2 Instructions
2.1.1 Abbreviations and Definitions
ACK Acknowledge
ADF Internal Floating Points
ADI
Internal Integers
AI
Analog Inputs
AO
Analog Outputs
BI
Binary Inputs
BO
Binary Outputs
COS Change Of State
FC
Frequency Converter
HPFB High Performance Field Bus
JCI
Johnson Controls Inc. developers of the METASYS N2 protocol
N2
METASYS N2
N2
mast
er
A N2 master is either a PC with JCI software or a dedicated JCI
controller
NAK Not acknowledged
NPA N2 Point Address (Each N2 Point Type has a address range
from 0 to 255)
NPT N2 Point Type
PAR Parameter Number
2.1.2 Network Connection
Connect signal wires to terminal 68 (N+) and terminal 69 (N-)
on main control board of the drive. If shielded cabling is used,
connect one end of the shield to terminal 61. This terminal is
connected to ground via an internal RC link. It is highly
recommended to use shielded twisted-pair cables to reduce
the differential mode interference between the conductors.
Danfoss do not take any responsibility for consequences, if
unshielded or untwisted cables are used.
Torque Specifications:
4.5 in.lb. (0.5 Nm) if screw terminal is used
Control wire:
18 - 24 AWG, shielded, twisted pair
2.1.3 Hardware Set-up
RS-485 Bus Connection:
One or more frequency converters can be connected to a
control (or master) using the RS-485 standardized interface.
Terminal 68 is connected to the P signal (TX+, RX+), while
terminal 69 is connected to the N signal (TX-,RX-). If more than
one frequency converter is connected to a master, use parallel
connections.
130BA060.11
68 69
68 69
68 69
RS 485
RS 232
USB
+
-
1
2
S801
ON
130BA272.11
Illustration 2.1: Bus termination switch
NOTE
The factory setting for the dip switch is OFF.
In order to avoid potential equalizing currents in the screen,
earth the cable screen via terminal 61, which is connected to
the frame via an RC-link.
Bus termination: The RS-485 bus must be terminated by a
resistor network at both ends. For this purpose, set switch
S801 on the control card to "ON". For more information, see
the paragraph: Switches S201, S202 and S801.
Instructions
VLT
®
Metasys
MG.11.G2.02 - VLT
®
is a registered Danfoss trademark
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2
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