NOVUS NT240 User Manual

NT240 TIMER

PROGRAMMABLE TIMER – INSTRUCTIONS MANUAL V20x A

INTRODUCTION

The NT240 is a programmable timer designed to monitor time intervals, activating its outputs according to some predefined mode of operation and time intervals chosen by the user. The user can also create its own mode of operation to best fit his application.

The timer shows the elapsed time in an increasing or decreasing mode, with resolutions from 0.01 s to 1 hour.

Digital inputs are available to perform specific functions. Standard outputs are relay and logic pulse (5 V) types.

SPECIFICATIONS

Input types: - NPN/PNP sensors

-NO/NC dry contact

-Voltage: Logic level 1: 5 to 30 Vdc

Logic level 0: -0.5 to 0.5 Vdc

Output: - 1 SPST Relay 3 A / 250 Vac (3 A / 30 Vdc)

- 1 voltage pulse 5 V / 25 mA

Time delay after turning on the timer: 200 ms

Accuracy: 0,1 % of displayed time

Response time: 10 ms for the relay output and 0.3ms for the pulse output

Auxiliary voltage source: 12 Vdc ±10 % / 50 mA

Power: 100 to 240 Vdc/ca, 50/60 Hz or 24 Vdc/Vac, 50/60 Hz

Maximum consumption: 3 VA

Operating environment: 0 to 55 ºC, Relative humidity (maximum): 80 % up to 30 ºC. For temperatures above 30 ºC, decrease 3 % per ºC.

Dimensions: 48 x 48 x 106 mm

Cut for panel fixation: 45.5 to 45.5 mm

Approximate weight: 150 g

TIMER INPUTS

The timer has three control inputs: START, HOLD and RESET.

These inputs can be configured to accept four different electrical (logical) signals (see parameter PnP in the configuration). The signal type there defined becomes the same for all three inputs.

START: Starts time counting

The start input, when activated, starts the temporization cycle, using the operating mode selected in the configuration. The START input is available on terminals 9 and 12.

HOLD: Interrupts time counting

The HOLD input, while active, interrupts time counting. When the HOLD input is released, the time counting resumes from the point it was interrupted.

NOTE: The HOLD function can activated by the F key, when programmed to perform as such on the F Fv parameter of the timer. Using the F key as the input to HOLD function, pressing once stops the timer and pressing again resumes the counting of time.

RESET: Timer Input Reset

The Reset input, when activated, cancels the current temporization and returns the timer display to the initial value. While Reset is active, the temporization can not be started. When Reset is released, the timer becomes available for new temporization.

TIMER OUTPUTS

The timer provides an output, called TIMER OUTPUT, which can be activated in various ways according to the selected temporization mode. This output is available as a relay contact and as a voltage pulse (both operate simultaneously).

Output types: 1 SPST – 3 A / 250 Vac relay, terminal 3 and 4;

1 voltage pulse of 5 V / 25 mA, terminals 5 and 6

Output delay time: 10 ms for relay output;

0.3 ms for pulse output.

The 0Per parameter defines the way the output will operate.

AUXILARY SUPPLY OUTPUT

A 12 Vdc ±10 % (50 mA max) auxiliary power supply is provided on terminals 7 and 8 to power electronic sensors used as inputs to the timer. The (-) supply terminal is wired internally to the GND terminal of the inputs (the supply is not electrically isolated from the inputs).

INSTALLATION

Panel Mounting

Insert the unit into the panel cut-out (use the dimensions specified in the "Technical Specifications" section) and slide the mounting clamp from the rear to a firm grip at the panel.

The timer circuitry can removed from its case from the front, without the need of disassembling the instrument from the panel, leaving the wire connections intact.

Electric connections

Figure 01 shows the timer terminals along with theirs functions.

Figure 01 – Timer connections panel

Recommendations for Installation

∙Input signal wires should be laid out away from power lines and preferably inside grounded conduits.

∙Instrument mains should be suitable for this purpose and wires should not be shared with high consumption motors and inductors.

∙Use of RC filters (47 Ω and 100 nF) in parallel with solenoids and contactor coils are highly recommended.

∙In monitoring and control applications it is essential to consider what can happen when any part of the system is subject to failure.

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Connections of the input signals

The type of signal to be applied to the inputs is determined by the user in the PnP parameter of the timer. The signal type must be the same for the three inputs (Start, Hold and Reset).

Sensors with NPN/PNP open collector output:

Common to most proximity sensors, must be connected as indicated in Figure 02. The PnP parameter must be set to 0 for NPN sensor output and to 1 for PNP.

Figure 02 – Connecting PNP/NPN type sensor

- Signal from relay or switch (dry contact):

Wire dry contacts as shown on Figure 03. For this type of input, configure PNP = 0.

Timer NT240

Levels structure:

1 Indication of elapsed time Shown on power-up;

2 Setpoint level (temporization setpoints) To enter, press P for 4 seconds;

3 Configuration level.

Press	P		for 8 seconds;
4 Custom Operating mode level.
Press			P	for 12 seconds;

To enter into deeper levels, press the P for the time required by

the level and when the timer shows the first parameter of that level, simply release the P key to stay in that level. Other parameters in that level are accessed by pressing the P key.

To modify the value of a parameter use the and keys for incrementing or decrementing the value, respectively. After the last parameter of the cycle is reached, the timer returns the main screen (Indication of Elapsed time).

The modified values are stored in a non-volatile memory when the P key is pressed to move to the next parameter.

Figura 03 - Conectando contato seco (relé, interruptor)

- Voltage input signal

Refer to the “Specifications” section for the input voltage levels compatible with the timer. Figure 04 shows the wiring scheme.

When PNP = 1, the timer recognizes the rising edge of the pulse For the recognition of the falling edge, set PnP = 0.

Figure 04 - Connection for pulse input.

OPERATION

Following power-on, the timer shows the main screen (Time) and will remain in this screen in normal operation.

For configuring the timer, it is necessary to set proper values to the various internal parameters.

The parameters are organized in three levels. To enter these levels, one must press the P key for defined intervals of time, as shown below.

PROGRAM SECURITY

To avoid tampering, parameter “Prot” and a hardware jumper can be used to disable access to programming parameters.

With the jumper in the OFF position, all program levels are unprotected. The “Prot” parameter can only be changed with the jumper in the OFF position.

With the jumper in the ON position or removed, the protection level is defined by the current value of the “Prot” parameter:

0 No protection. All parameters can be accessed;

1No access to Operating mode level.

2 No access to Operating mode level and Configuration level. 3 Full protection.

OFF									ON
Figure 2 – Protection Disabled					Figure 3 – Protection Enabled

Temporization Setpoints Level

	T1.sp	Timer Setpoint:	It defines the total time	to be
	Timer 1 SetPoint	counted by the	timer. In up counting, the	timer
		counts from zero to the value programmed in
		t1..SP. In countdown, the timer counts from the
		value programmed in t1..SP to zero.
	0v1.t	Output temporization: Defines the interval of time
	Output 1 Time	the output is to remain active after the		time
		programmed in	t1..SP has elapsed (parameter
		T1..S4 shall be set to 1 output turns off after
		output temporization).
		During the output temporization the relays are
		maintained active while the corresponding LEDs
		blink to indicate the output temporization is taking
		place.

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