Technical data

4.20.8 Remote Current Limit Setpoint - PWM
(TB4 terminals 1 & 20)
The motor current limit setpoint can be adjusted
remotely bya1to11second timed closure of remote
contacts connected to these terminals. The input signal
will only be accepted when the control panel is in the
digital 'REMOTE' operating mode.
An accepted signal will set the motor current between
100% and 30% of full load amps. Unit capacity control
will remain from the leaving chilled water temperature,
providing the current limit setpoint is satisfied. If the
compressor motor current exceeds the current limit
setpoint, it will override the temperature control system
to reduce unit capacity.
A one-second pulse corresponds to 100% full load
amperes and an eleven-second pulse corresponds to
30% of full load amperes. The current limit setpoint
varies linearly from 100% to 30% as the pulse-width
changes from 1 to 11 seconds.
4.20.9 Remote Leaving Chilled Water Temperature
Setpoint Reset - Analogue
(0-10 Vdc / 2-10 Vdc - J22 pins 3 & 5)
(0-20 mA / 4-20 mA - J22 pins 4 & 5)
This jumper (JP24) configureable input will adjust the
leaving chilled water temperature up to 22.2°C upwards
from the locally programmed value when the control
panel is in the analogue 'REMOTE' operating mode.
Refer to Field Control Modifications for details.
4.20.10 Remote Current Limit Setpoint - Analogue
(0-10 Vdc / 2-10 Vdc - J22 pins 1 & 5)
(0-20 mA / 4-20 mA - J22 pins 2 & 5)
This jumper (JP23) configureable input will set the motor
current between 100% and 30% of full load amps when
the control panel is in the analogue 'REMOTE' operating
mode. Refer to Field Control Modifications for details.
4.21 Status Connections
Wiring to the status volt free contacts requires a supply
provided by the customer. Particular care must be taken
deriving the supplies for the volt free terminals with
regard to a common point of isolation. These circuits
when used must be fed via the common point of isolation
so that the voltage is removed when the common point
of isolation to the unit is opened.
In accordance with EN 60204 it is
recommended that the customer wiring to
these terminals uses orange wires. This
will ensure that circuits not switched off by
the unit supply disconnecting device are
distinguished by colour so that they can
easily be identified as live even when the
unit disconnecting device is off.
Unless otherwise stated the volt-free contacts
are rated at 5 amps resistive at 250 Vac and
30 Vdc, 2 amp inductive (0.4 pf) at 250 Vac
and 30 Vdc. All inductive devices (relays)
switched by the volt-free contacts must have
their coil suppressed using standard R/C
suppressors.
4.21.1 Remote Mode - Ready to Start
(TB2 terminals 26 & 27)
When closed, these contacts signify the control panel is
in the 'REMOTE' operating mode, allowing the energy
management system or the 'REMOTE START/STOP'
contacts to control the unit.
4.21.2 Run Contacts
(TB2 terminals 35 & 36)
When closed these contacts signify that the unit is
operating.
4.21.3 Anticipatory Alarm
(TB2 terminals 55 & 56)
When closed, these contacts signify that a 'WARNING'
condition has occurred.
4.21.4 Cycling Shutdown
(TB2 terminals 40 & 41)
When closed, these contacts signify the unit is not
permitted to start due to one or more cycling conditions.
The cycling shutdown contacts function in all operating
modes.
4-8 160.81-ICOM-GB0 (01/02)