Taylor THDC-954, Руководство по обслуживанию

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6-5 6-5 THDC / THDCP - 954 / 955 / 974 (Rev. 06/03) THDC / THDCP - 954 / 955 / 974 (Rev. 06/03)
toggles between pins 87A (when de-energized) toggles between pins 87A (when de-energized)
and 87 (when ener
and 87 (when energiz gized). ed). Pins 86 and 85 of the Pins 86 and 85 of the
relay wil relay will energize the coil of the relay l energize the coil of the relay. . Pin 85, in Pin 85, in
all cases, is always the ground side and pin 86, in all cases, is always the ground side and pin 86, in
all cases
all cases, is alway , is always the hot side. s the hot side. Either sign Either signal can al can
be sent to the relay to energi be sent to the relay to energize it. ze it. Ensu Ensure that pin re that pin
85 is properly grounded, when required, and / or 85 is properly grounded, when required, and / or
that 12 VDC is present at pin 86 when it is
that 12 VDC is present at pin 86 when it is
required.
required.
When the relay is de-energized, the internal When the relay is de-energized, the internal
switch connects pins 30 and 87A completing the
switch connects pins 30 and 87A completing the
circ
circuit of the two pins. uit of the two pins. When the relay i When the relay is ener- s ener-
gized, the coil shifts the switch, connecting pins gized, the coil shifts the switch, connecting pins
30 and 87 completing the circuit of the two pins.
30 and 87 completing the circuit of the two pins.
The most effective way to troubleshoot the relay is The most effective way to troubleshoot the relay is
with an ohmmeter
with an ohmmeter. . This can be accompl This can be accomplished by ished by
removing the female spade connectors from pins removing the female spade connectors from pins
30, 87, and 87A.
30, 87, and 87A. In a In a de-en de-energi ergized stat zed state, ensur e, ensure e
that pins 30 and 87A have continuity between that pins 30 and 87A have continuity between
them.
them. With an ohmmeter With an ohmmeter, check the resis , check the resistance tance
betw between pins 30 and 87a. een pins 30 and 87a. The ohmm The ohmmeter sho eter should uld
indi indicate a readi cate a reading of 0 ng of 0 - 40 ohms. - 40 ohms. Energ Energize the ize the
relay and check the resistance between pins 30 relay and check the resistance between pins 30
and 87.
and 87. The ohmm The ohmmeter should i eter should indicate a readi ndicate a reading ng
of 0 - 40 of 0 - 40 ohms ohms. . If thes If these two chec e two checks are good, th ks are good, the e
rel relay is good. ay is good. If one of these che If one of these checks fa cks fails and 12 ils and 12
Normally Closed Normally Closed
Contact (when relay
Contact (when relay
is de-energized)
is de-energized)
Normally Open Normally Open
Contact (when relay
Contact (when relay
is de-energized)
is de-energized)
Common Common
Contact
Contact
Illus Illustration 6-4. tration 6-4. SP SP, ST 30 amp Relay , ST 30 amp Relay
VDC required at pin 86 was or was not present, or VDC required at pin 86 was or was not present, or
ground signal at pin 85 was or was not present,
ground signal at pin 85 was or was not present,
dependant on the desired state of relay (ener-
dependant on the desired state of relay (ener-
gized or de-energized), the relay is bad and must
gized or de-energized), the relay is bad and must
be replaced.
be replaced.
Single- Single-Pole, Single-Th Pole, Single-Throw 10 row 10 amp Relays amp Relays with with
L.E.D.s L.E.D.s (Illustrati (Illustration on 6-5) 6-5) .. A relay is nothing more A relay is nothing more
than an electrical than an electrically control ly controlled switc led switch. h. Relays ar Relays are e
always shown on electrical circuits in a de-ener- always shown on electrical circuits in a de-ener-
gized state.
gized state. The positi The positive side of the relay c ve side of the relay coil is oil is
pin 14 while the negative side of the coil is pin 13. pin 14 while the negative side of the coil is pin 13.
Either signal, 12 VDC or ground (or both), can be
Either signal, 12 VDC or ground (or both), can be
sent to the relay coil to energize the relay.
sent to the relay coil to energize the relay.
When the relay is de-energized, the internal When the relay is de-energized, the internal
switch connects pins 9 and 1 completing the cir-
switch connects pins 9 and 1 completing the cir-
cuit of the two pi
cuit of the two pins. ns. When the relay i When the relay is energized, s energized,
the coil shifts the switch, connecting pins 9 and 5 the coil shifts the switch, connecting pins 9 and 5
completing the circuit of the two pins.
completing the circuit of the two pins.
When the L.E.D. is illuminated, the coil of the relay When the L.E.D. is illuminated, the coil of the relay
is energiz is energized. ed. This does not indi This does not indicate that the con- cate that the con-
tact points of the internal switches are functioning tact points of the internal switches are functioning
properly
properly. . Do not rely on the L.E.D Do not rely on the L.E.D. to give the full . to give the full
operational status of the relay. operational status of the relay.
The most effective way to troubleshoot this type The most effective way to troubleshoot this type
relay is wi
relay is with an ohmmeter th an ohmmeter. . This can be accom- This can be accom-
plished by removing the wires at relay socket ter- plished by removing the wires at relay socket ter-
min
minals 9, 5, and 1. als 9, 5, and 1. In a de-ener In a de-energize gized state, en- d state, en-
sure that terminals 9 and 1 have continuity sure that terminals 9 and 1 have continuity
between them.
between them. With an ohmm With an ohmmeter eter, check the re- , check the re-
sistanc sistance between termi e between terminals 9 and 1. nals 9 and 1. The ohmme- The ohmme-
ter sho ter should indi uld indicate a readi cate a reading of 0 ng of 0 - 40 ohms. - 40 ohms. En- En-
ergize the relay and check the resistance between ergize the relay and check the resistance between
termi
terminals 9 and 5. nals 9 and 5. The ohmmeter s The ohmmeter should indicate hould indicate
a readin a reading of 0 g of 0 - 40 ohms. - 40 ohms. If thes If these two chec e two checks are ks are
good, the re good, the relay is goo lay is good. d. If one of these chec If one of these checks ks
fails and 12 VDC required at terminal 14 was or fails and 12 VDC required at terminal 14 was or
was not present, or ground signal at terminal 13
was not present, or ground signal at terminal 13
was or was not present, dependant on the desired
was or was not present, dependant on the desired
state of relay (energized or de-energized), the
state of relay (energized or de-energized), the
relay is bad and must be replaced.
relay is bad and must be replaced.
Double-Pole, Double-Throw 10 amp Relays Double-Pole, Double-Throw 10 amp Relays
with L.E.D.s
with L.E.D.s (Illustration 6-6) (Illustration 6-6) .. A relay is nothing A relay is nothing
more than an electric more than an electrically contr ally controlled swit olled switch. ch. Relays Relays
are always shown on electrical circuits in a de-en- are always shown on electrical circuits in a de-en-
ergized st
ergized state. ate. The positi The positive side of the relay c ve side of the relay coil is oil is
pin 14 while the negative side of the coil is pin 13. pin 14 while the negative side of the coil is pin 13.
Either signal, 12 VDC or ground (or both), can be
Either signal, 12 VDC or ground (or both), can be
sent to the relay coil to energize the relay.
sent to the relay coil to energize the relay.
When the relay is de-energized, the internal When the relay is de-energized, the internal
switch connects pins (9 and 1) and pins (12 and switch connects pins (9 and 1) and pins (12 and
4) completing the circuit of both sets of pins.
4) completing the circuit of both sets of pins.
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