NuWave NWVS-4 User manual

Rev.7.406/22
Rev7.4 NUWAVE TECHNOLOGIES,INC.
NWVS-4 &NWVS-8 INSTALLATION AND USER MANUAL
LOW VOLTAGE STEP CONTROL WITH VERNIER STAGE

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Rev7.4 NUWAVE TECHNOLOGIES,INC.
Table Of Contents
1. Ordering Code.....................................................................................................................3
2. Description..........................................................................................................................3
3. Key Features.......................................................................................................................3
4. Installation / Safety Information...........................................................................................3
4.1 Limited Warranty..........................................................................................................4
4.2 Mounting Instructions/Dimensions...............................................................................4
4.3 24VAC Power Input and Internal Wiring ......................................................................5
5. Dipswitch Settings...............................................................................................................6
5.1 Input Selection.............................................................................................................6
5.2 Stage Selection............................................................................................................7
5.3 Output Mode Selection ................................................................................................7
5.4 Master/Slave Selection ................................................................................................8
5.5 Vernier Output Type Selection.....................................................................................8
6. Adjustment Potentiometers.................................................................................................8
6.1 Stage Delay Adjustment...............................................................................................8
6.2 Vernier Ratio................................................................................................................9
7. Test Button..........................................................................................................................9
8. Indicator LEDs.....................................................................................................................9
9. Outputs ...............................................................................................................................9
9.1 Relay Outputs..............................................................................................................9
9.2 Vernier Output –Time Proportioned Drive Specifications............................................9
9.3 Vernier Output - Master/Slave Configuration .............................................................10
10. Electrical Specifications.................................................................................................10
11. Wiring Diagrams............................................................................................................12
11.1 Command Input Wiring ..............................................................................................12
11.2 8 Stage Wiring - Time Proportioned Vernier for SSR Drive........................................13
11.3 8 Stage Wiring –SCR Power Control on Vernier.......................................................14
11.4 16 Stage Wiring Using Slave Board...........................................................................15

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Rev7.4 NUWAVE TECHNOLOGIES,INC.
1. Ordering Code
NWVS-8 –Eight Position Step Control with Vernier Output
NWVS-4 –Four Position Step Control with Vernier Output
2. Description
The NWVS is a microcontroller-based step controller that provides precise
modulation in multi-stage heater applications such as duct heaters. The built-
in Vernier stage allows for smooth, precision control of the load without
increasing switching wear in the system contactors.
3. Key Features
•Adjustable Stage Delay
•Pulsed or Analog Vernier output
•Adjustable Vernier ratio
•Expandable to 16 stages
•LIFO/FIFO selection
•Test button
•Brown out protection
4. Installation / Safety Information
Responsibility for determining suitability for use in any application / equipment lies solely on
the purchaser, OEM and end user. Suitability for use in your application is determined by
applicable standards such as UL, cUL and CE and the completed system involving this
component should be tested to those standards.
WARNING: FIRE HAZARD!! Even quality electronic
components CAN FAIL KEEPING FULL POWER ON! Provide a SEPARATE
(redundant) OVER TEMPERATURE SHUTDOWN DEVICE to switch the
power off if safe temperatures are exceeded.
WARNING: HIGH VOLTAGE!! This control is wired to a
transformer, Solid State Relay, and contactors with high voltage on them.
This control must be installed in a GROUNDED enclosure by a qualified
electrician in accordance with applicable local and national codes including
NEC and other applicable codes. Provide a safety interlock on the door to
remove power before gaining access to the device.

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Rev7.4 NUWAVE TECHNOLOGIES,INC.
4.1 Limited Warranty
NuWave Technologies, Inc. warrants this product to be free from defect in
workmanship and materials for a period of one (1) year from the date of
purchase.
1. Should unit malfunction, return it to the factory. If defective it will be
repaired or replaced at no charge.
2. There are no user serviceable parts on this unit. This warranty is void if the
unit shows evidence of being tampered with or subjected to excessive heat,
moisture, corrosion or other misuse / misapplication.
3. Components which wear or damage with misuse are excluded, e.g. relays.
4. NuWave Technologies, Inc. shall not be responsible for any damage or
losses however caused, which may be experienced as a result of the
installation or use of this product. NuWave Technologies, Inc. liability for
any breach of this agreement shall not exceed the purchase price paid E. &
O.E.
4.2 Mounting Instructions/Dimensions
The NWVS should be mounted using #6 screws at the five locations shown
below. The board is supported by five, 0.300”or 0.375”high spacers
(supplied attached to the board). For proper thermal management, avoid
mounting the board with the output relays underneath the other board
components.

