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GEH-2030
+
rapped Resistor
[}~~~
- series section
- parallels high resistance
section of TX
INSTALLATION
RECEIVING
These relays when not included as a part of a control panel will be shipped in cartons designed to
protect them against damage.
Immediately upon receipt of a relay, examine it for any damage sustained
in transit.
If injury or damage resulting from rough handling is evident, file a damage claim at once
with the transportation company and promptly notify the nearest General Electric Apparatus Sales Office.
Reasonable care should be exercised in unpacking the relay in order that none of the parts are
damaged or the adjustments disturbed.
If the relays are not to be installed immediately, they should be stored in their original cartons in
a place that is free from moisture, dust and metallic chips. Foreign matter collected on the
o~tside
of
the case may find its way inside when the cover is removed and cause trouble in the operation of the relay.
LOCATION AND MOUNTING
The location should be clean and dry, free from dust and excessive vibration, and will be lighted to
facilitate inspection and testing. The relay should be mounted on a vertical surface. The outline and
panel drilling diagram for the relays covered by this instruction book is shown in Figure 16.
CONNECTIONS
The internal wiring diagrams for the various relays covered by 'these instructions are shown in
Figures 6 to 13 inclusive. Typical external connection diagrams are shown in Figures 4 and 5.
Unless mounted on a steel panel which adequately grounds the relay case, it is recommended that the
case be grounded through a mounting stud or screw which a conductor not less than #12 B
&
S gauge copper
wire or its equivalent.
It should be noted that an external means must be provided to open the rotonoid coil (TU) circuit
after any of the intermittently rated relays have operated.
SETTINGS
As shipped from the factory (unless otherwise specified) TU2 cam will be set at one second on the three
second relays and at 20 cycles on the one second relay. The TU3 contact for Doth the three and the one sec-
ond relays is set at its maximum time limit position.
In order to change the time setting of either the TU2 or the TU3 contact simply loosen the clamping
screw that holds the pOinter in position. Move the pOinter to the desired time and then tighten the
clamping screw.
MAINTENANCE
PERIODIC TESTING
It is recommended that a mechanical inspection and an operation test be performed at least annually,
and if possible at the same time associated equipment is tested.
The interval of time may vary depending on the relative importance of individual protective equipment,
their exposure to unfavorable conditions such as extreme heat, moisture or fumes. Dust and dirt may con-
taminate the relay when the protective cover t's removed.
Periodic tests consist of checking the contacts for corrosion and pitting, and the relay calibration.
6
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