| Customization: | Available |
|---|---|
| Application: | Power |
| Phase: | Three |
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Motor drive unit CMA7 is used for driving tap changer to realize tap change operation.
All necessary electrical and mechanical equipments are contained in housing of motor drive unit CMA7 which
adopts step-by-step principle, namely, operate tap changer from its service position to the adjacent one. The
motor drive unit is initiated by a single control signal and it will stop automatically as one tap change operation
accomplishes.
End positions are prevented to be overrun by electrical and mechanical limits devices. The motor drive unit is
designed to have different ratings of power and current for driving various tap changers.
The whole motor drive unit is fixed outside of transformer wall and is connected to tap changer by vertical and
horizontal shaft, intermediate bevel gear box.
1.1 Scope of application
CMA7 can be used to drive CM or CV type on-load tap changer as well as off-circuit tap changer.
1.2 Service condition
The altitude can not exceed 2000 m, higher level to be specified.
Ambient temperature can not be more than 55 and less than -25.
The deviation of perpendicularity to ground can not exceed 5%.
The place for application should be free of serious dust, explosive and corrosive gases.
Maintenance
Because the transmission gear is a maintenance-free poly-V belt drive and ball bearings of motor are
sufficiently supplied with grease, a regular maintenance is not necessary. It is recommended to inspect following
items regularly:
1.Waterproof property of housing
2.Performance of resistance heater (heater and thermostat)
When tap changer is maintained, besides inspections for motor drive unit, others inspections regulated in 6.1
also should be carried out.
NOTE!
1) The number of operation position should correspond to that of on-load tap changer.
2) The auxiliary contacts of motor drive unit, motor protective switch are excluded from power
frequency withstand voltage test.
Driving mechanism
| 1. | Pre sale service |
| a. | make technical solution |
| b. | send quotation, technical data sheet and drawing |
| c. | prepare power transmission plan, testing plan and shipment plan |
| 2. | In sale service |
| a. | supervise the manufacturing schedule totally in accordance with the plan |
| b. | send photos to customer during every manufacturing process(hold point) |
| c. | inform the customer one week before testing. |
| 3. | After sale service |
| a. | installation and commissioning, training the workers |
| b. | quick response within 12 hours any time |
| c. | provide 12 months guarantee period normally. |
| 1. Q: | What is your delivery time ? |
| A: | Depend on the type of transformer. |
| 2. Q: | What is your payment term? |
| A: | 30% advance by T/T , 70% before delivery by T/T or L/C or we can discuss about it. |
| 3. Q: | What kind of standard you follow? |
| A: | IEC, ANSI, CSA, GB, etc |
| 4. Q: | What kind of supporting documentation you can provide normally |
| A: | Quotation, outline drawing, manufacturing plan, quality control plan testing plan, financial report, type test report(KEMA, CESI),reference list, etc |
| 5. Q: | What is your normal warranty period? |
| A: | 12 months after transformer operation. |
| 6. Q: | Can u do installation and commission in user's site? |
| A: | Yes, we can send our installation team to user's country for service. |
| 7. Q: | Do you have any experience in this kind of transformer? |
| A: | Yes, we can provide reference list for check. |
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