ABB TD-5 Instruction Leaflet page 12

41-579.11B
Measure between anode of D3 and adjustable
terminal of P.
7.0 CALIBRATION
Use the following procedure for calibrating the relay if
the relay has been taken apart, or the adjustments have
been disturbed. This procedure should not be used
until it is apparent that the relay is not in proper working
order. (See Acceptance Check, Section 6.1). Before
calibrating, follow the Trouble Shooting Procedure,
Section 6.3, to locate the source of trouble.
7.1 TR, TX RELAY ADJUSTMENT
No adjustments are necessary.
7.2 RHEOSTAT KNOB ADJUSTMENT (SAME
SCALE)
If it is necessary to replace the rheostat (T) or the silicon
power regulator (Z or Z1), in most cases the relay may
be recalibrated with the same scale plate.
This is done by rotating the rheostat shaft, without knob,
until a time delay equal to the minimum scale marking
is obtained. Then, align the knob for this delay and
tighten the knob set screw securely. Pause several
seconds between readings for all delays above .05
seconds. See section 3.4 Accuracy for discussion of
this.
12
Type TD-5 Class 1E Time Delay Relay
7.3 SCALE PLATE CALIBRATION (NEW SCALE)
If it is necessary to replace the potentiometer P or the
Printed Circuit Board, the relay should be recalibrated
with a new scale plate. Use the following procedure:
1. With the knob off the shaft, set the rheostat (T)
at maximum.
2. Adjust P so that the times are 5% to 10% longer
than the maximum scale marking.
3. Set the rheostat T at minimum and check that
times are less than or equal to the minimum
scale marking. If not, adjust P slightly to reduce
times. Tighten locknut or adjustable terminal
on P.
4. Place the knob on the rheostat shaft in such a
position that the times are symmetrical with
respect to the scale plate marking. Tighten the
knob setscrew and mark calibration lines on
the scale plate. When striking calibration lines
for delays above 0.5 seconds, pause at least 3
seconds between readings. See Section 3.4
7.4 INDICATING CONTRACTOR SWITCH (ICS)
Initially adjust ICS unit on the pedestal so that armature
fingers do not touch the yoke in the rest position, (viewed
from top of swtich between cover and frame). This can
be done by loosening the mounting screw in the molded
pedestal and moving the ICS in the downward position.
Contact Wipe - Adjust the stationary contacts so that
both stationary contacts make with the moving contacts
simultaneously and wipe is 1/64" to 3/64" when the
armature is against the core.
Target - Manually raise the moving contacts and check
to see that the target drops at the same time as the
contacts make or up to 1/16" ahead. The cover may be
removed and the tab holding the target reformed slightly