Test Points 6-3
Power Stage Interface/
Switcher Board
Table 6.B Series B Drives Rated 1-30 HP, 230V AC & 2-60 HP, 460V AC.
53 0V DC when measured with respect to
TE signal ground.
Isolated Ground. All isolated signals must be
measured with respect to TP53.
54 +12 (11.85 / 13.13)V DC when
measured with respect to TP53.
Isolated +12V DC analog voltage supply
55 +12 (11.85 / 13.13)V DC when
measured with respect to TP57.
+12V DC analog voltage supply.
56 –12 (–11.85 / –13.13)V DC when
measured with respect to TP57.
+12V DC analog voltage supply.
57 0V DC when measured with respect to
TE.
–12V DC analog voltage supply.
58 +5, +0.02V DC measured with respect
to TP53.
Analog Ground. All signals must be measured with
respect to TP57. Isolated +5V DC supply voltage.
Test
Point Normal Value Description
Test
Point Normal Value Signal Description
1 12V DC (11.85/13.13) 12V DC Power Supply
2 +5V DC when field firing is enabled FFIREEN signal from Main Control Board
3 0V DC Not Used
4 +12, (+11.85/13.13)V DC +12V DC Power Supply
5 +24, ±6.0V DC +24V DC Power Supply
6 +5V DC when armature firing is
enabled
AFIREEN signal from Main Control Board
7
Test points TP7-TP20 are used to
monitor the gate pulses to the
armature and field SCRs. The
observed signal for these test points
will be a square wave, +24V to 0V DC,
120 degrees On & 240 degrees Off
when the particular SCR is being fired.
Bridge Armature; SCR 1F
8 Bridge Armature; SCR 5F
9 Bridge Armature; SCR 3F
10 Bridge Armature; SCR 4R
11 Bridge Armature; SCR 2R
12 Bridge Armature; SCR 6R
13 Field; FLD1
14 Armature; 2F
15 Field; FLD2
16 Armature; 4F
17 Armature; 5R
18 Armature; 6F
19 Armature; 1R
20 Armature; 3R
21 0V DC when Relay K3 is energized Control Signal to K3
22 +5, (±0.02V DC) +5V DC power supply
23 +0, +0V DC Control common (TE signal ground)
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