Richards 137NP, Инструкция по эксплуатации, Страница: 20 / 53

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phase sequence provided four leads are interchanged in accordance with the wiring
diagram).
6. Return the phasing relay connections to normal.
7. Remove test caps B, C, and F for the following tests.
D. ETI MNPR® Microprocessor Network Protector Relays
The relay will not close its contacts on a crossed phase system. It is, also, insensitive to
phase sequence and will function accurately for protectors wired with phase sequence 1-2-3
and installed on systems wired 3-2-1.
E. Electrical Testing
When these observations have been completed the protector may be operated electrically to
check the mechanism operation. These tests should be performed using a network protector
test kit. Explicit instructions are included with these test kits. If a test kit is not available the
following method can be used.
1. Remove the electromechanical or solid state relay and insert a jumper across
terminals 1 and 2 (wire No. 6-6A) of the phasing relay plug (if provided).
a. On 120/216V units connect a 216V source to studs K and L to energize the
operating circuits. Connect the closing contact of a control switch to terminals 2
and 3 (wire No. 6-11) of the master relay plus and a tripping contact to terminals
1 and 3 (wire No. 41-11). Activate the “closing contact” of the control switch. If
the manual operating handle of the protector is in the automatic position the
protector will close.
Activate the “tripping contact” of the control switch. The protector should now
trip.
Turn the manual handle to the “open” position. Activation of the closed contact
of the control switch should not close the protector.
b. On 277/480V units connect a 480V source to studs 11 and 21 for trip circuit test,
and studs 11 and 3A for motor and motor control circuit tests. Repeat test a.
above.
If the mechanism over travels, and goes through a trip-free operation before closing, remove
the motor and clean torque brake. If the breaker has been turned upside down or front side
down, oil from the gearbox may run into the torque brake making it ineffective.