Description
Key Technical Specifications
-
Model Number: IS200ESYSH3ABB
-
Manufacturer: General Electric
-
Power Rails: 24 VDC ±10 % field input; on-board 5 V @ 3 A, ±12 V @ 1 A distributed to back-plane
-
Discrete I/O: 7 × 24 VDC opto-isolated auxiliary contact inputs; 2 × Form-C trip relay outputs (2 A, 250 VAC)
-
Connectors: 96-pin DIN to VME back-plane, three 12-position pluggable for field DI/relay, 4-pin power header
-
Isolation: 1500 Vrms field-to-logic, 500 V channel-to-channel
-
Protection: Input fuse 5 A, auto-reset thermal on ±12 V, MOV on 24 V rail
-
Diagnostics: Green “SYS OK,” red “TRIP” LEDs visible through bezel
-
Operating Temperature: –20 °C to +70 °C (conformal-coated)
-
Dimensions / Weight: 215 H × 169 D × 20 mm, 0.45 kg
.
DS3800NFEE1E1
Field Application & Problem Solved
In a Mark VI rack you don’t want a rat’s nest of power cables and random DI cards. The IS200ESYSH3ABB is the mother-board: it slides in, splits 24 VDC into logic rails, gives you seven contact inputs for breaker status, and two hard-wired trip relays that drop the fuel solenoid when the CPU says “trip.” Lose the card and you lose power to half the rack plus all contact status—unit folds to manual and you climb again. Swap it and you’re back online in five minutes, no re-cal required. Found in every Mark VI cabinet from 50 MW peakers to 400 MW combined-cycle blocks; its value is consolidation—one PCB replaces a power supply and two I/O cards, keeping the rack small and the wiring clean.
In a Mark VI rack you don’t want a rat’s nest of power cables and random DI cards. The IS200ESYSH3ABB is the mother-board: it slides in, splits 24 VDC into logic rails, gives you seven contact inputs for breaker status, and two hard-wired trip relays that drop the fuel solenoid when the CPU says “trip.” Lose the card and you lose power to half the rack plus all contact status—unit folds to manual and you climb again. Swap it and you’re back online in five minutes, no re-cal required. Found in every Mark VI cabinet from 50 MW peakers to 400 MW combined-cycle blocks; its value is consolidation—one PCB replaces a power supply and two I/O cards, keeping the rack small and the wiring clean.
Installation & Maintenance Pitfalls (Expert Tips)
24 V fuse fatigues—opens under vibration
The 5 A fuse is soldered pigtail-style. After ten years of turbine shake it opens under cold-start inrush. If you measure 0 V on the 5 V test jack but 28 V at the field terminals, cut the fuse out and drop in a panel-mount holder—five-cent part, five-minute fix.
The 5 A fuse is soldered pigtail-style. After ten years of turbine shake it opens under cold-start inrush. If you measure 0 V on the 5 V test jack but 28 V at the field terminals, cut the fuse out and drop in a panel-mount holder—five-cent part, five-minute fix.
Trip relay welded—fuel solenoid stays energized
The two Form-C relays are only rated 2 A. If the fuel-trip coil draws > 2 A inductive the contacts weld and the turbine can’t drop load on overspeed. Add an interposing relay or check the coil spec—otherwise you’ll be explaining to the insurance guy why the unit overshot 120 %.
The two Form-C relays are only rated 2 A. If the fuel-trip coil draws > 2 A inductive the contacts weld and the turbine can’t drop load on overspeed. Add an interposing relay or check the coil spec—otherwise you’ll be explaining to the insurance guy why the unit overshot 120 %.
Conformal coat cracked—salt fog kills the 5 V rail
The board is coated, but the 12-pin power header is masked. If the coat cracks, salt bridges 24 V to 5 V and you cook the logic. Scrape the salt, hit the header with 2100-FTG, and re-coat—problem gone for another decade.
The board is coated, but the 12-pin power header is masked. If the coat cracks, salt bridges 24 V to 5 V and you cook the logic. Scrape the salt, hit the header with 2100-FTG, and re-coat—problem gone for another decade.
DS3800NFEE1E1
Missing shoulder washers—card arcs to rack
The four corner holes are through-plated. Forget the fiber washers and the card edge sits 0.5 mm proud; 125 V battery finds the rack paint, arcs, and blows a hole in the ground plane. Use the original GE shoulder washers—torque to 8 in-lb, no more.
The four corner holes are through-plated. Forget the fiber washers and the card edge sits 0.5 mm proud; 125 V battery finds the rack paint, arcs, and blows a hole in the ground plane. Use the original GE shoulder washers—torque to 8 in-lb, no more.
Technical Deep Dive & Overview
IS200ESYSH3ABB is a passive mother-board frozen in 2000 silicon. A 5 V switching regulator and 7812/7912 TO-220s create logic rails; seven opto-couplers debounce 24 V contacts; two Form-C relays give hard-wired trip paths that bypass the CPU. Because the card carries both power and contact signals you can swap it hot—just kill the 24 VDC field supply first or you’ll arc-weld the 12-pin plug. Treat the 24 V input like a battery bus and the board will keep the Mark VI alive for another thirty years
IS200ESYSH3ABB is a passive mother-board frozen in 2000 silicon. A 5 V switching regulator and 7812/7912 TO-220s create logic rails; seven opto-couplers debounce 24 V contacts; two Form-C relays give hard-wired trip paths that bypass the CPU. Because the card carries both power and contact signals you can swap it hot—just kill the 24 VDC field supply first or you’ll arc-weld the 12-pin plug. Treat the 24 V input like a battery bus and the board will keep the Mark VI alive for another thirty years
.
