Wiring; Wiring To A Flowline Controller; Switching Inductive Loads - ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual

WIRING

Wiring to a FLOWLINE Controller

LC40 Series Controller (4 or 20 mA output):
LC42 1001 Shown
Switching Inductive Loads: The use of suppressors (snubbers) is strongly recommended when switching
inductive loads to prevent disrupting the microprocessor's operation. The suppressors also prolong the life of
the relay contacts. Suppression can be obtained with a catch diode for DC circuits and a resistor capacitor (RC)
for AC circuits.
Refer to the following circuits for RC network assembly and installation:
Rev A
Catch Diode
Always use stepper relays between the sensor and external loads.
For DC circuits use a catch diode such as 1N4148, shown on left.
Choose R and C as follows:
R: 0.5 to 1 Ohms for each volt across the contacts
C: 0.5 to 1 F for each amp through closed contacts
Notes:
1. Use capacitors rated for 250 VAC.
2. RC networks may affect load release time of solenoid loads. Check
to confirm proper operation.
3. Install the RC network at the meters relay screw terminals. An RC
network may also be installed across the load. Experiment for best
results.
LO900002
LC10/LC11 Series Controller (4 or 20 mA output):
LC11 1001 shown
Step Seven
13 of 20
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