Connect relays to 7i76
05 Aug 2017 13:24 #97029
by timmert
Replied by timmert on topic Connect relays to 7i76
I connected a 24v power supply to the vfield of the 7i76.
Home switches are working.
But I don't measure a 24V on the output of TB5-output pin 8
Hal file:
# --- COOLANT-FLOOD ---
net coolant-flood hm2_5i25.0.7i76.0.0.output-08
Am I missing something?
Home switches are working.
But I don't measure a 24V on the output of TB5-output pin 8
Hal file:
# --- COOLANT-FLOOD ---
net coolant-flood hm2_5i25.0.7i76.0.0.output-08
Am I missing something?
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05 Aug 2017 13:35 #97030
by PCW
Replied by PCW on topic Connect relays to 7i76
Do you have the correct output pin? (output 8 is TB5 pin 17)
Have you looked at hm2_5i25.0.7i76.0.0.output-08 with halmeter?
Have you looked at hm2_5i25.0.7i76.0.0.output-08 with halmeter?
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05 Aug 2017 13:40 #97031
by timmert
Replied by timmert on topic Connect relays to 7i76
Pin 17, TB5 = output 8
HALmeter switches from false to true when I click the Flood cooling
HALmeter switches from false to true when I click the Flood cooling
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05 Aug 2017 13:49 #97032
by PCW
Replied by PCW on topic Connect relays to 7i76
How are you probing the output? note that the terminal block screw
may not be connected to the output pin if not tightened
may not be connected to the output pin if not tightened
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05 Aug 2017 13:59 #97033
by timmert
Replied by timmert on topic Connect relays to 7i76
Multimeter set to voltage, red wire to the output, black wire to ground
Then I press the coolant switch.
When connected the relay I don't hear it 'clicking'
Then I press the coolant switch.
When connected the relay I don't hear it 'clicking'
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05 Aug 2017 14:05 - 05 Aug 2017 14:05 #97034
by PCW
Replied by PCW on topic Connect relays to 7i76
Is it possible you have the flyback diode backwards?
Is the meter/relay ground on the field ground pin?
(field I/O is isolated so if you have a floating 24V supply, field ground will not be connected to logic ground)
Is the meter/relay ground on the field ground pin?
(field I/O is isolated so if you have a floating 24V supply, field ground will not be connected to logic ground)
Last edit: 05 Aug 2017 14:05 by PCW.
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05 Aug 2017 14:12 #97035
by timmert
Replied by timmert on topic Connect relays to 7i76
I did the following:
A Meanwell 24V power supply
Connected to Vfield of 7i76
Pin 5 and 8
5 = vin logic 8-32V
8 = gnd
From the relay A1 I have a wire to the output 8 (on tb5)
A2 from the relay goes to the central ground point.
I don't have a flyback diode yet.
A Meanwell 24V power supply
Connected to Vfield of 7i76
Pin 5 and 8
5 = vin logic 8-32V
8 = gnd
From the relay A1 I have a wire to the output 8 (on tb5)
A2 from the relay goes to the central ground point.
I don't have a flyback diode yet.
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05 Aug 2017 14:19 #97036
by PCW
Replied by PCW on topic Connect relays to 7i76
Normally you would connect +24V to TB1 pin 1 24V common to TB1 pin 8
and have jumper W1 in the left hand position
Also the relay A2 (and meter black lead) must connect to TB1 pin 8
and have jumper W1 in the left hand position
Also the relay A2 (and meter black lead) must connect to TB1 pin 8
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05 Aug 2017 14:22 #97037
by timmert
Replied by timmert on topic Connect relays to 7i76
Ok
Will try and check tomorrow
What can happen when I dont connect the flyback diode?
Will try and check tomorrow
What can happen when I dont connect the flyback diode?
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05 Aug 2017 14:28 #97038
by PCW
Replied by PCW on topic Connect relays to 7i76
Outputs can be damaged if there is no flyback diode and the relay current is > 60 Ma or so
Normally small 24V relays are fine without a flyback diode since they only draw 20 to 40 mA
The output drivers are designed to drive inductive loads and have flyback protection
but it is not as robust as a flyback diode
Normally small 24V relays are fine without a flyback diode since they only draw 20 to 40 mA
The output drivers are designed to drive inductive loads and have flyback protection
but it is not as robust as a flyback diode
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