© Edwards Limited 2007. All rights reserved.
Page 35
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A301-51-880 Issue T
Figure 15 - Electrical supply configuration C
Figure 16 - Electrical supply configuration D
Note:
The thermistor terminals may
be annotated "T1" and "T2"
instead of "P1" and "P2".
1. Thermistors cable
2. Cable-gland
3. Links
4. Terminal/wire markings
5. Cable-gland
6. Electrical supply cable
7. To control circuit
1. Thermistors cable
2. Cable-gland
3. Links
4. Terminal/wire markings
5. Cable-gland
Note:
The thermistor terminals may
be annotated "T1" and "T2"
instead of "P1" and "P2".
6. Electrical supply cable
7. To control circuit
A301-51-880 Issue T
Page 36
© Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
In
st
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Figure 17 - Electrical supply configuration E
Figure 18 - Electrical supply configuration F
1. Thermistors cable
2. Cable-gland
3. Terminal/wire markings
4. Cable-gland
5. Electrical supply cable
6. To control circuit
Note:
The thermistor terminals may
be annotated "T1" and "T2"
instead of "P1" and "P2".
Winding wires may be
numbered without letters.
1. Thermistors cable
2. Cable-gland
3. Links
4. Terminal/wire markings
5. Cable-gland
6. Electrical supply cable
7. To control circuit
Note:
The thermistor terminals may
be annotated "T1" and "T2"
instead of "P1" and "P2".
Winding wires may be
numbered without letters.
© Edwards Limited 2007. All rights reserved.
Page 37
Edwards and the Edwards logo are trademarks of Edwards Limited.
In
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A301-51-880 Issue T
Figure 19 - Electrical supply configuration G
Figure 20 - Electrical supply configuration H
1. Thermistors cable
2. Cable-gland
3. Terminal/wire markings
4. Cable-gland
5. Electrical supply cable
6. To control circuit
1. Thermistors cable
2. Cable-gland
3. Links
4. Terminal/wire markings
5. Cable-gland
6. Electrical supply cable
7. To control circuit
Note:
The thermistor terminals may
be annotated "T1" and "T2"
instead of "P1" and "P2".
A301-51-880 Issue T
Page 38
© Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
In
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Figure 21 - Electrical supply configuration I
3.7
Check the direction of pump rotation
It is possible for the three-phase electrical supply to the motor to be phased incorrectly. If the supply is phased
incorrectly, the rotors will rotate in the reverse direction or remain stationary. Check the direction of rotation as
described below.
1. Check that the EH pump is connected to the vacuum system or that the inlet is blanked off.
2. Connect the backing pump and switch the backing pump on.
3. On all of the EH2600 and EH4200 model pumps, the correct direction of rotation is indicated by an arrow on the
motor fan cover (
Figure 2
, item 17). To determine the direction of rotation: watch the motor fan inside the fan
cover, switch on the EH pump for two or three seconds, then switch the EH pump off.
On all of the EH250, EH500 and EH1200 model pumps, you can use the method above to determine the direction
of rotation. Alternatively, the direction of rotation is also indicated by an arrow next to the direction of rotation
sight-glass (
Figure 1
, item 10 and
Figure 2
, item 14): watch the motor-coupling in the sight-glass (
Figure 11
,
item 7), switch on the EH pump for two or three seconds, then switch the EH pump off.
4. Check that the direction of rotation of the coupling noted in Step 3 was the same as that indicated by the
rotation arrow on the motor or on the direction of rotation sight-glass. If the direction of rotation was correct,
continue at
Section 3.8
.
WARNING
Blank the inlet or connect the EH pump to the vacuum system before you check the direction of
pump rotation. If you do not, there is danger of objects being trapped in the rotating rotors.
1. Thermistors cable
2. Cable-gland
3. Links
4. Terminal/wire markings
5. Cable-gland
6. Electrical supply cable
7. To control circuit
Note:
The thermistor terminals may
be annotated "T1" and "T2"
instead of "P1" and "P2".