Precision Digital PD554 - Manual (Page 9)

Relay Outputs
RATINGS Out1: 250 VAC @ 3 A or 30 VDC @ 3 A (resistive load)
Sub1, Sub2: 250 VAC @ 1 A or 30 VDC @ 1 A (resistive load)
ELECTRICAL NOISE A suppressor (snubber) should be connected to each
SUPPRESSION relay contact switching inductive loads, to prevent
disruption to the microprocessor's operation.
Recommended suppressor value: 0.1
μF/470 Ω,
250 VAC (PDX6901)
DEADBAND For alarm operations, 0-100% of full scale, user selectable
HIGH OR LOW User may program any relay for high or low trip point
ALARM
DEVIATION ALARM User may program any relay for a high, low, or range set
point deivation alarm.
RELAY OPERATION Any relay may be set as an alarm relay or for time
proportional PID control
TIME DELAY 0 to 99 minutes 59 seconds alarm trip delay user
selectable for each alarm. Time proportional PID control
relay activation time delay of 0 to 99 minutes 59 seconds
user selectable.
FAIL-SAFE Programmable
OPERATION Independent for each alarm relay
AUTO INITIALIZATION When power is applied to the controller, alarm relays will
reflect the state of the input to the controller except
standby alarms.
Analog Outputs
OUTPUT RANGE Continuous PID or retransmitting: 4-20 mA (600 W maximum)
Time Proportional PID: 15 VDC pulse (600 W minimum,
current limited at 30 mA) high, less than 0.1 VDC low, cycle
time 1 to 300 seconds, user selectable
SCALING RANGE Retransmitting 4-20 mA outputs can be scaled for any
display range low and high
ACCURACY +0.1% of full scale
PD550 Series Nova Programmable Process and Temperature Controller Instruction Manual
9