Regulator Group Bench Testing - Fiat 411 R Service Manual

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a) Characteristic obtained as generator runs at 2000 R.P.M.§ 'e) Characteristic obtained as generator runs at 2600 R.P.M.,
for regulation group up to No. 088917. for regulation group irom No. 088918 up.
Fig. 142. - Output characteristic on battery, with group at 50$ 3° C (1221 37.4" F].
2. Avoid connecting group terminal 67 to generator terminal 51, even momentarily, because i'reavy'spar-
kling and group contact oxidation would follow and contact welding would also eventually fellow. it is
thus irrctispensable to connect terminals having the same number; as even it wrong connections are
eventually corrected and the group functions regularly, its usefulness would be nonetheless shortened.
3. Shocks to regulator unit should be avoided, especially to its lower part containing the adjustment reel-
stance (Fig. 146). During the bench-testing, the group shall be mounted with its terminals placed down-
wards, and an insulating sheet shall be -interposed between the fastening support and the base.
4. Connection between group terminal 31 and tractor grounding shall be well secured, otherwise the
regulation effect would fail as both the current and the shuntcoils are lacking. This case allows the
generator to increase its voltage as speed increases and windings are burned and voltage regulator
and cut-out contacts are damaged, owing to excess of current excitation of the generator.
Regulator group bench "testing.
To avoid miscalculations, the regulator group performance data must be measured by instruments
pe-rioclically calibrated and according to the prescribed rules and methods.
No removal of group seals is allowed for taking such measurements.
Checks. Gperatlons and cautions.
Test efiiciency of regulator group as follows:
a) a fest bench will be provided with a HAT Fr' H5-
740,»'24~160lJ Var. 2 or FIAT DC 115;'24j'?l3 C ge-
nerator, coupled £0 a motor whose speed may be
gradually stopped;
ta) insfallaiion should have the measuring devices
and in slrumenis, concerning the testing of cutout
relay, current and voltage regulators, according
to instructions and rules hereafter.
Cl-li~f>1lT r' 9 l<' = 1§/- 1) Closing voltage.
Wiring should be as shown in Fig. 143:
- generator speed should be gradually increased;
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