NOVUS Controller N2000 User Manual

Page 8

Controller N2000

NOVUS AUTOMATION

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CALIBRATION

INPUT CALIBRATION

All inputs are factory calibrated and recalibration should only be done
by qualified personnel. If you are not familiar with these procedures
do not attempt to calibrate this instrument. The calibration steps are:

a) Select the input type to be calibrated.

b) Set the desired upper and lower display limits.

c) At the input terminals inject an electrical signal corresponding to

a known indication value a little higher than the lower display
limit.

d) Select the inL(

inL(

inL( prompt. Through the

and

keys adjust

PV so that it matches the injected signal.

e) Inject a signal that corresponds to a value a little lower than the

upper limit of the display.

f) Select the ink(

ink(

ink( prompt. Through the

and

keys adjust

PV so that it matches the injected signal.

g) Repeat steps c) to f) to improve calibration.

ANALOG OUTPUT CALIBRATION

1) Select type 11 or 12 at the I/O5 prompt.

2) Connect a current meter at the analog output.

3) Disable the auto-tune and soft-start functions.

4) Set the output low limit ovLL

ovLL

ovLL to 0.0 % and the output high limit

ovkL

ovkL to 100.0 %.

5) Select the manual mode at the avto

avto

avto prompt.

6) Enable the output at the rvn

rvn

rvn prompt.

7) At the operation cycle, set the MV to 0.0 %.

8) At the output low calibration ovLC

ovLC

ovLC prompt, press the

and

key until the mA meter reads zero mA. Approach this value from
above.

9) Set 100.0 % for the manipulated variable (MV).

10) At the output high calibration ovkC

ovkC

ovkC prompt, press the

and

key until the mA meter reads 20 mA. Approach this value

from below.

11) Repeat steps 7) to 10) as necessary.

PROBLEMS WITH THE CONTROLLER

Connection errors and inadequate programming are the most
common errors found during the controller operation. A final review
may avoid loss of time and damages.

The controller displays some messages to help the user identify
problems.

MESSAGE

PROBLEM

----

Open input. Without sensor or signal.

Err1

Err6

Configuration or connection problem in the Pt100
cable

Other error messages displayed by the controller can account for errors
in the input connections or type of selected input non compliant with the
sensor or signal applied to the input. If errors persist, even after a
review, contact the manufacturer. Inform also the device serial number.
To find out the serial number, press

for more than 3 seconds.

The controller also has a visual alarm (the display flashes) when the
PV value is out of the range set by spxl

spxl

spxl and spll

spll

spll.

SERIAL COMMUNICATION

The indicator can be supplied with an asynchronous RS-485 digital
communication interface for master-slave connection to a host
computer (master).

The indicator works as a slave only and all commands are started by
the computer which sends a request to the slave address. The
addressed unit sends back the requested reply.

Broadcast commands (addressed to all indicator units in a multidrop
network) are accepted but no reply is sent back in this case.

CHARACTERISTICS

RS-485 compatibility with two-wire connection from the host to up to
31 slaves in a multidrop network topology. Up to 247 units can be
addressed by the MODBUS RTU protocol. Maximum network
distance: 4,000 feet. Time of indicator disconnection: Maximum of 2
ms after the last byte.

Te communication signals are electrically isolated from the rest of the
instrument, and can be 1200, 2400, 4800, 9600, 19200, 38400, and
57600 bps.

•

Number of data bits: 8, without parity or pair parity

•

Number of stop bits: 1

•

Time to start response transmission: up to 100 ms after
acknowledging the command.

•

Protocol: MODBUS (RTU)

RS485 INTERFACE: ELECTRICAL CONNECTION

The RS-485 signals are:

D1 = D: Bidirectional data line

D0 =

Inverted bidirectional data line

C = GND: Ground. Optional connection to improve communication

performance

COMMUNICATION PARAMETERS CONFIGURATION

Two parameters must be configured for serial use:

bavd

: Communication speed. All equipments with the same speed.

Addr

: Controller communication address. Each controller must

have an exclusive address.