Powtier Controls ACC-6-00 User manual

Air Curtain
Heater and Fan Controller
Instruction Manual
Copyright © 2005-7 Powtier Controls Limited
This document contains proprietary information which is protected by copyright. All rights reserved. This document or parts thereof may not
be reproduced in any form without written permission of the publishers.
The information in this document is subject to change without notice and should not be construed as a commitment by Powtier Controls
Limited. Powtier Controls Limited shall not be liable for errors contained herein or for incidental or consequential damages in connection
with the furnishing, performance or use of this material.

Powtier Controls Limited Air Curtain Controller
Instruction Manual
Table of Contents
Introduction.................................................................................................................................3
Block diagram.............................................................................................................................3
Description..................................................................................................................................4
Power supply...............................................................................................................................4
Sensor input.................................................................................................................................4
Control output.............................................................................................................................4
User interface..............................................................................................................................4
Installation...................................................................................................................................5
Base unit.................................................................................................................................5
Remote unit............................................................................................................................5
Communication......................................................................................................................5
Protection....................................................................................................................................6
Connection diagram....................................................................................................................6
Connection terminals (base unit)................................................................................................7
Connection terminals (remote unit)............................................................................................8
Layout diagram (base unit).........................................................................................................9
Layout diagram (remote unit)...................................................................................................10
Dimensional drawing (base unit)..............................................................................................11
Operation parameters................................................................................................................12
Control......................................................................................................................................13
Alarms.......................................................................................................................................14
Technical specification.............................................................................................................15
Ordering information................................................................................................................16
Supplier information.................................................................................................................16
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Powtier Controls Limited Air Curtain Controller
Instruction Manual
Introduction
This instruction manual describes a dedicated temperature and fan controller used to control
the air curtain (ACC).
When the measured temperature is lower than the setpoint temperature, the output will cycle
between its minimum and maximum output settings.
All user adjustments are by means of front panel push buttons on the remote control unit, with
indication of setting and measurement by 7-segment LED display.
Block diagram
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Instruction Manual
Description
The Air Curtain Controller (ACC) consists of a base unit and a remote unit. The base unit
houses the power supply, sensor input conditioning circuitry, microcontroller, output drive to
heaters and fan, thermal trip protection, Building Management System (BMS) control logic
and interface to the remote unit.
The remote unit forms the operator panel which consists of three 7-segment Light Emitting
Diode (LED) display for temperature and parameters indication and three push buttons for
control and setting adjustments.
All the connections to the controller are via screw terminals.
Power supply
The ACC requires 3 phase 4 wire 415Vac 50/60Hz supply.
Sensor input
A high accuracy Negative Temperature Coefficient (NTC) temperature sensor is supplied as
standard.
Control output
Opto-triac outputs are used for the control of heater output. The rating is 3 phase 3 wire
415Vac, up to 24KW max.
Relay outputs are used for the control of the fan speed; high, medium, low or off.
User interface
The user interface comprises of 3 digits 7-segment red LED display and 3 push buttons.
The 7-segment display is used to indicate measured temperature, setpoint temperature, heater
On/Off setting, fan speed setting. It is also used to show other engineering parameters (in
engineering view mode) such as proportional band, current output power, heatsink
temperature, zero and span reference, air alarm setting, heatsink alarm setting and minimum
power setting.
One push button is used to scroll the parameter display. Two adjustment push buttons "UP"
and "DOWN" are used to increment and decrement the parameters settings.
Please note after 3 minutes of inactivity on the push buttons, the display will revert to
showing air temperature or alarm.
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Instruction Manual
Installation
Base unit
The ACC base unit is installed inside the air curtain unit. The ACC remote unit is installed in
a separate housing. Please see layout diagrams and dimensional drawing for fixing.
The distance between the base unit and the remote unit can be up to 50M maximum.
All the electrical connections are via screw terminals. There are 6 sets of connections.
The 3 phase mains supply is connected to the middle of the 1x3 way and left side of the 2x2
way connector marked "R", "Y", and "B" and the neutral is connected to a left side of the 1x3
way connector marked "N".
The heater output is connected to the right side of 1x2 and 2x2 way connector marked
"Load1", "Load2" and "Load3".
The fan output is connected to a 6 way connector marked "N Lo Md Hi".
The sensor input (air sensor) is connected to a 2 way connector marked "AIR" on the base
unit. The sensor is not polarity sensitive.
The BMS control logic (volt-free contact) is connected to a 2 way connector marked "BMS".
The input is normally closed to enable the fan and heater output. The connection is not
polarity sensitive.
The external thermal trip (volt-free contact) is connected to a 2 way connector marked "Trip".
