2.18
Electrical power connections are made to the Control Unit, See Figure 2.8
In the case of systems with an Interface unit (Codes 03, 06,16, 23 and 26) then an electrical supply
is also required for the Interface unit. The data link between the Interface unit and Control unit is
isolated and floating so the two supplies will usually be separately switched.
If a centre tapped electrical power supply is used (eg 55-0-55V) then both poles must be switched
and fused.
On installations where the electrical supply is not referenced to ground an isolating transformer must
be fitted and its secondary winding suitably grounded. If there is a possibility of the electrical supply
carrying interference into the analyser then a filter should be fitted adjacent to the analyser. A
suitable filter is available from Servomex, part number 01100 981 (BASEEFA and FM approved)
or 01100 959 (CSA approved).
Adaptors are included to enable 20mm glands to be fitted to 22mm gland holes.
2.6.1 Voltage Selection
CAUTION
1100H systems using the 1132 Transducer are supplied to operate from
110V or 220V nominal electrical supplies. Transformer tappings may only
be changed between 100, 110, 117V or between 220, 240V respectively.
If it is necessary to change between the 110V and 220V ranges,
consult Servomex.
The transformer has tappings to accommodate the following nominal supply voltages:
100, 110, 117, 220, 240V a.c. (48 to 62 Hz).
The instrument is normally supplied for the voltage specified initially by the user. If it is necessary
to select a different voltage tapping, proceed as follows:
WARNING
Electrical Hazard
Before attempting the following disconnect the electrical supply.
1. Loosen the four captive socket screws, located at each corner of the Control unit, with an
M6 socket wrench. Pull the front panel forward until the hinge located on the right of the
door reaches its limit and open the door fully to the right. The power supply unit is located
at the lower right-hand side of the instrument.
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