Pulsar TCF-10B, System Manual, Page: 108 / 249

JU3 This link allows selection between
1 W (Guard)/10 W (Trip) or 10 W
(Guard)/10 W(Trip) operation by
placing link in 1/10 W or 10/10 W
position, respectively.
JU4 Selecting the 2-frequency (2F)
position will set the Keying Module in
mode to correctly operate as a 2-
frequency system. Selecting the
3-frequency position will set the
Keying Module in mode to correctly
operate as a 3-frequency system.
JU6 Placing JU6 to IN position activates
the shift high contact; the OUT
position deactivates the shift high
contact.*
JU7 Placing JU7 to IN position activates
shift low contact; OUT position deac-
tivates shift low contact.*
JU8 Places shift high contacts in either
normally open (NO) position or
normally closed (NC) position.
JU9 Places shift low contacts in either
normally open (NO) position or
normally closed (NC) position.
JU10–
JU14 Provides input keying voltage selec-
tions: 15 V, 48 V, 125 V, 250 V.
10.2.3 Testing
You can also initiate a high-level test by pressing
the (recessed) push-button switch (S1) on the
front panel. You can also initiate a shift high test
by pressing the (recessed) push-button switch (S2)
on the front panel. You can also initiate a shift low
test by pressing the (recessed) push-button switch
(S3) on the front panel.
10.2.4 Voltage Regulation
Zener diodes D10, D12, D14, D16, and D18 limit
the input voltage to the optical isolators (I5, I6, I7,
I8, and I9, respectively) and also provide reverse
voltage protection. Zener diodes D6 and D7
regulate primary power (pins A-2/4, A-30/32,
C-30/32) down to 15 V, and also provide reverse
voltage protection.
10.3 Keying Troubleshooting
Should a fault occur in the Keying Module, place
the module on an extender board.
You may test the five optical isolators (I5 through
I9) using the on-board +18.6-Vdc source (D6
cathode). When a logic “1” is applied to any of the
15 V inputs (R43, R46, R40, R34, R37), with the
jumper removed, pin 5 of the selected optical
isolator (I5, I6, I7, I8 or I9) will go high.
You can check other components on the PC Board
by conventional means.
When the appropriate jumper is in place on the
board, jumpers JU10, JU11, JU12, JU13, and
JU14 provide logic “1” or “0” inputs. Logic “1” is
+18.6 Vdc; logic “0” is +8.6 Vdc. See Table 10-2,
Truth Tables for TCF–10B Keying Modules,
which describes the operation of the logic blocks
used. Proper voltage levels of these input
commands must be observed.
January 1996 Page 10–3
Chapter 10. Keying Module
10
!
CAUTION
DO NOT ATTEMPT TO FORCE A LOGIC “1”
(+18.6 VDC) ON ANY OUTPUTS OR INPUTS
CONNECTED TO OUTPUTS. THIS COULD
DAMAGE AN IC. SEE FIGURE 10-3 FOR
INTERNAL LOGIC.
*Place in the “OUT” position when using with the
Phase Comparison relay systems.