13 Remove and retain the upper jacking bracket, together with the four associ-
ated M12 nuts, bolts, and washers.
14 Re-fit the bolts to secure the two cable grips, together with the associated
cables, to the mounting plate for the upper jacking bracket).
15 Remove and retain the lower jacking bracket, together with the four associ-
ated M12 bolts and washers.
16 Release the antenna rotation lock in accordance with the instructions.
17 Ensure that no persons are aloft, and when it is safe to do so, set the man
aloft switch to the OPERATIONAL position.
18 Remove the cover from over the circuit breakers, on the PMU.
19 At the PMU, ensure that the three circuit breakers labelled "INPUT POW-
ER", and the three circuit breakers labelled "24V PSU's", are switched off. Ensure that all the other circuit breakers are switched on. The three white indicators labelled "400V 3ุ INPUT" should be on, indicating that there is three-phase input power to the PMU.
20 Switch on the three circuit breakers labelled "INPUT POWER".
21 Switch on the three circuit breakers labelled "24V PSU's". The indicators on
the front panel of the PMU should then be in the following states:
• The two indicators labelled "PSU's" should be on, indicating that the 24
V power supply within the PMU, is available to the SAP command inter-
face in the PMU, and the SAP Control Card in the SAP Management
Unit. After a short delay (about one second), the three indicators
labelled "PITCH SERVO DRIVE", and the three indicators labelled
"ROLL SERVO DRIVE", should be on, indicating that there is three-
phase output power from the PMU to the servo drive units.
• The indicator labelled "BRAKE SUPPLY" should also be on, indicating
that it will be possible to release the platform brakes by using the brake release switch mounted on the SAP Management Unit.
• If the ambient temperature of the SAP Management Unit is above -17ฐC,
the three indicators labelled "SAP CONTROL CARD" should also be on, indicating that the +5 V, +12 V and -12 V supplies are available on the SAP control card in the SAP Management Unit.
• If either the temperature of the SAP Management Unit has fallen below
approximately -17ฐC, or the temperature of the oil has fallen below
approximately -40ฐC, the indicator labelled "HEATING" should be on, indicating that heating is in progress.
Under these circumstances heating will be applied to the oil, and to the SAP Management Unit. The oil pumps will only be operational when the oil is at operational temperature i.e. above -40ฐC. The SAP control card in the SAP Management Unit will only be powered from the PMU when the internal temperature of the SAP Management Unit is above -17ฐC.
Subsequently, the indicator labelled "HEATING" should be on whenever the oil, or the SAP Management Unit, requires heating.
13 Remove and retain the upper jacking bracket, together with the four associ-
ated M12 nuts, bolts, and washers.
14 Re-fit the bolts to secure the two cable grips, together with the associated
cables, to the mounting plate for the upper jacking bracket).
15 Remove and retain the lower jacking bracket, together with the four associ-
ated M12 bolts and washers.
16 Release the antenna rotation lock in accordance with the instructions.
17 Ensure that no persons are aloft, and when it is safe to do so, set the man
aloft switch to the OPERATIONAL position.
18 Remove the cover from over the circuit breakers, on the PMU.
19 At the PMU, ensure that the three circuit breakers labelled "INPUT POW-
ER", and the three circuit breakers labelled "24V PSU's", are switched off. Ensure that all the other circuit breakers are switched on. The three white indicators labelled "400V 3ุ INPUT" should be on, indicating that there is three-phase input power to the PMU.
20 Switch on the three circuit breakers labelled "INPUT POWER".
21 Switch on the three circuit breakers labelled "24V PSU's". The indicators on
the front panel of the PMU should then be in the following states:
• The two indicators labelled "PSU's" should be on, indicating that the 24
V power supply within the PMU, is available to the SAP command inter-
face in the PMU, and the SAP Control Card in the SAP Management
Unit. After a short delay (about one second), the three indicators
labelled "PITCH SERVO DRIVE", and the three indicators labelled
"ROLL SERVO DRIVE", should be on, indicating that there is three-
phase output power from the PMU to the servo drive units.
• The indicator labelled "BRAKE SUPPLY" should also be on, indicating
that it will be possible to release the platform brakes by using the brake release switch mounted on the SAP Management Unit.
• If the ambient temperature of the SAP Management Unit is above -17ฐC,
the three indicators labelled "SAP CONTROL CARD" should also be on, indicating that the +5 V, +12 V and -12 V supplies are available on the SAP control card in the SAP Management Unit.
• If either the temperature of the SAP Management Unit has fallen below
approximately -17ฐC, or the temperature of the oil has fallen below
approximately -40ฐC, the indicator labelled "HEATING" should be on, indicating that heating is in progress.
Under these circumstances heating will be applied to the oil, and to the SAP Management Unit. The oil pumps will only be operational when the oil is at operational temperature i.e. above -40ฐC. The SAP control card in the SAP Management Unit will only be powered from the PMU when the internal temperature of the SAP Management Unit is above -17ฐC.
Subsequently, the indicator labelled "HEATING" should be on whenever the oil, or the SAP Management Unit, requires heating.
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