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Rev7.4 NUWAVE TECHNOLOGIES,INC.
4.3 24VAC Power Input and Internal Wiring
The NWVS internal power supply is half wave rectified. The command input
and analog outputs share a common ground with the 24VAC power input
ground. The diagram below details the internal wiring of the NWVS.
WARNING: EXCEEDING 30MA OR 15V ON THE COMMAND INPUT
CAN PERMANENTLY DAMAGE THE NWVS CAUSING THE OUTPUTS TO STAY ON
100%. USE CARE WHEN WIRING THE COMMAND INPUT AND USE A SEPARATE
(REDUNDANT) OVER TEMPERATURE SHUTDOWN DEVICE TO SWITCH POWER OFF
IF SAFE TEMPERATURES ARE EXCEEDED.

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Rev7.4 NUWAVE TECHNOLOGIES,INC.
5. Dipswitch Settings
5.1 Input Selection
S1 positions 1-5 select which command input the NWVS will accept.
Switch
S1
Position→
1
2
3
4
5
Label→
mA
mA
10V
135R
135R
Input
0-5V
OFF
OFF
OFF
OFF
OFF
1-5V
OFF
ON
OFF
OFF
OFF
0-10V*
OFF
OFF
ON
OFF
OFF
2-10V*
OFF
ON
ON
OFF
OFF
0-20mA
ON
OFF
OFF
OFF
OFF
4-20mA
ON
ON
OFF
OFF
OFF
0-135 OHM
OFF
OFF
OFF
ON
ON
*If the 0-10V range is selected, the NWVS will start responding with output
just above 0V on the command input. If the 2-10V range is selected, the
NWVS will start responding with output just above 2V on the command input.

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Rev7.4 NUWAVE TECHNOLOGIES,INC.
5.2 Stage Selection
S2 positions 1-4 select the number of output stages.
Switch
S2
Position→
1
2
3
4
Label→
STP3
STP2
STP1
STP0
Stages
1
OFF
OFF
OFF
OFF
2
OFF
OFF
OFF
ON
3
OFF
OFF
ON
OFF
4
OFF
OFF
ON
ON
5
OFF
ON
OFF
OFF
6
OFF
ON
OFF
ON
7
OFF
ON
ON
OFF
8
OFF
ON
ON
ON
9
ON
OFF
OFF
OFF
10
ON
OFF
OFF
ON
11
ON
OFF
ON
OFF
12
ON
OFF
ON
ON
13
ON
ON
OFF
OFF
14
ON
ON
OFF
ON
15
ON
ON
ON
OFF
16
ON
ON
ON
ON
5.3 Output Mode Selection
LIFO (last in first out) and FIFO (first in first out) modes are both available by
setting of S2 position 6.
Switch S2
Position→
6
Label→
FIFO
Output Mode
LIFO
OFF
FIFO
ON
LIFO mode is the normal default mode. In this mode the output stages
respond to the command input like a level bar graph.
FIFO mode circulates the on stages to promote even use of the contactors
and elements. For example, the first stage that was turned on when the
power was increasing will be the first stage turned off when the power is
decreasing.

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Rev7.4 NUWAVE TECHNOLOGIES,INC.
5.4 Master/Slave Selection
S2 position 5 selects master or slave operation.
Switch S2
Position→
5
Label→
SLV
Master/Slave Select
Master
OFF
Slave
ON
When the NWVS is set for slave operation, the command input becomes the
slave input. The slave’s command input is wired to the master’s slave output.
5.5 Vernier Output Type Selection
S1 position 6 selects Analog or Time Proportioning Vernier Output.
Switch S1
Position→
6
Label→
ANLG
Analog/Time Proportioning
Time Proportioning
OFF
Analog
ON
When Time Proportioning is selected, the Vernier output is a 24VDC current
limited 4 second cycle time PWM signal. The SSR used to control the Vernier
heater is driven from terminals TP+ and TP-.
When Analog is selected, the Vernier output is a 0-10V analog signal for
driving a phase angle controller. The 0-10V signal is present on the AN+ and
GND terminals.
6. Adjustment Potentiometers
6.1 Stage Delay Adjustment
The Stage Delay is the time that it takes for additional stages to turn on or
off. The Stage Delay is adjustable from 0-180 seconds (0-3 minutes). The
stage delay must be set above zero or excessive contact wear can occur.
If the unit is to be used as a slave, then the stage delay should be set to 0 on
the slave, because the master’s setting of stage delay will control it.
The Test Button will turn on each stage one at a time while pressed and will
turn off the stages at the stage delay time when let go.