The input is normally closed to enable the fan and heater output. The connection is not
polarity sensitive.
Remote unit
The remote unit is connected to the base unit through 1 set of 4 way connectors marked "B, A,
0V and 7V".
For multiple base units sharing a single remote unit, the 7V supply connection should be
connected to just one base unit or it can be supplied locally using a separate 5.5 to 10V
100mA dc supply.
Communication
The communication link between the base and the remote unit are designed to accommodate
multiple base units sharing a single remote unit.
If there is more than one base unit sharing the same remote unit, each base unit must have its
own unique address. There is a 4 way dual-in-line switch marked ADDR on the base unit.
This can be used to set the base unit address from 0 to 15.
The left most switch is the Least Significant Bit and the right most switch is the Most
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Powtier Controls Limited Air Curtain Controller
Instruction Manual
Significant Bit. To change the address to 0, set all 4 switches to 0 or Off. To change the
address to 15, set all 4 switches to 1 or On. To change the address to 1, set the left most
switch to On and the rest to Off. To change the address to 8, set the right most switch to On
and the rest to Off.
The base unit is shipped with a default address of 0.
Protection
There are two high speed fuses on the base unit to protect the switching devices for the heater.
External circuit breaker with the appropriate rating should be installed for the protection of
the installation.
Connection diagram
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Instruction Manual
Connection terminals (base unit)
Terminal Description
R 3 phase supply
Y 3 phase supply
B 3 phase supply
N Neutral from mains
Load1 Heater phase 1
Load2 Heater phase 2
Load3 Heater phase 3
N Neutral to fan
Lo Fan - low speed
Md Fan - medium speed
Hi Fan - high speed
BMS BMS control logic, normally closed (volt-free contact)
BMS BMS control logic, normally closed (volt-free contact)
AIR Air sensor (non-polarised)
AIR Air sensor (non-polarised)
Trip External thermal trip, normally closed (volt-free contact)
Tip External thermal trip, normally closed (volt-free contact)
B RS485 Comms to remote unit
A RS485 Comms to remote unit
0V Supply to remote unit
7V Supply to remote unit
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Instruction Manual
Connection terminals (remote unit)
Terminal Description
7V Supply from base unit
0V Supply from base unit
B RS485 Comms to base unit
A RS485 Comms to base unit
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Instruction Manual
Layout diagram (base unit)
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Instruction Manual
Layout diagram (remote unit)
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Instruction Manual
Dimensional drawing (base unit)
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Instruction Manual
Operation parameters
Parameters in the ACC are accessed by pressing the scroll button. All the adjustable
parameters can be set within their limits using the UP and DOWN button.
The following is the list of parameters:
Symbol Description Low Limit High Limit Default Unit
a Alarm 1 31
t Air temperature 0 99 °C
U Unit address 0 15
S Setpoint 16 35 22 °C
H Heat Off/On 0=Off 1=On 1
F Fan Off,low,med,high 0=Off 3=high 3
P Proportional band 1 5 3 °C
o Power output 0 99 %
h Heatsink temperature 0 99
r Zero reference 0 FF Eng.unit
n Span reference 0 FF Eng.unit
1 Air alarm setting 50 90 60 °C
2 Heatsink alarm setting 50 90 65 °C
3 Minimum Power setting 0 99 0 %
The default display on the remote unit is the air sensor temperature [Air temperature - t]. This
will change to alarm display if there is active alarm.
The unit address, ranged 0 to 15, enables the remote panel to communicate with up to 16 base
units on the same RS485 communication connection.
In user mode (default), only Measured temperature, Setpoint, Heat and Fan settings are
accessible.
The other parameters are only available in Engineering mode. This mode is entered by
pressing any one of the 3 push buttons on the remote unit when switching on the power to the
remote unit.
There are display only parameters such as Power output, Zero reference and Span reference
which for test and diagnostics only.
Configuration parameters such as Proband, Air alarm setting, Heatsink alarm setting and
Minimum Power setting are also included.
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Instruction Manual
Control
The ACC is designed such that when the measured temperature is below the setpoint
temperature, depending on the Proportional Band (proband) setting, the output will assume
the value shown in the table below.
Percentage of full heat
Proband Setpoint & above -1°C -2°C -3°C -4°C -5°C
5 Minimum Power% 20% 40% 60% 80% 100%
4 Minimum Power% 25% 50% 75% 100%
3 Minimum Power% 33% 66% 100%
2 Minimum Power% 50% 100%
1 Minimum Power% 100%
The setpoint temperature can be adjusted between 16 to 35 on the Remote unit through the
parameter [Setpoint - S]. Due to air chill factor, the actual setpoint used internally for control
will be lifted by several degrees depending on the Fan setting. For example, when the setpoint
is 20, and the fan is set at high speed (3), the control setpoint will be 20+8=28.
