Description
ABB PSR25-600-70
- Technical Specifications:
- Rated Operational Current (Ie): 25 A (AC-53a/53b)
- Max Motor Power: @400 V ≈11 kW (AC-3 equivalent); @500 V ≈15 kW (check ABB selection table — depends on ambient & duty)
- Line Voltage Range: 208–600 V AC ±10 % (3-phase)
- Control Supply Voltage: 200–240 V AC 50/60 Hz (suffix -70); other versions: -21 = 24 V DC, -01 = 100–120 V AC
- Start / Stop Ramp Time: 0.5–60 s (adjustable via trimpots or keypad if PKP-21 display module fitted)
- Initial Voltage (Kick-start): 30–70 % of line voltage (adjustable)
- Bypass: Built-in electromagnetic bypass contacts (close after ramp-up; open before ramp-down)
- Protection: Overload not included — requires external motor protection relay (e.g., EF19 / manual motor protector / electronic OLR) or use ABB PSRC with built-in protection
- Indicators: Power (green), Run (green), Fault (red — overload/triac fault if option)
- Mounting: DIN rail 35 mm (EN 60715) or screw-mount via flange
- Dimensions: ≈45 mm (W) × 115 mm (H) × 130 mm (D)
- Operating Temp.: –25 °C to +50 °C (derate above +40 °C)
- Certifications: CE, UL, cUL, CSA, CCC, EAC
- Functional Features:
- Soft start (voltage ramp) & soft stop (ramp-down) — reduces water hammer in pumps, belt stress in conveyors
- Built-in bypass → energy saving & no heatsink fan needed for most applications ≤25 A
- Pump-stop function (controlled deceleration) to minimize surge in piping
- Compatible with ABB PKP-21 external keypad/display for setup & diagnostics (optional)
- Triac failure detection (some versions) — alerts if SCR shorted
- Application Scenarios:
- Small pump (circulating, booster) — soft start to reduce water hammer
- Conveyor / agitator — gentle acceleration to prevent product spill / belt jerk
- Compressor (light start torque <40 % FLT) — check start torque requirement; PSR ok for low-inertia starts
- Retrofit of direct-on-line starter where inrush current or mechanical shock is problematic
- Material & Structure:
- Housing: Gray polyamide (PA66), UL 94 V-0; aluminum heat-sink fins (for start transient dissipation)
- Terminals: Screw (M4/M5) — line (L1/L2/L3) & motor (T1/T2/T3); control terminals spring-cage or screw
- Bypass contactor: Silver alloy (AgCdO / AgSnO₂) — rated for motor FLC
- Working Principle:
During start command, the thyristors are gated with increasing firing angle → motor terminal voltage ramps from initial voltage (kick-start %) to full line voltage over set ramp time → when full voltage reached, built-in bypass contactor closes → thyristors stop conducting (no dissipation). On stop command, bypass opens → thyristors ramp voltage down over stop-ramp time → motor coasts/decels. If external overload trips, starter is inhibited from restarting.
- Installation Requirements:
- Mount on DIN rail with ≥50 mm above/below for airflow (heatsink)
- Wire L1/L2/L3 from line; T1/T2/T3 to motor; earth motor frame & PSR PE terminal
- Connect control supply (230 V AC for -70 version) to A1/A2; connect Start/Stop contacts (NO Start, NC Stop) to run/stop terminals — typical 2-wire or 3-wire control selectable via DIP or wiring
- Set start ramp, initial voltage via trimmers (or PKP-21 if fitted)
- Verify motor FLC ≤25 A & start torque adequate — if heavy start torque (>40 % FLT) consider PST(B) series
- Install upstream motor overload protection (separate OLR / MCP) — PSR does NOT contain thermal overload
- Precautions:
- PSR25 is NOT a motor protection device — you MUST provide short-circuit protection (MCCB/fuse) and overload protection (OLR or electronic) upstream/downstream
- For high-inertia loads (centrifuges, large fans) start current duration may exceed thyristor rating — check I²t & starting time against PSR capability — may need PST(B) series
- Do NOT use for plugging / reversing duty — thyristors not rated for reverse braking
- Ensure control voltage matches nameplate — applying 400 V AC to 230 V control fries coil instantly
- Bypass contactor clicks audibly at end of start — if no click, check control wiring & start signal
