KEPCO KDA 24V Alarm Module - Manual (Page 7)

KEPCO, INC. 131-38 SANFORD AVENUE FLUSHING, NY. 11355 U.S.A. TEL (718) 461-7000 FAX (718) 767-1102
http://www.kepcopower.com email: [email protected]
062411 228-1694 REV 4
7
6. Verify that this toggle point is the desired value for UVP
voltage. If this voltage is not correct, proceed to step 7
for fine tuning. If this voltage is correct, slowly lower the
variable power supply voltage and verify that value of
UVD (V1, Figure 5) is adequate (Hysteresis value 0.6V
typ. see Figure 5)
7. If the toggle point is missed, fine tune as follows: Adjust
power supply voltage to the desired UVP value (Under-
voltage pick-up voltage). Turn the LOW trimpot CW
about two to three turns until the system toggles back
again (yellow UV light on, DC OK light off, relay deen-
ergized). Very slowly turn LOW trimpot CCW until the
toggle point is reached: yellow UV light goes out, green
DC OK light goes on, and the relay energizes. Reverify
again per step 6.
High Alarm (Overvoltage) Adjustment. If the fac-
tory adjusted values are not acceptable, proceed as follows
to adjust the high alarm pick-up and drop-off voltages (V3
and V4 of Figure 5). See Table 2 for the adjustment range
NOTE: Once all LOW and HIGH alarm adjustments are
complete, refer to “Securing Alarm Adjustments”
on page 7 to secure the adjustments.
1. Connect the variable power supply described above to
the channel input as described in the paragraph titled
“Input Connections.” on page 5. Toggle voltage points
may be monitored using the visual indicators (yellow
UV, green DC OK and red OV lights) or monitoring the
relay contacts.
2. Turn the HIGH trimpot fully CW, then adjust the power
supply to the desired HIGH threshold voltage (OVP, V4
shown in Figure 5). If necessary, use a DVM to monitor
the power supply voltage.
3. Observe that the green DC OK light is lit and relay is
deenergized. Slowly (approximately one complete turn
in five seconds) turn the HIGH trim pot CCW until the
toggle point (red OV LED goes on, no other lights are
lit and the relay deenergizes.
4. To verify the settings lower the voltage of the variable
power supply by about 2V. Observe that the green DC
OK light is lit, relay is deenergized and red OV LED is
off.
5. Slowly increase the voltage until the toggle point
occurs (red OV LED goes on, no other lights are lit and
the relay deenergizes.
6. Verify that this toggle point is the desired value for OVP
voltage. If this voltage is not correct, proceed to step 7
for fine tuning. If this voltage is correct, slowly lower the
variable power supply voltage and verify that value of
OVD (V3, Figure 5) is adequate (Hysteresis value 0.9V
typ. see Figure 5)
7. If the toggle point is missed, fine tune as follows: Adjust
power supply voltage to the desired OVP value (Over-
voltage pick-up voltage). Turn the HIGH trimpot CW
about two or three turns until the system toggles back
again (green DC OK light is lit, relay is deenergized
and red OV LED is off). Very slowly turn HIGH trimpot
CCW until the toggle point is reached: red OV LED
goes on, no other lights are lit and the relay deener-
gizes. Reverify again per step 6.
Securing Alarm Adjustments. Once HIGH and LOW
alarm settings for both channels are acceptable, the adjust-
ments can be covered to prevent tampering by installing
four plugs (supplied) into the trimpot adjustment access
holes (see Figure 7). Once these plugs have been
installed, they can only be removed by first removing the
KDA cover (remove two screws and slide cover off) and
then releasing the plug prongs while pushing the plug out.