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9-88
Coral IPx 500 Installation Manual
R
elay Contacts
RL
Y
1
, RL
Y2, RL
Y3
9
If the contact is to operate a relay or solenoid, use an alternating current (AC) operated
device and an AC power source, if at all possible. AC operated inductive loads
produce much lower arc levels than direct current (DC) operated loads.
If the contact must operate a DC powered inductive load, the contact must be
adequately protected by arc suppression devices.
Figure 9-25
illustrates the use of a
common rectifier diode as a simple arc suppression device. The diode is normally
reverse biased (not conducting) with the cathode (top side in the drawing) connected
to the positive side of the power source.
Figure 9-25
DC Arc
Suppression for MSBipx
Relays
When the inductive load is powered, a magnetic field is created around the coil
windings. When power is removed, the magnetic field quickly deteriorates, producing
a reverse polarity voltage (counter EMF) across the windings. This reverse polarity
voltage is typically many times the voltage which originally powered the coil,
providing enough potential to arc across the open relay contacts.
By placing the diode in the circuit, the reverse polarity current is conducted by the
diode, shunting the energy around the contacts. A rectifier rated at 1.0 ampere forward
current (1.0A I
F
) and a peak inverse (reverse) voltage of at least 250 volts (250V, PIV,
PRV, or V
RM
) should be sufficient in most cases.
MSBipx
Coral
IPx 500
x
x
RLYx
RLYx
D.C.
Power
Supply
Relay
Spike
Suppression
Diode
(+)
(-)
3
Auxiliary
Connector
RLY
2
12
37
13
38
14
39
1
Содержание Coral IPx 500
Страница 1: ...Coral IPx 500 Installation Procedure and Hardware Reference Manual The flexible way to communicate...
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Страница 58: ...2 16 Coral IPx 500 Installation Manual Site Inspection 2 NOTES...
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Страница 126: ...3 6 Coral IPx 500 Installation Manual Power Supply Test 3 NOTES...
Страница 146: ...3 26 Coral IPx 500 Installation Manual I O Cable Installation 3 Figure 3 6 Champ Fastening to Top Section of the Cage...
Страница 149: ...Initial Power up Tests 3 29 I O Cable Installation 3 Figure 3 8 MDF Connector Configuration Left View...
Страница 152: ...3 32 Coral IPx 500 Installation Manual Installation Wrap up 3 NOTES...
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Страница 184: ...5 14 Coral IPx 500 Installation Manual Protection Devices 5 NOTES...
Страница 188: ...5 18 Coral IPx 500 Installation Manual Power Fail PF Transfer Circuits 5 NOTES...
Страница 204: ...5 34 Coral IPx 500 Installation Manual MDFipx Units Supplied by the Manufacturer 5 NOTES...
Страница 254: ...5 84 Coral IPx 500 Installation Manual Peripheral Card with RJ 45 DA 15S Connections For Coral Interface Cards 5 NOTES...
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Страница 288: ...6 32 Coral IPx 500 Installation Manual Coral IPx 500M Main Cage Description 6 NOTES...
Страница 296: ...6 40 Coral IPx 500 Installation Manual Coral IPx 500X Expansion Cage Description 6 NOTES...
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Страница 332: ...7 16 Coral IPx 500 Installation Manual PS500 DC Power Supply Unit 7 NOTES...
Страница 350: ...7 34 Coral IPx 500 Installation Manual PS500 AC Power Supply Unit 7 NOTES...
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Страница 380: ...8 4 Coral IPx 500 Installation Manual Control Cards 8 NOTES...
Страница 404: ...8 28 Coral IPx 500 Installation Manual IMC8 Card Flash Erasable Software Memory Unit 8 NOTES...
Страница 412: ...8 36 Coral IPx 500 Installation Manual DBX Card Database Expansion Memory Unit 8 NOTES...
Страница 422: ...8 46 Coral IPx 500 Installation Manual CLA Card CoraLINK Adapter 8 Figure 8 15 CLA with RJ 45 Connection...
Страница 426: ...8 50 Coral IPx 500 Installation Manual CLA Card CoraLINK Adapter 8 NOTES...
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Страница 432: ...9 4 Coral IPx 500 Installation Manual Shared Service Circuitry Installation 9 NOTES...
Страница 452: ...9 24 Coral IPx 500 Installation Manual IPx 500M Backplane Main Service Board inside the IPx 500M Cage 9 NOTES...
Страница 460: ...9 32 Coral IPx 500 Installation Manual Three Way Conference Conference Circuitry 9 NOTES...
Страница 490: ...9 62 Coral IPx 500 Installation Manual KB1 KB2 KB3 RS 232E Data Serial Port 9 NOTES...
Страница 498: ...9 70 Coral IPx 500 Installation Manual Music Background and Music On Hold M1 M2 9 NOTES...
Страница 518: ...9 90 Coral IPx 500 Installation Manual Relay Contacts RLY1 RLY2 RLY3 9 NOTES...
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Страница 526: ...10 6 Coral IPx 500 Installation Manual Peripheral Card Installation 10 NOTES...
Страница 534: ...10 14 Coral IPx 500 Installation Manual Peripheral Card Description XXXipx and XXXsl Cards 10 NOTES...
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