Telma

Question 1

Telma retarder. 95 and 96 Simon Lti Aerial Aruck.
2000 and 2001 American LaFrance.
- Attached to the rear axle of apparatus.
- The drive shaft is cut, balance and attached to two rotors that rest near the retarder with a very narrow clearance.
- Electromagnets with alternate polarities located in the stator.
- As current clows through the stator coils, a magnetic field is created which passes through the rotors.
- The magnetic field creates eddy currents in the rotors, whcih oppose rotor rotation and slow the driveline.
- The resuklt is a driveline retarding effort to the drive wheels.

Answer 1

Reference

Question 2

95&96 LTI and 2000 & 2001 telma.
Telma uses.
- descending grades
- driving in city traffic
- whenever vehicle retarding is required.

Answer 2

Reference

Question 3

Telma retarder controls consist of the following.
On/off switch.
- Low speed switch which deactivates the retarder when the vehicle speed is below 2-3 MPH.
- Five position handle on the steering column
- four lights, one for each stage activated

Answer 3

Reference

Question 4

Telma operation. 
 The following four positions is based on pressures applied to the brake pedal and the activation from each popsition:
- 3 PSI- \_\_\_% effect
- 5 PSI - \_\_\_% effect 
- 7 PSI - \_\_\_% effect
- 10 PSI- \_\_\_% effect

Answer 4

25%
50%
75%
100%

Question 5

Maintain telma in position 2 after stabilizing the vehicle at desired speed.

Answer 5

Reference

Question 6

Electrical draw of telma.

Since the telma operates by the use of electromagnets, there is an increased draw on the electrical system.
Each stage draws approximately ___-___ amps.
When all four stages are activated, the telma draws approximately ___ amps.
With these factors in mind, operators should pay greater attention to the apparatus charging system.
If the voltmeter drops below set standards, turn off the telma toggle switch and consult the shops.

Answer 6

50 - 60 amps

250 amps