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DP6060 Dual-Input Process Meter
Relay Operation Details
Overview
The relay capabilities of the meter expand its usefulness beyond simple
indication to provide users with alarm and control functions. These
capabilities include front panel alarm status LEDs as well as either 2 or
4 optional internal relays and/or 4 external relays expansion module.
Typical applications include high or low temperature, level, pressure or
flow alarms, control applications such as simple on/off pump control,
and pump alternation control for up to 8 pumps. There are four basic
ways the relays can be used:
1.
High or Low Alarms with Latching or Non-Latching Relays
2.
Simple On/Off Control with 100% Adjustable Deadband
3.
Sampling (Based on Time)
4.
Pump Alternation Control for up to 8 Pumps
Relays Auto Initialization
When power is applied to the meter, the front panel LEDs and alarm
relays will reflect the state of the input to the meter. The following table
indicates how the alarm LEDs and relays will react on power-up based
on the set and reset points:
Alarm
HI or LO
#
Alarm
1
HI
2
LO
3
LO
4
HI
Fail-Safe Operation
The following table indicates how the relays behave based on the fail-
safe selection for each relay:
Fail-Safe
Non-Alarm State
Selection
NO
Off
Open
On
Closed
Note: NO = Normally Open, NC = Normally Closed. This refers to the
condition of the relay contacts when the power to the meter is off.
Set
Reset
Point
Point
1000
500
700
900
250
400
450
200
Alarm State
NC
NO
Closed
Closed
Open
Open
59
Instruction Manual
Power-Up
Reading
499
499
499
499
Power Failure
NC
Open
Relays go to
non-alarm state
Closed
Relays go to
alarm state
Relay &
LED
Off
On
Off
On
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