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Rev7.4 NUWAVE TECHNOLOGIES,INC.
6.2 Vernier Ratio
The Vernier Ratio is the ratio of the Vernier heater to the heaters used on the
individual stages. The Vernier Ratio is adjustable from 100 - 200%.
•If the Vernier heater is the same power as the individual stage heaters,
then the Vernier Ratio should be set to 100%.
•If the Vernier heater is twice the power of the individual stage heaters,
then the Vernier Ratio should be set to 200%.
7. Test Button
When the test button is held down, the command input is forced to 100% and
all of the stages will turn on at one stage per second. When the button is
released, the stages will turn off at the set stage delay rate.
8. Indicator LEDs
Power LED –On when power is applied.
Individual Stage LEDs –On as each stage is turned on.
Vernier Output LED –Increases in intensity when power is increasing
and Analog is selected. When Time Proportioning
is selected, turns on when the output is energized.
Slave Output LED –Increases in intensity when power is increasing to
the slave input.
9. Outputs
9.1 Relay Outputs
The NWVS uses mechanical relays to switch the coils of the load contactors.
The life span of the NWVS output relays are directly related to the user stage
delay setting as well as the load contactor specifications. Since the stage
delay and the choice of load contactor is determined by the end user, there
is no guarantee or warranty expressed or implied related to the life of the
output relays or load contactors.
9.2 Vernier Output –Time Proportioned Drive Specifications
When Time Proportioning is selected, the Vernier output is a 24VDC current
limited 4 second cycle time PWM signal. The SSR used to control the
Vernier heater is driven from terminals TP+ and TP-. The drive
specifications are power supply related and are shown below.

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Rev7.4 NUWAVE TECHNOLOGIES,INC.
0510 15 20
5
10
15
20
25
30
+10%
SSRINPUTVOLTAGEDROP(VDC)
SSRDRIVECURRENT(mADC)
-10%
24VAC(NOMINAL)
SSR DRIVE CURRENT vs SSR VOLTAGE DROP AND POWER SUPPLY
9.3 Vernier Output - Master/Slave Configuration
In a Master-Slave Configuration, the master unit’s Vernier output should be
used for driving the SSR or SCR Power Control.
10. Electrical Specifications
Power Input - 24VAC -15/+15% 50/60Hz < 10VA.
24V Thermostat Power - Aux Output Rated at 24VAC @ 500mA max.
Brown Out Protection - Stages restart from zero upon loss of power.
Command Inputs - 0-5V, 1-5V, 0-10V, 2-10V, 0-20mA, 4-20mA, 0-135Ohm.
Selectable via dipswitch.
Stages - Selectable from 1 to 16 stages via dipswitch. More than 8
stages requires an additional NWVS setup for slave operation.
Stage Outputs - 30 VAC @ 1.0A SPST Mechanical Relays w/MOV protection,
up to a max of 5A total for all of the stages. Up to 8 stages per
board. Use a Class 1 ( properly fused ) or Class 2, CSA or UL
recognized transformer for power supply & relay outputs.
Vernier Output - Selectable via dipswitch # S1-6:
Time Proportioning (S1-6 OFF): Current limited ~24VDC
nominal. Time Proportioned 4 second cycle time for driving an
SSR.
Analog (S1-6 ON): 0-10VDC output for driving an SCR power
control. 10VDC output tolerance is +5/-8% at 24VAC power.
10VDC output tolerance is +5/-25% at 20VAC power.
Slave Output - 0-5V output for expanding beyond 8 stages.
Stage Output Modes - LIFO or FIFO Selectable via dipswitch.