Sigma Controls MYRIAD DPC Instruction Manual page 23

NOTE: Elapsed times are resettable in the 'SETUP' mode and will 'ROLLOVER' to zero
after 1,000,000 hours if not reset.
MAINTENANCE AND TROUBLE SHOOTING
MAINTENANCE:
The Myriad DPC is a digital solid state device which requires no periodic maintenance.
Occasional physical checks of the unit should be carried out for physical and mechanical
security of mounting, terminal blocks, and electrical wiring.
TROUBLE SHOOTING:
UNIT 'LOCKS UP' – Recycle power to the unit by removing AC power, waiting 10 seconds
and reconnecting power.
NOTE: This should be done by using the user provided circuit breaker or
fuse, not by removing the power wires at the terminal block.
INJURY OR DEATH CAN OCCUR IF CONTACT IS MADE WITH THE
INCOMING AC POWER.
WARNING
LCD display goes dim or contrast is poor. Remove power from the unit, release the 2 rear
mounting screws and slide the unit forward in its case approximately 1 inch. On the left side
of the circuit board is an adjustable potentiometer. With a small screwdriver adjust this "pot"
to alter the contrast to the desired amount. Return the unit to its normal position and secure
the rear screws.
DISPLAY REMAINS AT ZERO OR SHOWS NO CHANGE -- If the display remains at zero or
shows no change but the process is changing, check for D.C. voltage on the loop. With 2
wire (4/20MA) instruments check with a D.C. voltmeter at the level instrument, by
disconnecting the level instrument from its 2 wires and measuring across these 2 wires with
a D.C. voltmeter for the presence of 24VDC.
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