Adjustments And Maintenance - ABB CA-26 Instruction Leaflet

For detail information on the FT case refer to IL 41-
076 for semi-flush mounting.
6.0

ADJUSTMENTS AND MAINTENANCE

The proper adjustments to insure correct operation of
this relay have been made at the factory. Upon
receipt of the relay, no customer adjustments should
be required.
6.1. Acceptance Check
The following check is recommended to insure that
the relay is in proper working order. The relay should
be connected per Figure 8.
A. Minimum Trip Current
Apply current to terminals 12 and 13 of the relay. The
relay should operate as follows:
CA-16
B. Percentage Differential Characteristic
Apply 16 amperes to terminals 9 and 19 of the CA-16
relay. The contacts should close when the following
operating current is applied to the relay with connec-
tions of Figure 8.
CA-16
Check each individual restraint winding by applying
50 amperes to each winding. Apply sufficient operat-
ing current to the operating circuit until the contacts
just close. The operating current should be:
CA-16
C. Time Curve
Apply 20 amperes to terminals 12 and 13 of the
relays. The contacts should close in the following
times:
CA-16
D. Indicating Contactor Switch (ICS)
Close the main relay contacts and pass sufficient dc
current through the trip circuit to close the contacts of
the ICS. This value of current should not be greater
than the particular ICS nameplate rating. The indica-
tor target should drop freely.
Repeat above except pass 85% of ICS nameplate
rating current. Contacts should not pickup and target
should not drop.
E. Sensitive Fault Detector
Apply current to terminals 14 and 15 of the relay. The
fault detector should operate between the limits of
0.142 to 0.158 amperes.
Courtesy of NationalSwitchgear.com
0.15 amperes ± 5%
17.0 amperes ± 7%
3.9 to 5.1 amperes
52 ± 5% Milliseconds
6.2. Routine Maintenance
All contacts should be periodically cleaned. A contact
burnisher is recommended
(S#182A836H01). The use of abrasive material for
cleaning contacts is not recommended, because of
the danger of embedding small particles in the face
of the soft silver and thus impairing the contact.
7.0 CALIBRATION
Use the following procedure for calibrating the relay if
the relay has been taken apart for repairs or the
adjustments disturbed. This procedure should not be
used until it is apparent that the relay is not in proper
working order. (See "Acceptance Check".)
7.1. Contacts
Adjust the adjustable stop screw on the upper disc of
the relay so that a contact separation of 0.050 inch is
obtained between the moving contact and the sta-
tionary contact. Lock the screw with the nut provided
for the purpose.
7.2. Minimum Trip
The relay should be level for this test. Minimum trip
current can best be determined with the permanent
magnet removed.
Adjust the spring tension until t he relay just closes its
contacts with the following current applied to termi-
nals 12 and 13 of the relay.
CA-16 0.15 amperes
7.3. Percentage Slope Characteristic
Connect the relay per the test circuit of Figure 8.
Pass 20 amperes for the CA-16 relay into terminals 9
and 19 of the relay. Adjust the plug (when used) in
the operating electromagnet until the contacts just
close with the following currents into the operating
circuit of the relays.
CA-16 29.4 to 34 amperes
7.4. Time Curve
Place the permanent magnet on the relay and apply 20
amperes to terminals 12 and 13 of the relay. Adjust the
keeper of the permanent magnet until the contacts just
close in the following times:
52 ± 5% Milliseconds
CA-16
These times should be the average of 5 readings.
7.5. Indicating Contactor Switch (ICS)
Initially adjust unit on the pedestal so that armature fin-
gers do not touch the yoke in the reset position.
41-337.31B
for this purpose.
5