Internal setpoint lift due to air chill factor
High = 8°C
Medium = 6°C
Low = 5°C
The proband can be adjusted between 1 to 5 on the Remote unit through the parameter
[Proportional band - b]
The heater output can be switched off from the Remote panel by selecting the parameter [Heat
Off/On - H]; Off [=0], On [=1]. This will also switch off the heatsink fan unless the heatsink
temperature is higher than 50°C.
There is also a fan control selection [Fan off,low,mid,high - F] on the Remote unit which
enables the fan to switch between high speed [=3], medium speed [=2], low speed [=1] and
off [=0].
The output cycle time for the heater output is fixed at 0.3s and cannot be changed.
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Instruction Manual
Alarms
The ACC raises an alarms if any of its inputs are outside their normal working scope.
The alarms are displayed on the Remote unit as an "alarm" code with a prefix "a".
The following are the list of alarms on the ACC.
Communication failure
Code 1 - this is triggered when the communication between the Base unit and the Remote unit
fails.
Air sensor too hot
Code 2 - this is triggered when the air sensor detects the ambient temperature above 60°C.
Air sensor failure
Code 4 - this is triggered when the air sensor is open circuit, typically when the air sensor is
broken or disconnected.
Heatsink too hot
Code 8 - this is triggered when the heatsink sensor detects the temperature of the heatsink
above 65°C.
Heatsink sensor failure
Code 16 - this is triggered when the heatsink sensor is open circuit, typically when the
heatsink sensor is broken or disconnected.
As the alarms are not mutually exclusive, the Alarm code displayed on the Remote unit are
accumulative. For example, if both air sensor failure (4) and heatsink sensor failure (16)
occur, the Remote unit will display "a 20" as the Alarm code.
Apart from the Communication failure alarm [Code 1], which could be due to a broken
connection of the RS485 link between the Base unit and the Remote unit, all other alarms will
cause the Base unit to switch off the heater output.
The ACC is protected from any short circuit on the air sensor or heatsink sensor as the short
circuit will cause the temperature to go high and trigger over temperature alarm.
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Technical specification
Sensor input NTC
Control Setpoint 16 to 35 ºC in steps of 1 degree
Temperature Control Proportional with 1ºC hysteresis
Proportional Band 1 to 5 ºC
Air sensor alarm 50 to 90 °C
Hestsink sensor alarm 50 to 90 °C
Minimum Power 0 to 99 %
Cycle time 0.3 seconds fixed
External thermal trip Volt-free contact, normally closed to enable
BMS control logic Volt-free contact, normally closed to enable
Heater Output 9,12,18 or 24KW 3 phase 3 wire 415Vac
6KW 1 phase 240Vac
Protection 2 x 30A high speed fuse
for the protection of the heater switching devices
Fan Output 3 off Relay for High, Medium and Low Fan setting
3A max 240Vac
Display Three 7-segment LED red for parameter display
Push buttons 3 positive feedback tactile push buttons
Connection Screw terminals
4 for supply
3 for heater output
4 for fan output
2 for sensor input
2 for external thermal trip
2 for BMS control logic
4 for remote panel
Control Supply 415 Vrms +/-15% 50/60Hz 5VA max.
or 240Vrms +/-15% 50/60Hz 5VA max
Dimensions Base unit 234mm(L) x 100mm(W) x 92mm(H) max.
Remote unit 101mm(L) x 101mm(W) x 60mm(H) max.
Mounting positions Base unit - external bracket (not supplied)
Remote unit - Fixing centres 90mm x 90mm
Weight 2Kg max.
Temperature 0 to 50 ºC operating; -20 to 65 ºC storage
Warranty 12 months return to base
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Instruction Manual
Ordering information
Ordering code: ACC-xx-00
where xx is either 6, 9, 12, 18 or 24 representing the KW rating of the unit.
You are welcome to order the unit by code or description - Air Curtain Temperature
controller.
For example, ACC-12-00 is an Air Curtain controller with 415V supply and 12KW load
maximum.
or ACC-6-00 is an Air Curtain controller with 240V supply and 6KW load maximum.
Ambirad Part numbers:
Remote Unit 900306
Base Unit 6KW to be confirmed
Base Unit 9KW 900307
Base Unit 12KW 900308
Base Unit 18KW 900309
Base Unit 24KW 900310
Supplier information
Powtier Controls Limited
Unit 4 Parkland Business Centre
Chartwell Road, Lancing
West Sussex BN15 8UE England
Tel: [phone]
Fax: [phone]
[email protected]
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