Precision Digital Corporation PD6622-L2N, Инструкция по эксплуатации

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Loop Leader PD6620 Series Loop-Powered Flow Rate/Totalizers Instruction Manual
13
Wiring Diagrams
Safe Area Current Loop (4-20 mA)
Connections
• PD6626 and PD6628 installation must be
performed in accordance with Control Drawing
LIM6600-2 in order to meet agency approval
ratings.
Signal connections are made to a six-terminal con-
nector labeled SIGNAL on
Figures 5-8
on page
12
.
The following figures show a 4-20 mA current loop
connected to the meter. Figure 9 shows the connec-
tion without the backlight and
Figure 10
shows the
connection with the backlight (the backlight can be
disabled/enabled in the
SYSTEM
menu). The meter is
powered by the 4-20 mA current loop.
There are no switches or jumpers to set up for the in-
put. Setup and programming is performed through the
front panel buttons or PC-based software.
Figure 9. 4-20 mA Input Connection without Backlight
Figure 10. 4-20 mA Input Connection with Backlight
The current input is protected against current
overload up to 1 amp. The display may or may not
show a fault condition depending on the nature of the
overload.
Safe Area Digital Input Connection
A digital input is standard on the meter. This digital
input is connected with a normally open contact
across DI+ and DI-, or with an active low signal
applied to DI+ and DI-.
Figure 11. Digital Input Connections
Safe Area 4-20 mA Output Connections
Connections for the 4-20 mA transmitter output are
made to the connector terminals labeled mA OUT.
The 4-20 mA output must be powered from an
external power supply.
Figure 12. 4-20 mA Output Connections
Safe Area Solid State Relay Connections
Relay connections are made to a four-terminal
connector labeled SSR1 and SSR2 on Figure 6.
Connector Labeling for PD6620 with 2-Solid State
Relays
and
Figure 8. Connector Labeling for PD6620
with 2 Solid State Relays & 4-20 mA Analog Output
on page
12
. Each relay’s C terminal is common only
to the normally open (NO) contact of the
corresponding relay.
Figure 13. Solid State Relay Connections
Safe Area Open Collector Outputs
Open collector output 1 and 2 connections are made
to terminals labeled O1+ and O1-, and O2+ and O2-.
Connect the alarm or pulse input device as shown
below.
Figure 14. Open Collector Output Connections
DI+ DI- mA- mA+ BL- X
DI+ DI- mA- mA+ BL- X
DI+ DI- mA- mA+ BL- X
I+ I-
O1+ O1- O2+ O2-