Javelin D
Ɣ
Model PD644 Voltmeter
Instruction Manual
9
Relays Option
RATING
2 SPDT (form C); rated 3 A @ 30 VDC or 3 A @ 250 VAC
resistive load; 1/14 HP @ 125/250 VAC for inductive loads
ELECTRICAL
NOISE
SUPPRESSION
A 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
μ
F/470
:
, 250 VAC
(Order PDC model number PDX6901).
DEADBAND
0-100% of full scale, user selectable
HIGH OR LOW
ALARM
User may program any alarm for high or low trip point.
RELAY
OPERATION
Automatic (non-latching)
Latching
Alternation control
Modbus
®
control
RELAY RESET
User selectable via front panel buttons or serial
communication
Automatic reset only (non-latching)
Automatic plus manual reset at any time (non-latching)
Manual reset only at any time (latching)
Manual reset only after alarm condition has cleared (latching)
Automatic reset: Relays will automatically reset when the
input passes the reset point.
Manual reset: Front panel ACK button. Pressing ACK re-
sets all manually resettable relays.
TIME DELAY
0 to 199 seconds, on and off delays
Programmable and independent for each relay
FAIL-SAFE
OPERATION
Programmable
Independent for each relay
AUTO
INITIALIZATION
When power is applied to the meter, relays will reflect the
state of the input to the meter.
Fail-safe operation:
relay coil is energized in non-alarm condition. In
case of power failure, relay will go to alarm state.
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