Contents: Checking functionality ↓ Full braking test ↓ Idle speed test ↓ Checking the traction relay ↓ Starter relay ↓
If there are any doubts about the efficiency of the starter, it is necessary to check it on the stand.
The electrical circuit diagram for testing the starter on the stand is shown in Fig. 7-15. The connecting wires to the current source, ammeter and contact bolt of the starter traction relay must have a cross-section of at least 16 mm².
Fig. 7-15. Connection diagram for testing the starter on the stand:
1 - voltmeter with a scale limit of at least 15 V; 2 - starter; 3 - rheostat 800 A; 4 - ammeter with 1000 A shunt; 5 - switch; 6 - battery/
The starter temperature during testing should be (25±5)°C, and the brushes should be well ground to the commutator.
Checking functionality
By closing switch 5 (Fig. 7-15), with a current source voltage of 12 V, turn on the starter three times with different braking conditions. For example, with braking torques of 2; 6 and 10 Nm (0.2; 0.6 and 1 kgf·m). The duration of each starter activation should be no more than 5 s, and the intervals between activations should be no less than 5 s.
If the starter does not rotate the stand's ring gear or its operation is accompanied by abnormal noise, then disassemble the starter and check its parts.
Full braking test
Brake the stand's toothed ring gear, turn on the starter and measure the current, voltage and braking torque, which should be no more than 550 A, no more than 7.5 V and no less than 13.7 N·m (1.4 kgf·m), respectively. The starter engagement time should be no more than 5 s.
If the braking torque is lower and the current is higher than the specified values, then the reason for this may be an interturn short circuit in the stator and armature winding or a short circuit of the windings to ground.
If the braking torque and current consumption are lower than the values specified above, the cause may be oxidation and contamination of the commutator, severe wear of the brushes or a decrease in the elasticity of their springs, brushes hanging in the brush holders, loosening of the stator winding terminals, oxidation or burning of the contact bolts of the traction relay.
When fully braking, the starter anchor should not turn; if this happens, the freewheel clutch is faulty.
To troubleshoot, disassemble the starter and replace or repair damaged parts.
(The text is on the website: «VAZbook»)
Idle speed test
Disengage the stand's toothed ring gear from the starter pinion. Turn on the starter and measure its consumed current and the starter anchor rotation speed, which should be no more than 60 A and (5000±1000) min⁻¹, respectively, at a voltage of 11.5-12 V at the starter terminals.
If the current strength and the rotation speed of the armature shaft differ from the specified values, then the reasons may be the same as in the previous test.
Checking the traction relay
Install between the limiting ring 21 (fig. 7-13) and a 12.8 mm thick gasket with a gear and turn on the relay. The relay turn-on voltage when the gear rests on the gasket should not exceed 9 V at an ambient temperature of (20±5)°C. If the voltage is higher, this indicates a faulty relay or drive.
Starter relay
The relay turn-on voltage should be no more than 8 V at a temperature of (23±5)°C. If the voltage is higher, this indicates a relay or drive malfunction.