Table of Contents
Advertisement
41-579.11B
4.0
RELAY SETTINGS
4.1
TIME DELAY
Time delay is selected by adjusting rheostat T.
For Zone 2 distance applications, the timer setting
should be sufficient to allow relays and breakers beyond
the next bus to clear the fault. The time should be set
to allow successful breaker failure clearing. This usually
requires a setting of approximately 0.25 seconds. Zone
3 timing must coordinate with remote Zone 2 timing. A
typical setting is 0.5 seconds. Breaker failure timing is
set to assure normal fault clearing and fault detector
reset plus 2 to 3 cycles margin. Settings of 0.1 to 0.2
second are typical.
4.2
VOLTAGE RATING (RESISTOR - RS)
The correct tap on resistor RS should be selected for
the supply voltage being used, per the appropriate internal
schematic (see Figures 5 to 6). Note that terminal 1 of
the RS resistor has a red dot for ease of identification.
•
48/125 VDC relays are preset from the factory at
125 Volts.
•
24/32 VDC relays are preset from the factory at 32
volts.
•
No adjustments are necessary for 250 VDC relays.
4.3
TX RELAY
When the TX relay is used, the correct resistance in
series with the coil of the TX relay has to be selected for
the supply voltage being used.
To use the relay with a supply voltage of 48 or 24 VDC,
move jumper JP1 on Printed Circuit Board to Position
1. This will jumper resistor R1, see Figures 2 and 6.
10
Type TD-5 Class 1E Time Delay Relay
4.4
INDICATING CONTACTOR SWITCH (ICS)
No setting is required on the ICS.
5.0 INSTALLATION
The relays should be mounted on switchboard panels
or their equivalent in a location free from dirt, moisture,
excessive vibration, and heat. For semi-flush mounting,
install the relay vertically by means of the four mounting
holes on the case flange. The mounting screws may
also be utilized for grounding the relay. External toothed
washers are provided for use in the locations shown on
the outline and drilling plan (Fig. 7) to facilitate making a
good electrical connection between the relay case, the
mounting screws, and the relay panel. Ground Wires
should be affixed to the mounting screws as required for
poorly grounded or insulated panels. The electrical
connections are made directly to the relay terminals by
means of screws (also provided).
For detail information on the FT case refer to Instruction
leaflet 41-076 for semi-flush mounting.
6.0 ADJUSTMENTS AND MAINTENANCE
Note: The proper adjustments to insure correct
operation of this relay have been made at the
factory and should not be disturbed after receipt
by the customer. In particular, do not remove knob
from rheostat shaft and do not loosen the
potentiometer lock nut or adjustable resistor clamp.
Upon receipt of the relay, no customer adjustment,
other than those covered under relay settings
should be required.
6.1
ACCEPTANCE CHECK
The following check is recommended to insure that the
relay is in proper working order. Perform a timing check
at minimum and maximum settings. A recommended
test circuit is shown in Figure 4. When testing the TD-
5 with a TX relay make the dotted connection as shown
Advertisement
Table of Contents
