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118 HVAC Drive H300
Issue Number: 3
5.10 Displaying parameters with non-
default values only
By selecting 'Show non-default' in Pr mm.000 (Alternatively, enter 12000
in Pr mm.000), the only parameters that will be visible to the user will be
those containing a non-default value. This function does not require a
drive reset to become active. In order to deactivate this function, return
to Pr mm.000 and select 'No action' (alternatively enter a value of 0).
Please note that this function can be affected by the access level
enabled, refer to section 5.9 Parameter access level and security on
page 117 for further information regarding access level.
5.11 Displaying destination parameters only
By selecting 'Destinations' in Pr mm.000 (Alternatively enter 12001 in
Pr mm.000), the only parameters that will be visible to the user will be
destination parameters. This function does not require a drive reset to
become active. In order to deactivate this function, return to Pr mm.000
and select 'No action' (alternatively enter a value of 0).
Please note that this function can be affected by the access level
enabled, refer to section 5.9 Parameter access level and security on
page 117 for further information regarding access level.
5.12 Communications
As standard the H300 drive is provided with a 2 wire EIA-485 interface
located beneath the control terminals, see Figure 4-46 Location of the
comms connector on page 104. It allows communication to other
devices via three building automation network protocols (Modbus RTU,
BACnet MSTP and Metasys N2 Open).
5.12.1 EIA-485 Serial communications
The serial communications port is a 3 way screw type connector, which
is isolated from the power stage and the other control terminals (see
section 4.12 Communications connections on page 104 for connection
and isolation details).The communications port applies a 2 unit load to
the communications network.
USB/EIA-232 to EIA-485 Communications
An external USB/EIA-232 hardware interface such as a PC cannot be
used directly with the 2-wire EIA-485 interface of the drive.
To gain access to the drive parameters (including connection to HVAC
Connect), a KI-485 Adaptor should be installed as shown in Figure 5-8
and used in conjunction with a suitable USB to EIA-485 isolated
converter. A suitable isolated converter is available from Control
Techniques:
• CT USB Comms Cable (CT part number: 4500-0096).
A KI-485 Adaptor is also required for remote LCD keypad operation. The
communications cable between the KI-485 Adaptor and keypad is wired
one to one. The maximum cable length is 100 m when conductors of
0.129 mm
2
(AWG 26) or larger are used and the cable shield should be
connected to the grounded panel / cubicle at the keypad end of the
cable.
Figure 5-8 KI-485 Adaptor Installation
To install, align the KI-485 Adaptor and press gently in the direction
shown until it clicks into position. To remove, reverse the installation
instructions.
The KI-485 Adaptor can be installed / removed while the drive is
powered up and running a motor, providing a remote keypad is not
connected to a port on the KI-485 Adaptor and operating in keypad
mode
When using the Control Techniques converters or any other suitable
converter with the drive, it is recommended that no terminating resistors
be connected on the network. It may be necessary to disconnect the
terminating resistor within the converter depending on which type is
used.
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