Xylem YSI 182-XT-4, Руководство по эксплуатации

Страница: 18 / 144

Installation System 182-XT-4
3 - 4 ba76027e02 12/2014
* In order to take the relative on-time into account, see following text
Allowing for the relative
on-time in valves
Valves usually switch on periodically for a limited time and then require
the nominal power. Crucial for the load on the power unit of the DIQ/
S 182-XT-4-PR is the time averaged (effective) power requirement that
depends on the relative on-time, ED:
Relative on-time ED = t
On
/ (t
On
+ t
Off
)
The effective power requirement is the product of the nominal power of
the valve component and the relative on-time:
P = P
nominal
* ED
Since ED is always < 1, the effective power requirement is always
smaller than the nominal power of the valve component.
Determining the number
of MIQ power supply
modules
From the value determined for the power requirement, determine the
number of the MIQ power supply modules as follows:
MIQ/JB 0
MIQ/JBR 0
MIQ/CR3 3.0
MIQ/C6 3.0
MIQ/R6 1.5
MIQ/IC2 0.2
+ 2.2 W per connected
WG 20 A2 power supply/isolator
MIQ/CHV PLUS 1.0 x rel. turn-on duration *
DIQ/CHV 0.8 x rel. turn-on duration *
MIQ/Blue PS 0.6
For the control of sensor cleaning systems operated by
compressed air, a relative on-time of max. 0.1 has been
adopted in practice.
Total power requirement P Number of additional
MIQ power supply modules
P
≤
4.5 W 0
P
>
4.5 W 1