Section VII
Trouble-Shooting Guide
006-0006885 08/14/18
Rev H
44 of 48
MINV-4000-1U-28 Guide www.synqor.com
Two other conditions should be mentioned:
• The fans are off when the MINV is running
It is normal for the fans to be off, even if the MINV is running and delivering power to the load,
as long as the temperature of the MINV is low enough. If the Fan Service Required LED (C0) is
green, both of the fans are OK, even if they are not running.
•
The MINV does not turn off when the ON/OFF switch is pushed down
When the ON/OFF switch on the front panel is pushed down, the MINV does not respond to
this signal for approximately 1 second. This is done to ensure that the MINV is not accidently
turned off. If the user does not hold the ON/OFF switch in the OFF position for a full second
before releasing it, the MINV will not turn off.
Other possible situations that are the result of external issues that a user could
likely correct are related to:
• Cable wire resistance is too high:
As mentioned in the section “Power Cable Wire Size,” the resistance of a power cable’s wires
gives a voltage drop from the upstream to the downstream end of the cable. This voltage drop,
if large enough, will cause the MINV to determine that the voltage at its DC INPUT is below its
minimum specified value, even though the corresponding voltage at the source of DC power
is within the specified range.
This problem is particularly possible for the MINV system, since the DC INPUT current is so
high (as much as 240 A at full power) and the DC INPUT voltage is so low (as low as 20 V).
This phenomenon that may be displayed is the following:
▪ The MINV, before it turns on, does not draw any power or current from the DC INPUT, and
therefore the voltage drop across the DC INPUT cable is zero.
▪ The MINV sees that the voltage at the DC INPUT is within its specified range, and enables
its outputs.
▪ As the load then draws power, the MINV begins to draw current from the DC INPUT cable.
This current causes a voltage drop to appear across the table.
▪ If the voltage drop at the DC source is close to, but still above, its 20 V minimum, but the
voltage drop across the cable is large enough for the voltage at the DC INPUT of the MINV
to fall below 20 V, then the MINV may determine that the DC INPUT is out of range and
shut down.
