Electro-Hydraulic Point Machines

Question 1

What is underneath the lid of an EHPM?

Answer 1

Instructions are sometimes displayed underneath the lid

•Power/Manual switch
• RED directional control lever
• Pump handle socket with Pump handle

Question 2

The power and manual switch has 2 positions, what are they and what do they do?

Answer 2

POWER- allows remote operation of points
Manual- Hold all fixed signals controlling movement on those points to danger and allows manual operation

Question 3

What are the 3 positions of a directional control lever?

Answer 3

• Normal
• Centre
• Reverse

The lever must be held in position when operating pump handle

Question 4

What is the purpose of the Pump handle?

Answer 4

To pump to points until they are locked in the required N or R position

Question 5

What is the location of the driver operated EHPM?

Answer 5

Cranbourne sidings

Question 6

What are the steps to operate a EHPM?

Answer 6

1. Open the lid by unlocking the padlock and read instructions
2. Move POWER/MANUAL switch to MANUAL
3. Move the directional control lever to required position and hold
4. Pull or insert pump handle into socket
5. Pump until points are fully home and locked

Question 7

What are the steps after operating the EHPM?

Answer 7

1. Move pump handle to the vertical position and retract or remove
2. Leave POWER/MANUAL switch in MANUAL
3. Close lid and lock with padlock
4. Apply locking bar

Question 8

Can you switch the POWER/MANUAL Switch to POWER?

Answer 8

NO only a maintenance technician can