, the controller keeps operating at the minimum voltage set.
In Cut-off mode, the fans are stopped and the output is reset when the
control signal is 10% of end scale.
Linear-Quadratic setting
This function is used to manage the relationship between control signal
and output voltage.
•
Linear: the relationship is linear.
This means that the voltage supplied
to the load is directly proportional to the control signal, with slight
variations in speed relating to large deviations in the control signal
near end scale.
•
Quadratic: the relationship between the variation in the control
signal and the voltage delivered to the load is quadratic.
In practice,
this gives a “softer” start to the load and more signifi cant changes in
speed at higher input signal values, providing an increasingly fast
response when approaching the upper limit of the control band.
Internal sensor temperature management
An internal temperature sensor is fi tted that reads the temperature inside
the controller. Limits (minimum and maximum) can be set for activating
an alarm (alarm LED fl ashing). These limits have no eff ect on control and
the output voltage.
Digital input management
Two digital inputs are provided - SW1 and SW2 - connected in series
on the same microprocessor line. The board is fi tted with a jumper. The
inputs must be an insulated, voltage-free contact to avoid damaging the
control board. The inputs are used to read the motor thermal overload
device. They can be programmed with direct or reverse logic (normally
closed or normally open), with an alarm activated when the opposite
condition is true