Electrical Safety Testing; Electrical Safety Checks; Earth/Ground Continuity Test - Arjohuntleigh FLOWTRON UNIVERSAL Service Manual

Testing
10

Electrical Safety Testing

To test and calibrate the pump unit correctly, the test equipment in Table 5 is required.
Item
1 Insulation Resistance Tester (Megger), 500 Vdc
2 Portable Appliance Tester
3 Multimeter / Continuity Tester
4 Test Probe, Minimum Length 100 mm, Maximum Diameter 2 mm (approximate dims.)

Electrical Safety Checks

There are several electrical safety checks that must be carried out after breakdown repairs and servicing.
Where alternatives are given, the test will depend upon the available test equipment. The tests are as
follows:
•

Earth/Ground Continuity Test

• Insulation Resistance Test (Megger Test), or
• Earth/Ground Leakage Current Test (USA)
Earth/Ground Continuity Test
This test checks the earth/ground wire continuity between the earth pin on the mains/power plug and the
earth terminal on the PSU PCB.
On the Flowtron Universal, the earth/ground wire is connected to a special earth/ground test pad on the
PSU PCB assembly (Refer to Figure 31). A voltage is established between this earth/ground test pad
and the earth/ground pin of the pump's mains/power cordset, and the resistance is checked.
To access this earth/ground test pad, there is an earth/ground access point (a small hole, approximately
3 mm diameter) underneath the case IEC cover on the rear case of the pump (Refer to Figure 30). The
earth/ground test pad itself is approximately 90 mm below this access point, on the corner of the control
PCB assembly. Therefore the test probe needs to have the following approximate dimensions:
• Minimum Length = 100 mm.
• Maximum Diameter = 2 mm.
This long test probe (Table 5, Item 5) must be inserted carefully to make sure that it makes contact with
the earth/ground test pad, and does not miss the control PCB assembly completely (Refer to Figure 30).
Test Procedure
WARNING: BEFORE REMOVING THE CASE IEC COVER, MAKE SURE THE PUMP UNIT
HAS BEEN ISOLATED FROM THE MAINS/POWER SUPPLY BY REMOVING
THE MAINS/POWER PLUG FROM THE WALL SOCKET.
Note: Refer to Figures 30 and 31 to carry out this procedure.
10.1 Remove the case IEC cover from the rear case of the pump (Chapter 5, Page 6, Section 3).
10.2 Make sure the mains/power cordset connector is pushed fully into the IEC connector on the
control PCB assembly inside the pump.
10.3 Insert the long test probe (Table 5, Item 5) through the earth/ground access point in the rear
case, and down onto the earth/ground test pad on the control PCB assembly.
Note: This is made easier if the pump is horizontal, and the probe is inserted vertically.
Chap 4
Page 14
Table 5 - Electrical Test Equipment
Test Equipment
SER0009
Flowtron Universal Service Manual
Issue 2
Sep 2009