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ABB Distribution Protection Unit 1500R
9/99
Programmable Master Trip Contact
The DPU1500R contains a "master trip" contact. This output contact is factory set as a type 'A' (normally open) contact
and is actuated by the protective elements; 51P (3I>), 51N (IN>), 50P-1 (3I>>1), 50P-2 (3I>>2), 50P-3 (3I>>3), 50N-1
(IN>>1), 50N-2 (IN>>2), 50N-3 (IN>>3), and 46 (Insc>). It is possible to set this contact to a B type (normally closed) by
removing the DPU1500R from its case and changing jumper J6. It is necessary to remove the metal RF shield covering
the output relays. This is done by removing the two phillips screws holding the metal shield in place. Place jumper J6
in "NO" for a normally open contact and "NC" for a normally closed contact.
It is also possible to eliminate any of the above listed protective elements from activating the master trip contact. This
can only be performed by the WinECP Select "Master Trip Contact" from "Settings" Menu and place an "X" next to the
elements desired to operate the master trip contact and a space next to those not desired. Select "Send Settings" to
complete the operation. Figure 6-3 shows a screen capture of the master trip programming.
These settings are useful where certain elements will be programmed to a different output contact (see Programmable
I/O Section) for operation of a lockout relay or other auxiliary device.
Figure 6-2. Master Trip Contact Programming Screen
Master Trip Contact Dropout
When the DPU1500R master trip contact operates due to the operation of a protective element such as 51P (3I>),
50P-1 (3I>>1), 50N-1 (IN>>1), etc., the master trip contact will drop out when the fault current on all phases drops to
90% of the lowest set time overcurrent element pickup AND the 52A (XO) and 52B (XI) breaker auxiliary contacts have
changed state to the open position. The master trip contact will stay sealed in indefinitely until these cases are met.
website:www.abb.com/papd
Programmable Input and Output Contacts
6-12
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