MKS HPS 947 Series, Руководство по эксплуатации и обслуживанию, Страница: 21 / 40

15
HPS
®
Products Series 947 CEP System
Do not inadvertently short circuit the set point relay terminals to
the analog output voltage.
Relay Inductive Loads and Arc Suppression
If the set point relay is used to switch inductive loads, e.g. solenoids, relays,
transformers, etc., the arcing of the relay contacts may interfere with
Controller operation or reduce relay contact life. Therefore an arc suppression
network, shown schematically below, is recommended. The values of the
capacitance
C and the resistance R are calculated by the equations,
C = I
2
/(1 x 10
7
) and R = E/I
a
where,
C is in farads
R is in ohms
I is DC or AC
peak
load current in amperes
E is DC or AC
peak
source voltage in volts
a = 1 + (50/E).
Note that,
R
min
= 0.5 W and C
min
= 1.0 x 10
-9
F.
Relay arc suppression network