4-9
Controller Troubleshooting
TP-5672 11/95
For location of pushbuttons, switches, LEDs, and keys
referred to in this section, see Figure 2-1.
This section covers the condition in which the emergency
source is available but the Source-Available, Emergency
LED is not on.
The first item to check is the trip-point settings. The
trip-point settings can be found in Index 7 in the program
menu. The recommended trip-point settings are in
Figure 4-6. If the trip points in Index 7 are too high or too
low, change them. Enter emergency source voltage and
emergency source frequency. Store the set points.
Trip Point
Setting Limits
Emergency
Source Factory
Setting
Overvoltage
Dropout
105% -- 135%
115%
Overvoltage
Pickup
100% -- 130%
110%
Undervoltage
Pickup
75% -- 100%
90%
Undervoltage
Dropout
70% -- 95%
85%
Overfrequency
Dropout
105% -- 135%
115%
Overfrequency
Pickup
100% -- 130%
110%
Underfrequency
Pickup
85% -- 100%
90%
Underfrequency
Dropout
80% -- 95%
85%
Figure 4-6. Emergency source voltage trip point
Setting Limits And Factory Settings
Next check Index 2 of the program menu for correct
emergency source voltage and frequency reading. If the
values in Index 2 are correct, perform the following steps.
1. Check if the phase sequence option DD-05-K is
installed. If accessory DD-05-K is installed and
there is a jumper across JP1-5, the phase sequence
option is installed.
2. If the phase sequence option is installed, press the
MENU arrow down key to check the phase
sequence in Index 1.
Emergency power must be
phased ABC
.
3. Check Menu Index 7 to verify proper sensing. A
single phase source should use single phase
sensing. If the source is three-phase and three
phase sensing is desired, the three-phase sensing
option, DD-05-K, must be installed. If this option is
not installed, single-phase sensing must be used.
If the source is available, the values in Index 2 are
correct, the phase sequence is correct, and the phase
sensing is correct, but the Source-Available, Emergency
LED is still not on, the status panel is bad. Replace the
logic board assembly.
If a value in Index 2 is incorrect, perform the steps below.
Incorrect Emergency Source Voltage
and Frequency Values
1. Use a voltmeter to measure the emergency source
voltage by connecting one test lead to TB-AC1-EA
and the other test lead to TB-AC1-EC. Note the
voltmeter reading. See Appendix B Figure B-9 for
location of TB-AC1 and other power supply board
components referred to in this section.
2. If the system is three-phase and three phase
sensing or phase rotation is desired, the option
DD-05-K must be installed. If it is installed, use a
voltmeter to measure the emergency source
voltage by connecting one test lead to TB-AC1-EA
and the other test lead to TB-AC1-EB. Note the
voltmeter reading. Connect one test lead to
TB-AC1-EB and the other test lead to TB-AC1-EC.
Note the voltmeter reading.
3. If the voltmeter did not display the expected
emergency source voltage in step 1 or step 2, check
the emergency source and the contactor to
assembly harness, P1.
4. If the voltage reading(s) in step 1 or step 2 did not
match the value(s) displayed in Index 2, check the
power supply board by performing the following
steps.
NOTE
When taking a voltage or resistance measurement
at a ribbon cable pin, do not disconnect the ribbon
cable from the board. Use a needle point probe to
take the readings from the holes on the top side of
the ribbon cable connector.
See Appendix B Figure B-6 for location and
description of P2 ribbon cable pins.
a. Using a voltmeter, connect one test lead to
P2-19 and the other to TB-DC1-34. The
