C.1) Relay Outputs | C.2) Inductive Loads |
OUT 1 
1
Class 1 
2
NO - OUT 1
C - OUT 1
NC - OUT 1
High voltage transients may occur when switching induc- tive loads. Through internal contacts these transients may introduce disturbances which can affect the perfor- mance of the instrument. The same problem may occur when a switch is used in series with the internal contacts as shown below.
| 3 |
OUT 2 | 6 |
Class 1 |
|
(Alarm) |
|
| 7 |
C
NO
C
R
LOAD
POWER
LINE
The cable used for relay output wiring must be as far away as possible from input or communication cables. Relay output: Protected by varistor.
OUT 1: Form C contact rating of 3 Amps/250 Vac resistive load.
OUT 2: Form A Contact rating of 2 Amps/250 Vac resistive load.
Number of operations: 2 x 105 at the specified rating.
NOTES:
1)To avoid shock and possible instrument damage, connect power last.
2)For power connections use 16 AWG or larger wires rated for 75 °C.
3)Use copper conductors only.
4)Do not run input wires with power cables.
For all the outputs, the internal protection (varistor) assures protection up to 0.5 Amp on inductive loads.
It is good electrical practice to install an additional RC net- work across and as close to the external contacts as possible.
The value of capacitor (C) and resistor (R) are shown in the following table.
Load | C | R | P | Resistor and |
Current | (∝F) | (Ω ) | (W) | Capacitor Voltage |
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< 40 mA | 0.047 | 100 | 1/2 | 260 Vac |
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< 150 mA | 0.1 | 22 | 2 | 260 Vac |
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|
|
|
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< 0.5 Amp | 0.33 | 47 | 2 | 260 Vac |
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1 0
| 10 | 9/17/02, 2:39 PM |
