APC PDPM138H-R Installation Guide download pdf (Page 23)

Maintenance: Parts Replacement

990-3054B-001 Modular Power Distribution Unit – Operation 17

How to install a Power Distribution Module

Electrical Hazard: To prevent arcing when removing an APC Power Distribution Module

(PDM) from the Modular Power Distribution Unit (PDU), set all PDMs to

OFF. Do not

remove the modules when they are under load.

Caution: PDMs must be replaced by trained personnel only (see the section "Safety").

Note: The PDM can be safely installed into a powered rack.

Note: For PDMs with RCDs installed, the occurrence of an earth fault will automatically open

the adjacent circuit-breaker. (See the below drawing under "PDMs with RCDs").

Note: PDMs with RCDs are equipped with a test button. Periodic testing of the RCD may be

required. Check your local codes for your region. (See the section "Note: Do not throw away

the filler plate. Keep it for potential later use.").

position

PDM – Single and Three

phase

PDM with RCD (Residual Current

Devices) - Three phase

PDM with RCD – Single phase

position





PDMs with RCDs

 An earth fault will open the

adjacent circuit breaker to the

OFF

position. The fault is indicated by a

red strip on the RCD toggle.

 The circuit breaker has been closed

manually by pushing the toggle to the

ON position.

Test

button

Test

button

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APC PDPM138H-R Installation Guide Page 23