Large Display Temperature Meters
Instruction Manual
20
Power Selection
Overview
Power Selection involves the following:
1. Changing to 230 VAC power if needed. 115 VAC is factory default on AC
powered models.
2. Labeling the meter as to how it will be powered: 115 VAC or 230 VAC.
Meters powered from 24 VDC are labeled as such at the factory.
Note:
Meters ordered to operate from 24 VDC do not require any special
setup; this option is not field selectable.
Installation and configuration must be undertaken by qualified servicing
personnel.
!
When servicing the PD756 in a hazardous area, all appropriate
hazardous area procedures must be followed.
!
All AC powered meters are shipped from the factory set for 115 VAC
power. Do not apply 230 VAC without first setting up the Digital
Temperature Meter to accept this voltage. Otherwise it will cause
damage to the meter and endanger personnel.
!
Disconnect power prior to performing the following procedures.
All three meters are field selectable for either 115 VAC or 230 VAC
power. Changing the voltage selection involves the removal of the front
cover and the Display PCB, then selecting 115V or 230V on switch S1
located on the Main PCB.
!
Observe polarity for DC powered meters. Applying voltage with reverse
polarity may damage the meter.
Do not apply an AC voltage to DC powered meters. Applying an AC
voltage to DC powered meters will result in damage to the meter and
endanger personnel.
Changing from 115 to 230 VAC Power
To access the 115/230 VAC switch it is necessary to remove the housing cover
and the Display PCB, see
Disassembling the Meter
, page 16.
Once the Display PCB has been removed, switch S1 is visible
.
It is
the large
black component with a red slide switch on the top, located next to the
transformer. For an illustration see:
Figure 31 on page 61 for PD755
Figure 32 on page 62 for PD756
Figure 33 on page 62 for PD757
For 115 VAC operation, the switch shows 115V; for 230 VAC it shows 230V.
Several setup steps are required and connections made while Display PCB is
removed, so it should not be reinstalled just yet. However, to avoid electric shock,
install Display PCB prior to applying power.
