Precision Digital PD941 - Manual (Page 9)

ConsoliDator Multi-Channel Controller Instruction Manual
9
Relays
RATING SPDT (form C); rated 10 A @ 120/240 VAC or 5 A @ 28 VDC
resistive load; 1/3 HP @ 120/240 VAC for inductive loads.
Minimum load: 50 mA for AC, 10 mA @ 5 VDC
ISOLATION 1500 VAC between coil and contacts
DEADBAND 0-100% of full scale, user selectable
ELECTRICAL NOISE
SUPPRESSION An external suppressor (snubber) should be connected to each
relay contact switching inductive loads, to prevent disruption to
the microprocessor’s operation.
Recommended suppressor value: 0.01 µF/470
, 250 VAC
(Order: PDX6901.)
ASSIGNMENT &
OPERATION Any relay may be assigned to any analog or flow meter pulse
input channel. Multiple relays may be assigned to the same
channel. All relays are programmed independently.
High or Low Alarm: Assign to analog or pulse channel for on/off
relay control.
Multi-Channel High or Low Alarm: Assign two or more analog
channels. Indicate common high or low condition.
Annunciator High or Low: Assign to analog or pulse channel for
on/off relay control with reset capability from digital input switch.
Summary Alarm: Use to indicate any relay entering alarm state.
Supervisory Alarm: Use to indicate CPU failure or analog input
signal loss.
High or Low Pulse Action: Assign to analog or pulse input
channel for pulsing on/off timed relay control. Programmable
pulse width and delay.
Trigger: Assign to pulse channel for indication of user-defined
total increment. Programmable for scaled pulse output.
Plunger Lift: Assign to analog and/or pulse channels to control a
plunger lift system.
Lead-Lag Alternation (Sequence): Link multiple relays for
sequential operation. (Up to 9 relays.) Programmable override set
points to turn on up to 5 relays.
Pulse Width Modulation: Assign to analog or pulse channel for
on/off signal modulated by input. User selectable cycle time.
PI Control: Assign to analog or pulse channel for Proportional
plus Integral on/off modulated duty cycle. Manual tuning required.
MANUAL
OVERRIDE Override any relay (Password restricted.) Relays do not respond
to input in this mode.
ACKNOWLEDGE Front panel ACK key resets relays in Supervisory, Summary and
Annunciator Alarm Modes.
TIME DELAY Programmable on/off delays, 0-999.9 sec
Independent for each relay.
AUTO
INITIALIZATION When power is applied to the controller, relays will reflect the
state of the input to the controller.