Equflow 6010BCPM Pulse Input Batch Controller Instruction Manual
13
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 resistor-capacitor (RC) networks assembled by the user or purchased
as complete assemblies. Refer to the following circuits for RC network assembly and installation:
Figure 14: AC and DC Loads Protection
Choose R and C as follows:
R: 0.5 to 1
for each volt across the contacts
C: 0.5 to 1 µF 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 controller's relay screw terminals. An RC network may also be installed
across the load. Experiment for best results.
Figure 15: Low Voltage DC Loads Protection
F4 Digital Input Connections
A digital input, F4, is standard on the meter. This digital input connected with a normally open closure
across F4 and COM, or with an active low signal applied to F4.
Figure 16: F4 Digital Input Connections
C
R
C
R
Use a diode with a reverse
breakdown voltage two to three
times the circuit voltage and for-
ward current at least as large
as the load current.
