Advertisement
From relay terminal 6 to S
volts.
From relay terminal 6 to R
Repeat the same measurements for S
R
, R
leads.
B
C
3. Disconnect R
lead from M
0
sure the voltage from relay terminal "4" to the R
lead. It should be below 0.7 volts ac.
4. Apply rated dc voltage to the relay. Check the dc
voltage across the lower set of plug-in terminals
(rear view) "5" and "1" for the SDG-1T, -2T, and -
4T relays. It should measure 20 (±2) volts.
Note:
250 V dc relay requires external resistor.
5. Plug in the lower and upper boards.
Part C Potentiometer Adjustments
!
CAUTION
All potentiometers are locked type and
should be unlocked before adjustment
and locked after adjustment is complete.
1. Set R5, R6, R7, R8 for maximum setting (coun-
terclockwise).
2. If no scope is available, measure the voltages
with a Rectox-type voltmeter across the specified
terminals of the small upper terminal board
located in the rear. All the following measure-
ments are done on the small upper board. Termi-
nal numbers refer to this board only. Use of
scope is preferred.
R5 Adjustment
Measure the voltage across terminals 2 and 3. Adjust
R5 until voltages across 4 and 2 and 4 and 3 are
equal (±0.1 volt) to each other and are within 1.0 volt
of voltage across 2 and 3. If oscilloscope is available,
observe voltage across R9 and set R5 so that peaks
on the 360 Hz ripple are in ascending order.
R6 Adjustment
Measure the voltage across terminals 6 and 8. Adjust
R6 until voltages across terminals 7 and 6 and 7 and
= 3 Tap 210 (±3)
A
lead 39.2 (±5) volts.
A
, S
, and
B
C
= 0 Tap and mea-
O
0
8 are equal (±.1 volt) to each other and are within 1.0
volt of voltage across 6 and 8. If an oscilloscope is
available observe voltage across R10 and set R6 so
that peaks are in ascending order.
R7 Adjustment
Measure the voltage across terminals 17 and 18.
Adjust R7 until voltages across terminals 15 and 18
and 15 and 17 are equal (±0.1 volt) to each other and
are within 1.0 volt of voltages across 17 and 18. If
oscilloscope is available observe voltage across R11
and set R7 so that peaks are in ascending order.
R8 Adjustment
Reduce V
to zero and measure the voltage across
AN
terminals 11 and 12. Adjust R8 until voltages across
terminals 14 and 11 and 14 and 12 are equal ( 0.1
volt) to each other and are within 1.0 volt of voltage
across 11 and 12. If oscilloscope is available observe
voltage across R12 and set R8 so that the two val-
leys in the middle are equal.
Maximum Torque Angle Adjustment
Disconnect all R and L leads and jumper relay termi-
nals 5 and 6.
R1 Adjustment
For the 1.0 - 31.0 ohm relay use the No. 1 test con-
nection of Figure 9. Apply 5.08 amp ac current to the
relay. Set V
45 volts and V
AN
the phase-shifter for 75° current lagging voltage.
For .20 - 4.35 ohm relay use the same procedure as
above except set the current for 15.65 amp. and V
= 20 volts.
Insert an ac voltmeter of 0.3 volts range between R
and L
leads. Adjust R1 potentiometer for a minimum
A
("null" reading) and lock R1 in place. Vary current
slightly to achieve lower "null" reading.
For other angles multiple current by:
K
=
where θ = desired maximum torque angle, for θ =
60° K = 1.11.
I.L. 41-496.52D
= V
= 0 volts. Set
BN
CN
Sin 75
----------------- -
Sin θ
AN
A
19
Advertisement
