fachgesprach 16 ddc controller digital outputs · ddc controller digital outputs ... the most...
TRANSCRIPT
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Fachgesprach – 16
DDC Controller Digital Outputs
6-8-2017 8:00 PM By Mat Ansari PE
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Digital Output
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What is the Purpose of this Discussion?
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12 Question Checklist – For Good Design
LOAD:1. What Voltage level/type does it require?2. How many Amps does it draw? Or VA?
POWER:3. Where is this Power coming from (Next Slide)?
(Only 1 power source in one loop.)4. Type AC or DC - does it match LOAD?5. Voltage Level – does it match LOAD?6. Power source VA sufficient for LOAD?7. What if there are multiple LOADS?
CONTROL SWITCH:8. Where is it located in the circuit? (May not be as
shown on sketch.)9. What are the Switch Amp and Voltage rating?10. Can it carry the LOAD Current and Voltage?
SURGE PROTECTION:11. Required?12. Built-in?
Equivalent Circuit
Every DO MUST Form This Simple Loop
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You can get 24Vac here(PS Terminal Block)
Install new 24 Volt transformer in a box with 120 Volt power and disconnect switch
You can get 24Vac here(Sourcing Triacs)
V-dc usually sourced by controllers
There is usually a control transformer in the motor starter – if everything matches you can think about using that
Power Source For DO
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The Most Common Load Type On Digital Outputs
Relay Coil Symbols
To Power a coil you MUST KNOW:• AC or DC• Voltage• Amp Draw• AC Inrush• Kick-back Protection
Relay Coil
Remember: This coil is the "LOAD" on our Digital Output.A coil is an inductive load.
Relay Contacts Ratings and Transient Voltage Suppression will be our next discussion. So we will not discuss it today.
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Heater5 Vdc
Ground
ON = 5 Vdc
Relay5 Vdc Coil"Logic Level Coil"
20 mA max. ??
Contacts can be designedfor higher voltage and currentSurge Diode not shown
To Heater Start
At The Very Bottom of it all – this happens
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Electronic Leverage
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Electronic Leverage
DO-1
NO
C
Next SlideShows coil wiring
Can we omit the middle relay and go direct to Starter?Wait till later slides.
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Heater5 Vdc
Ground
ON = 5 Vdc
20 mA max. ??
InternalPower
Digital Output
Relay – Dry Contacts
Contact Rating??
Note:Don’t get hung up on the electronics here.Not all components shown.
You can use this for power or a separate one
Troubleshooting
Internal
HOW MICROCONTROLLERS TURN RELAYS ON/OFF
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Motor Starter and Disconnect in MCCHOA Switch on Starter
"Layout-Awareness" – Component Locations
WAC SuppliedControl Panel
Locate Close to Input/Sensors
MCC byElectrical
How Far?
Transformer Disconnect
Starter
Hawkeye
Sometimes, the starters are free-standing, not in a MCC
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Con ta ct H O A
1A – 1b C l o s e d O P E N o p e n
2A – 2B O P E N O P E N c l o s e d
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ON = 5 Vdc
20 mA max. ??
Internal
Let us wire up a motor
start/stop using a HOA switch
24 Vac or 120 Vac
24Vac
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ON = 5 Vdc
20 mA max. ??
Internal
Delete The Pilot (Middle) Relay?
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Never Mix Transformer Power
ControlTransformer #1
ControlTransformer #2
Never do this!To parallel transformers you need to match both polarity and phase. If you inadvertently do as shown here – chances are very good that smoke will come out of the control panel.
24 Volts 24 Volts
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Smart Controls Triac Outputs
Inside the Smart Controls Unit
Notes:TVS not shownHow to troubleshoot?
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Wiring Smart Controls Triac Outputs
120 VacOr24 Vac
Can we get rid of this relay and go direct to starter?
24Vac
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Distech Triac Output
Need an external 24VacPower Supply to pull in a relay coil
Troubleshooting
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Distech Discrete Output
Need a 12 Volt DC Coil Relay(Powered by Controller)
Troubleshooting
TVS
12 Volt DC Coil
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Sourcing Vs Sinking Outputs
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Smart Controls SC-160
TVS on back side
Triac1 Amp
OptoCoupler
24 Vac
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22Distech ECP-203
Triac0.5 Amp
OptoCoupler
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The
End
Next Discussion:
• TVS - Transient Voltage Suppression
• Relay Contacts and Triac Ratings
• Control Transformer Sizing
(All Above Are Related Topics)