Holtgreven GSE-355 I.S. - Manual (Page 46)

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Figure 28: Model 350/355 Main Board Battery Connection
ON/OFF S
WITCH
The on/off switch for the Model 350 die cast is a rocker-type switch that mounts in the center rectangular hole punch-
out. The on/off switch for the Model 350/355 stainless is a toggle-type (washdown type) switch that replaces one of
the available enclosure strain reliefs. The switch is soldered to the board (diecast) or on a cable (stainless).
The Model 350/355 will immediately switch to battery operation when AC power is interrupted if the switch is in the
ON position. Placing the switch in the OFF position prevents the battery from running down when AC power is
removed. The battery will be charged whenever there is AC power to the Model 350/355, regardless of the switch
position.
I
NSTALLING THE
O
N
/O
FF
S
WITCH ON
O
LDER
M
ODEL
350/355 S
TAINLESS
S
TEEL
I
NDICATORS
The 24350B-121B0 kit included a stainless steel washer and a rubber washer to allow mounting of the ON/OFF switch
in 44-25-34840 revision.
A stainless steel enclosures. The switch was mounted in one of the holes for a PG9 size strain relief. The washers were
used because the switch barrel diameter was much smaller than the hole diameter. The revision B enclosures have a
PG7 size strain relief hole which allows mounting of the switch without the washers. Current Model 350/355
production has switched to the revision B enclosures. The washers are not included in the version 2 option kits for this
reason. If you are retrofitting an older Model 350/355 Stainless Steel Indicator, please contact your sales representative
to get one each of the following GSE part numbers:
• 36-20-2450 Rubber washer, 0.49 ID x 1.06 OD x 0.093 thick
• 36-20-2455 Stainless washer, 0.5 ID x 1.125 OD x 0.062 thick
B
ATTERY
C
HARGING
If needed, the battery will always be charging when the unit is plugged in, regardless of the switch position. Typically,
it takes four hours to fast charge a fully discharged battery.
Battery voltage is monitored to provide a fast charge then a continuous trickle charge to maintain the battery while not
in use.
O
VERCHARGE
P
ROTECTION
The battery state is monitored by the charging circuit to prevent overcharge and provide proper charge termination.
Overcharging is also prevented through temperature sensing.
Battery voltage is monitored during charging to ensure a 100 percent capacity charge. The circuitry includes a safety
timer to stop battery fast charging after 264 minutes.