NOVUS Controller N2000 User Manual

Page 5

Controller N2000

NOVUS AUTOMATION

5/9

KEY

The

key in front panel executes function 6 of Table 2:

Auto/Manual mode change. Operation of this key is enabled in
parameter

aven

. The MAN indicator lights when the manual control

mode is selected.

EXTRA 24 VDC POWER SUPPLY – AUXILIAR P.S.

The controller provides a voltage power supply of 24 Vdc to excite
field transmitters with 25 mA current capacity. Available at the back
panel terminals 17 and 18.

CONFIGURATION PARAMETERS

OPERATION CYCLE

PV Indication

(Red)

SV Indication

(Green)

PV AND SV INDICATION: The status display shows the
present value of PV (Process Variable). The parameter
display shows SV (Set Variable).

The status display shows “- - - -“ whenever PV exceeds the
maximum range or there is no signal at the input. In case of
hardware error the status display will show Ern

Ern

Ern, where n is the

error code.

avto

CONTROL MODE: YES indicates automatic control mode
(closed loop, PID or ON/OFF). NO indicates manual control
mode (open loop). Bumpless transfer from auto

↔

to manual

mode is available. If in doubt program YES.

PV Indication

(Red)

MV Indication

(Green)

MANIPULATED VARIABLE VALUE (MV): The upper display
shows PV value and the lower display shows the percentage
of MV applied to the control output. When in manual control
the MV value can be manually changed. When in auto mode
the MV value can only be viewed.

To distinguish the MV display from the SV display, the MV is
shown flashing intermittently.

Pr n

RAMP AND SOAK PROGRAM SELECTION: Selects the
ramp and soak program to be executed (7 programs
possible). Refer to chapter 7 for R&S description.

rvn

CONTROL ENABLE: YES means that the control output and
alarms are enabled and NO means they are disabled.

AUTO TUNING CYCLE

atvn

AUTO-TUNE: YES enables the auto tuning of the PID
parameters and NO disables it.

PROPORTIONAL BAND: Percentage of maximum input span.
0 to 500 %. Select zero for ON / OFF control.

xyst

CONTROL HYSTERESIS (in engIneering. units): This
parameter is only shown for ON / OFF control (Pb=0).

‘ ir‘

INTEGRAL RATE: Integral time constant in repetitions per
minute (Reset).

DERIVATIVE TIME: Derivative time constant, in seconds.

CYCLE TIME: PWM period in seconds. Can only be viewed if
proportional band is other than zero.

act

CONTROL ACTION: For Auto Mode only.

•

Reverse Action usually used for heating.

•

dir

dir Direct Action usually used for cooling.

bias

Offset for MV (manual reset). Range: -100 % to +100 %.
Default value: 0.

ovll

OUTPUT LOW LIMIT: minimum percentage value for MV
(Manipulated Variable) when in automatic control and PID.
Default value: 0.0 %

ovxl

OUTPUT HIGH LIMIT: Maximum percentage value for MV
when in automatic control and PID. Default value: 100.0%

sfst

SOFT START: Time in seconds during which the controller
limits the MV value progressively from 0 to 100 %. It is
enabled at power up or when the control output is activated.
If in doubt set zero.

Sp.a1

Sp.a1
Sp.a2

Sp.a2

Sp.a2
Sp.a3

Sp.a3

Sp.a3
Sp.a4

Sp.a4

ALARM PRESET: Tripping point for alarm 1, 2, 3 and 4.

RAMP AND SOAK PROFILE PROGRAMMING CYCLE

tbas

TIME BASE: Selects the time base for the ramp and soak.
Valid for all profile programs.
0

0 - PT1 to PT7 values are in seconds;
1

1 - PT1 to PT7 values are in minutes;

Pr n

PROGRAM TO BE VIEWED: Selects the ramp and soak
profile program to be edited/viewed in the following cycle
prompts (7 programs available).

ptol

RAMP AND SOAK TOLERANCE: maximum deviation
between PV and SV. Whenever this deviation is exceeded
the time counter is halted until deviation lowers to within the
tolerance. Set zero to disable this function.

Psp0

Psp7

RAMP AND SOAK SET POINTS (0 to 7): Set of 8 SV values
which define the ramp and soak profile segments. See also
PT1 to 7 and PE1 to 7 below.

Pt1

Pt7

RAMP AND SOAK SEGMENTS TIME (1 to 7): Set of 7 time
intervals in minutes or seconds (9999 max.) for the 7
segments of the ramp and soak program.

Pe1

Pe7

RAMP AND SOAK EVENT (1 to 7): Set of 7 values that
define which alarms must be activated during a ramp and
soak program segment. Alarm function depends on “rS

rS”

setting (Table 3).

LINK TO PROGRAM: Number of the next profile program to
be linked to follow the current profile. Profiles can be linked to
make larger programs of up to 49 segments.

ALARM CYCLE

Fva1

ALARM 1 FUNCTION: Select options from Table 3.

Fva2

ALARM 2 FUNCTION: Select options from Table 3.

Fva3

ALARM 3 FUNCTION: Select options from Table 3.

Fva4

ALARM 4 FUNCTION: Select options from Table 3.

bla1

bla1
bla2

bla2

bla2
bla3

bla3

bla3
bla4

bla4

ALARM BLOCK 1 TO 4: This function blocks the alarm at
power-up when the units is first energized.

YES enables and NO inhibits this blocking function. When
enabled the alarm will not be active at power-up waiting for
PV (Process Variable) to reach a non-alarm situation. From
this point on the alarm will be free to actuate should a new
alarm situation occur.

xya1

ALARM 1 HYSTERESIS: Defines the differential range
between the PV value at which the alarm is turned on and
the value at which it is turned off (in engineering units).

xya2

ALARM 2 HYSTERESIS: Same as above.

xya3

ALARM 3 HYSTERESIS: Same as above.

xya4

ALARM 4 HYSTERESIS: Same as above.

A1t1

ALARM 1 TIME 1: Defines the time (6500 sec. max.) during
which the alarm 1 output will be ON when alarm 1 is active.
Program zero to disable this function.

A1t2

ALARM 1 TIME 2: Defines the OFF state time for the alarm
1 output, after being ON during the time selected on ALARM
1 TIME 1. Program zero to disable this function.

A2t1

ALARM 2 TIME 1: Defines the time (6500 sec. max.) during
which the alarm 1 output will be ON when alarm 1 is active.
Program zero to disable this function

A2t2

ALARM 2 TIME 2: Defines the time during which the alarm 2
output will be, after being ON during the time selected on
ALARM 2 TIME 1. Program zero to disable this function.
Table 4 shows the advanced features that can be achieved
with these time functions.