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6.1.4.
Squelch Unit (SQ)
Apply rated dc voltage to relay terminals that will
energize the squelch unit and note contact operation.
6.1.5.
Blocking Zener Diode
Apply rated dc voltage in series with 10,000 ohm
resistors across terminals 8 and 9 with positive on 9,
the current leakage flow should not exceed .25 mA.
Reserve polarity of the applied voltage; the current
flow should be equal to the applied voltage divided
by the series resistance.
6.2. FOR RELAYS TO BE USED WITH
TC-TYPE CARRIER
6.2.1.
Receiver Unit
Connect a jumper between the middle and left-hand
contact connection of the CSG or CSP switch. The
CSG switch is located on the left-hand pedestal and
CSP is located on the right-hand pedestal on the
relay (front view). Apply rated voltage across the
RRT coil and the RRT coil resistor, observing polarity
as shown in the internal schematic. The armature
should move to the left.
To the holding coil (RRH) relay terminals, apply direct
current observing polarity. Increase the current until
the armature moves to the right.
The armature should move to the right at approxi-
mately 60 mA. Now reduce the current and the arma-
ture should move to the left at approximately 40 mA.
6.2.2.
Alarm Unit (AL)
Connect direct current to the alarm unit relay termi-
nals. Increase the current until the contacts pick-up.
The contacts should pick up at approximately 80 mA.
Now reduce the current and the contacts should
open at 40 to 60 mA.
6.3. FOR RELAYS TO BE USED WITH
TYPE KR CARRIER OR TA-3 TONES
6.3.1.
Receiver Unit
Connect a jumper between the middle and left-hand
contact connection of the CSG or CSP switch.
CSG switch is located on the left-hand pedestal and
CSP is located on the right-hand pedestal on the
relay (front view). Apply rated voltage across the
RRT coil and the RRT coil resistor, observing polarity
as shown in the internal schematic. The armature
should move to the left.
To the holding coil (RRH) relay terminals, apply direct
current observing correct polarity. Increase the cur-
rent until the armature moves to the right. The arma-
ture should move to the right at approximately 6 mA.
Now reduce the current and the armature should
move to the left at approximately 4 mA.
6.3.2.
Alarm Unit (AL)
Connect direct current to the alarm unit relay termi-
nals. Increase the current until the contacts pickup.
The contacts should pickup at approximately 8 mA.
Now reduce the current and the contacts should
open at 4 to 6 mA.
7.0 ROUTINE MAINTENANCE
All relays should be inspected periodically and the
operation should be checked at least once every
year or at such other time intervals as may be dic-
tated by experience to be suitable to the particular
application.
All contacts should be periodically cleaned. A contact
burnisher Style # 182A836H01 is recommended for
this purpose. The use of abrasive material for clean-
ing contacts is not recommended, because of the
danger of embedding small particles in the face of
the soft silver and thus impairing the contact.
7.1. CALIBRATION
Use the following procedure for calibrating the relay if
the relay has been taken apart for repairs or the
adjustments have been disturbed. This procedure
should not be used unless it is apparent that the relay
is not in proper working order. (See "Acceptance
Check").
7.1.1.
Overcurrent Unit
The upper bearing screw should be screwed down
until there is approximately 1/64" clearance between
it and the top of the shaft bearing. Securely lock in
position with the lock nut. The lower bearing position
is fixed and cannot be adjusted.
41-923.4M
7
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